#!/usr/bin/env python3
"""prop_author.py — the park object catalog. Every prop is parametric, textured
with the MODELBEAST surface set, and ships manifest metadata the skatemakerpro
editor can consume directly:

  src       props/<id>.glb           (editor prop `src` field)
  grinds    local-space rail segments {a,b,ya,yb,kind} — translate/rotate with
            the prop and append to the park's rails list
  element   a matching terrain-kind hint for ramps (quarter/bank/funbox/spine)
            so placed ramps get real collision from the editor's heightfield
  collider  simple blocker hint for furniture/trees

Origin: ground centre. Metres, Y up. Ramps face +z (rider approaches from +z).
Run: python3 tools/prop_author.py     -> props/*.glb + manifest.json
"""
import json, math, os, sys
sys.path.insert(0, os.path.dirname(__file__))
from propkit import (Mat, Prop, box, sheet, lathe, tube, blob, merge, translate,
                     rotate_y, scale, compute_normals, _p)

ROOT = os.path.join(os.path.dirname(__file__), '..')
PROPS = os.path.join(ROOT, 'props')
TEX = os.path.join(ROOT, 'textures')

# ---------------------------------------------------------------- materials
CONC   = Mat('concrete',       tex='concrete_smooth', uv=1.6)
CONC_R = Mat('concrete_rough', tex='concrete_rough',  uv=1.4)
PLY    = Mat('plywood',        tex='plywood_ramp',    uv=1.2)
GALV   = Mat('galv',           tex='steel_galv',      uv=0.8,  rough=0.5,  metal=0.85)
STEEL  = Mat('steel_worn',     tex='steel_scratch',   uv=0.45, rough=0.35, metal=0.9)
SLATS  = Mat('slats',          tex='wood_slats',      uv=0.9)
BARKF  = Mat('bark_fig',       tex='bark_fig',        uv=1.1)
BARKG  = Mat('bark_gum',       tex='bark_gum',        uv=1.2)
LEAFF  = Mat('leaves_fig',     tex='leaves_fig',      uv=1.6, double=True)
LEAFG  = Mat('leaves_gum',     tex='leaves_gum',      uv=1.4, double=True,
             tint=(0.78, 0.9, 0.7, 1))     # push the pale crown toward sage
DIRT   = Mat('dirt',           tex='dirt_mulch',      uv=1.0)
BRICK  = Mat('brick',          tex='brick_qld',       uv=1.2)
TARMAC = Mat('tarmac',         tex='tarmac',          uv=1.5)
GRAF_A = Mat('graffiti_a',     tex='graffiti_a',      uv=1.0)   # uv_fit parts only
GRAF_B = Mat('graffiti_b',     tex='graffiti_b',      uv=1.0)
BIN_G  = Mat('bin_green', tint=(0.13, 0.28, 0.16, 1), rough=0.7)
SAIL   = Mat('sail', tint=(0.75, 0.42, 0.28, 1), rough=0.85, double=True)

# ---------------------------------------------------------------- helpers
def uv_fit(part, u0=0.0, v0=0.0, u1=1.0, v1=1.0):
    """Remap a part's UVs to [u0..u1]x[v0..v1] — for decal faces (graffiti)."""
    us = [u for u, v in part['UV']]; vs = [v for u, v in part['UV']]
    du = (max(us) - min(us)) or 1; dv = (max(vs) - min(vs)) or 1
    part['UV'] = [(u0 + (u - min(us)) / du * (u1 - u0),
                   v0 + (v - min(vs)) / dv * (v1 - v0)) for u, v in part['UV']]
    return part

def quad(a, b, c, d):
    """Single quad a->b->c->d ccw, UV 0..1."""
    P = [a, b, c, d]
    I = [0, 1, 2, 0, 2, 3]
    N = compute_normals(P, I)
    return _p(P, N, [(0, 0), (1, 0), (1, 1), (0, 1)], I)

def fan(pts, uvf, out=None):
    """Triangle fan from pts[0] over a planar boundary. uvf(p) -> (u, v).
    out: desired outward normal — winding auto-reverses to face it (no more
    hand-reasoning CCW per plate; qp_24 shipped invisible the first time)."""
    P = list(pts)
    I = []
    for i in range(1, len(pts) - 1):
        I += [0, i, i + 1]
    N = compute_normals(P, I)
    if out is not None:
        d = sum(n[k] * out[k] for n in N for k in range(3))
        if d < 0:
            I = [I[i + o] for i in range(0, len(I), 3) for o in (0, 2, 1)]
            N = [(-x, -y, -z) for x, y, z in N]
    return _p(P, N, [uvf(p) for p in P], I)

def angle_cap(x0, x1, y, z, t=0.05, th=0.008):
    """Steel L-angle capping a ledge top edge running along x at (y, z)."""
    horiz = box((x0 + x1) / 2, y - th / 2, z, x1 - x0, th, t)
    vert = box((x0 + x1) / 2, y - t / 2, z + (t / 2 if z >= 0 else -t / 2),
               x1 - x0, t, th)
    return merge(horiz, vert)

def arc_pts(r, th0, th1, n):
    return [(r - r * math.cos(t), -r * math.sin(t))
            for t in [th0 + (th1 - th0) * i / n for i in range(n + 1)]]

# =================================================================== ramps
def quarter(pid, w, h, r, desc, coping=True, deck=True, mat=None):
    mat = mat or PLY
    th = math.acos(1 - h / r)
    depth = r * math.sin(th)
    n = 14
    ys_zs = [(r - r * math.cos(t), -r * math.sin(t))
             for t in [th * i / n for i in range(n + 1)]]
    p = Prop(pid, 'obstacle', desc)
    # riding surface (two columns across width)
    rows = [[(-w / 2, y, z), (w / 2, y, z)] for y, z in ys_zs]
    p.add(mat, sheet(rows))
    # deck platform + coping
    deck_d = 0.6 if deck else 0.12
    if deck:
        p.add(mat, box(0, h - 0.04, -depth - deck_d / 2, w, 0.08, deck_d))
    if coping:
        p.add(STEEL, tube([(-w / 2, h + 0.02, -depth), (w / 2, h + 0.02, -depth)],
                          0.032, seg=10))
    # side plates: arc boundary + deck + back-down (fan from back-bottom corner)
    prof = [( -depth - deck_d, 0)] + [(z, y) for y, z in ys_zs] + \
           [(-depth, h), (-depth - deck_d, h)]
    for sx in (-w / 2, w / 2):
        pts = [(sx, y, z) for z, y in prof]
        p.add(mat, fan(pts, lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    # back wall
    p.add(GALV, box(0, h / 2, -depth - deck_d + 0.02, w, h, 0.04))
    if coping:
        p.grind(-w / 2, -depth, w / 2, -depth, h + 0.02, h + 0.02, 'rail')
    else:
        p.grind(-w / 2, -depth, w / 2, -depth, h, h, 'ledge')
    p.element = {'kind': 'quarter', 'len': w, 'r0': r, 'r1': r, 'h': h}
    return p

def bank(pid, w, h, run, desc):
    p = Prop(pid, 'obstacle', desc)
    rows = [[(-w / 2, 0, run), (w / 2, 0, run)], [(-w / 2, h, 0), (w / 2, h, 0)]]
    p.add(PLY, sheet(rows))
    p.add(PLY, box(0, h - 0.02, -0.2, w, 0.04, 0.4))        # top plate
    for sx in (-w / 2, w / 2):
        p.add(PLY, fan([(sx, 0, -0.4), (sx, 0, run), (sx, h, 0), (sx, h, -0.4)],
                       lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.add(GALV, box(0, h / 2, -0.38, w, h, 0.04))
    p.add(STEEL, angle_cap(-w / 2, w / 2, h, 0))
    p.grind(-w / 2, 0, w / 2, 0, h, h, 'ledge')
    p.element = {'kind': 'bank', 'len': w, 'h': h, 'run': run}
    return p

def kicker(pid='kicker', w=1.2, h=0.45, run=1.0,
           desc='curved plywood launch kicker'):
    p = Prop(pid, 'obstacle', desc)
    n = 8
    rows = []
    for i in range(n + 1):
        t = i / n
        y = h * t * t                      # quadratic curve
        z = run * (1 - t)
        rows.append([(-w / 2, y, z), (w / 2, y, z)])
    p.add(PLY, sheet(rows))
    for sx in (-w / 2, w / 2):
        pts = [(sx, 0, run)] + [(sx, h * (i / n) ** 2, run * (1 - i / n)) for i in range(1, n + 1)] + [(sx, 0, 0)]
        p.add(PLY, fan(pts, lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.add(GALV, box(0, h / 2, -0.02, w, h, 0.04))
    p.add(STEEL, box(0, h - 0.005, 0.02, w, 0.01, 0.06))    # lip strip
    p.element = {'kind': 'bank', 'len': w, 'h': h, 'run': run}
    return p

def funbox_ply():
    p = Prop('funbox_ply', 'obstacle', 'plywood funbox, banks both sides, steel edge caps')
    w, d, h, skirt = 2.4, 1.2, 0.6, 1.0
    p.add(PLY, box(0, h - 0.04, 0, w, 0.08, d))             # top
    for sz in (1, -1):                                       # bank skirts
        rows = [[(-w / 2, 0, sz * (d / 2 + skirt)), (w / 2, 0, sz * (d / 2 + skirt))],
                [(-w / 2, h, sz * d / 2), (w / 2, h, sz * d / 2)]]
        p.add(PLY, sheet(rows, flip=(sz < 0)))
        p.add(STEEL, angle_cap(-w / 2, w / 2, h, sz * d / 2))
        p.grind(-w / 2, sz * d / 2, w / 2, sz * d / 2, h, h, 'ledge')
    for sx in (-w / 2, w / 2):                               # side triangles
        p.add(GALV, fan([(sx, 0, -(d / 2 + skirt)), (sx, 0, d / 2 + skirt),
                         (sx, h, d / 2), (sx, h, -d / 2)],
                        lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.element = {'kind': 'funbox', 'hw': w / 2, 'hd': d / 2, 'h': h, 'skirt': skirt}
    return p

def spine_ply():
    p = Prop('spine_ply', 'obstacle', 'plywood spine, double coping')
    w, h, r = 2.4, 0.9, 1.35
    th = math.acos(1 - h / r)
    depth = r * math.sin(th)
    n = 12
    for sz in (1, -1):
        arc = [(r - r * math.cos(t), r * math.sin(th) - r * math.sin(t))
               for t in [th * i / n for i in range(n + 1)]]
        rows = [[(-w / 2, y, sz * (z + 0.1)), (w / 2, y, sz * (z + 0.1))] for y, z in arc]
        p.add(PLY, sheet(rows, flip=(sz < 0)))
        p.add(STEEL, tube([(-w / 2, h + 0.02, sz * 0.1), (w / 2, h + 0.02, sz * 0.1)],
                          0.032, seg=10))
        p.grind(-w / 2, sz * 0.1, w / 2, sz * 0.1, h + 0.02, h + 0.02, 'rail')
    p.add(PLY, box(0, h - 0.01, 0, w, 0.02, 0.2))            # spine cap between copings
    for sx in (-w / 2, w / 2):                               # side plates
        arc = [(r - r * math.cos(t), r * math.sin(th) - r * math.sin(t))
               for t in [th * i / n for i in range(n + 1)]]
        pts = [(sx, y, z + 0.1) for y, z in arc] + \
              [(sx, y, -(z + 0.1)) for y, z in reversed(arc)]
        p.add(PLY, fan(pts, lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.element = {'kind': 'spine', 'len': w, 'r': r, 'h': h}
    return p

def manual_pad():
    p = Prop('manual_pad', 'obstacle', 'low concrete manual pad, steel edges')
    w, d, h = 2.0, 1.6, 0.28
    p.add(CONC, box(0, h / 2, 0, w, h, d))
    for sz in (1, -1):
        p.add(STEEL, angle_cap(-w / 2, w / 2, h, sz * d / 2))
        p.grind(-w / 2, sz * d / 2, w / 2, sz * d / 2, h, h, 'ledge')
    p.element = {'kind': 'funbox', 'hw': w / 2, 'hd': d / 2, 'h': h, 'skirt': 0.3}
    return p

def ledge_concrete():
    p = Prop('ledge_concrete', 'obstacle', 'concrete grind ledge, tagged side')
    w, d, h = 2.4, 0.45, 0.42
    p.add(CONC, box(0, h / 2, 0, w, h, d))
    side = uv_fit(quad((-w / 2, 0, d / 2 + 0.002), (w / 2, 0, d / 2 + 0.002),
                       (w / 2, h, d / 2 + 0.002), (-w / 2, h, d / 2 + 0.002)))
    p.add(GRAF_B, side)
    for sz in (1, -1):
        p.add(STEEL, angle_cap(-w / 2, w / 2, h, sz * d / 2))
        p.grind(-w / 2, sz * d / 2, w / 2, sz * d / 2, h, h, 'ledge')
    p.collider = {'type': 'box', 'hw': w / 2, 'hd': d / 2, 'h': h}
    p.element = {'kind': 'ledge', 'hw': w / 2, 'hd': d / 2, 'h': h}
    return p

def grindbox_ply():
    p = Prop('grindbox_ply', 'obstacle', 'plywood grindbox: round bar one edge, angle the other')
    w, d, h = 1.8, 0.5, 0.4
    p.add(PLY, box(0, h / 2, 0, w, h, d))
    p.add(STEEL, tube([(-w / 2, h + 0.024, d / 2), (w / 2, h + 0.024, d / 2)], 0.024, seg=8))
    p.grind(-w / 2, d / 2, w / 2, d / 2, h + 0.024, h + 0.024, 'rail')
    p.add(STEEL, angle_cap(-w / 2, w / 2, h, -d / 2))
    p.grind(-w / 2, -d / 2, w / 2, -d / 2, h, h, 'ledge')
    p.element = {'kind': 'ledge', 'hw': w / 2, 'hd': d / 2, 'h': h}
    return p

# =================================================================== rails
def flat_rail(pid, length, h, feet, desc):
    p = Prop(pid, 'obstacle', desc)
    r = 0.021
    p.add(STEEL, tube([(-length / 2, h, 0), (length / 2, h, 0)], r, seg=10))
    for i in range(feet):
        fx = -length / 2 + 0.25 + (length - 0.5) * (i / max(1, feet - 1))
        p.add(GALV, tube([(fx, 0, 0), (fx, h - r, 0)], 0.018, seg=8))
        p.add(GALV, box(fx, 0.006, 0, 0.16, 0.012, 0.12))
    p.grind(-length / 2, 0, length / 2, 0, h, h, 'rail')
    p.collider = {'type': 'none'}                    # thin — ride under is fine
    return p

def rail_kink():
    p = Prop('rail_kink', 'obstacle', 'kinked down rail: flat then slope')
    h1, h2 = 0.55, 0.10
    pts = [(-1.6, h1, 0), (0.2, h1, 0), (1.6, h2, 0)]
    p.add(STEEL, tube(pts, 0.021, seg=10))
    for fx, fy in ((-1.35, h1), (0.1, h1), (1.45, h2 + 0.06)):
        p.add(GALV, tube([(fx, 0, 0), (fx, fy - 0.02, 0)], 0.018, seg=8))
        p.add(GALV, box(fx, 0.006, 0, 0.16, 0.012, 0.12))
    p.grind(-1.6, 0, 0.2, 0, h1, h1, 'rail')
    p.grind(0.2, 0, 1.6, 0, h1, h2, 'rail')
    p.collider = {'type': 'none'}
    return p

def rail_rainbow():
    p = Prop('rail_rainbow', 'obstacle', 'rainbow rail arc')
    span, peak, n = 3.2, 0.8, 10
    pts = []
    for i in range(n + 1):
        t = i / n
        x = -span / 2 + span * t
        y = 0.06 + (peak - 0.06) * math.sin(math.pi * t)
        pts.append((x, y, 0))
    p.add(STEEL, tube(pts, 0.021, seg=10))
    for sx in (-span / 2, span / 2):
        p.add(GALV, box(sx, 0.03, 0, 0.2, 0.06, 0.14))
    p.grind(-span / 2, 0, 0, 0, 0.06, peak, 'rail')
    p.grind(0, 0, span / 2, 0, peak, 0.06, 'rail')
    p.collider = {'type': 'none'}
    return p

def pipe_full():
    p = Prop('pipe_full', 'obstacle', 'concrete full pipe, graffiti bombed outside')
    ri, ro, L, seg = 1.75, 1.9, 3.0, 24
    cy = ri                                           # inner floor kisses ground
    def ring(rr):
        return [(math.cos(2 * math.pi * i / seg) * rr,
                 cy + math.sin(2 * math.pi * i / seg) * rr) for i in range(seg + 1)]
    inner = sheet([[(-L / 2, y, x), (L / 2, y, x)] for x, y in ring(ri)], flip=True)
    outer = sheet([[(-L / 2, y, x), (L / 2, y, x)] for x, y in ring(ro)])
    p.add(CONC, inner)
    p.add(Mat('graffiti_wrap', tex='graffiti_a', uv=3.5), outer)   # murals round the girth
    for sx in (-1, 1):                                # end rings
        P, N, UV, I = [], [], [], []
        for i in range(seg + 1):
            a = 2 * math.pi * i / seg
            P += [(sx * L / 2, cy + math.sin(a) * ri, math.cos(a) * ri),
                  (sx * L / 2, cy + math.sin(a) * ro, math.cos(a) * ro)]
            N += [(sx, 0, 0)] * 2
            UV += [(math.cos(a) * ri, cy + math.sin(a) * ri),
                   (math.cos(a) * ro, cy + math.sin(a) * ro)]
        for i in range(seg):
            b = i * 2
            tri = [b, b + 2, b + 1, b + 1, b + 2, b + 3]
            if sx < 0: tri = [b, b + 1, b + 2, b + 1, b + 3, b + 2]
            I += tri
        p.add(CONC_R, _p(P, N, UV, I))
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': ro, 'h': 2 * ro}
    return p

# ================================================================ furniture
def bench_park():
    p = Prop('bench_park', 'furniture', 'timber slat park bench, steel frame')
    L, seat_h, seat_d = 1.8, 0.45, 0.5
    for i in range(5):                                # seat slats
        z = -seat_d / 2 + 0.05 + i * 0.1
        p.add(SLATS, box(0, seat_h - 0.02, z, L, 0.04, 0.085))
    for i in range(2):                                # back slats
        y = 0.62 + i * 0.13
        p.add(SLATS, box(0, y, -seat_d / 2 - 0.05 - (y - seat_h) * 0.25, L, 0.1, 0.04))
    for sx in (-L / 2 + 0.12, L / 2 - 0.12):          # steel loop legs
        p.add(GALV, tube([(sx, 0, seat_d / 2 - 0.04), (sx, seat_h - 0.04, seat_d / 2 - 0.06),
                          (sx, seat_h - 0.04, -seat_d / 2 + 0.02),
                          (sx, 0.86, -seat_d / 2 - 0.11)], 0.02, seg=8))
        p.add(GALV, tube([(sx, 0.02, seat_d / 2 - 0.04), (sx, 0.02, -seat_d / 2 + 0.02)],
                         0.018, seg=8))
    p.grind(-L / 2, seat_d / 2, L / 2, seat_d / 2, seat_h, seat_h, 'ledge')
    p.grind(-L / 2, -seat_d / 2 - 0.11, L / 2, -seat_d / 2 - 0.11, 0.86, 0.86, 'rail')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': 0.35, 'h': seat_h}
    return p

def bench_concrete():
    p = Prop('bench_concrete', 'furniture', 'concrete bench block, tagged')
    L, h, d = 1.8, 0.45, 0.45
    p.add(CONC, box(0, h / 2, 0, L, h, d))
    p.add(GRAF_B, uv_fit(quad((-L / 2, 0, d / 2 + 0.002), (L / 2, 0, d / 2 + 0.002),
                              (L / 2, h, d / 2 + 0.002), (-L / 2, h, d / 2 + 0.002))))
    for sz in (1, -1):
        p.grind(-L / 2, sz * d / 2, L / 2, sz * d / 2, h, h, 'ledge')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': d / 2, 'h': h}
    p.element = {'kind': 'ledge', 'hw': L / 2, 'hd': d / 2, 'h': h}
    return p

def picnic_table():
    p = Prop('picnic_table', 'furniture', 'timber A-frame picnic table')
    L, top_h, seat_h = 1.8, 0.78, 0.45
    for i in range(4):                                # tabletop planks
        p.add(SLATS, box(0, top_h - 0.025, -0.3 + i * 0.2, L, 0.05, 0.18))
    for sz in (1, -1):                                # seats
        for i in range(2):
            p.add(SLATS, box(0, seat_h - 0.025, sz * (0.62 + 0.0) + (i - 0.5) * 0.16 * sz * 0 + sz * (i * 0.16 - 0.08), L, 0.05, 0.14))
    for sx in (-L / 2 + 0.2, L / 2 - 0.2):            # A-frame legs
        p.add(SLATS, box(sx, top_h / 2, 0.55, 0.09, 0.05, 2.0))
        for sz in (1, -1):
            leg = tube([(sx, 0, sz * 0.72), (sx, top_h - 0.05, sz * 0.28)], 0.032, seg=6)
            p.add(SLATS, leg)
        p.add(SLATS, box(sx, seat_h - 0.06, 0, 0.09, 0.05, 1.55))
    for sz in (1, -1):
        p.grind(-L / 2, sz * 0.4, L / 2, sz * 0.4, top_h, top_h, 'ledge')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': 0.85, 'h': top_h}
    return p

def bin_council():
    p = Prop('bin_council', 'furniture', 'council park bin, dark green')
    prof = [(0.26, 0.0), (0.28, 0.05), (0.28, 0.75), (0.30, 0.8),
            (0.30, 0.92), (0.22, 1.0), (0.10, 1.02), (0.0, 1.02)]
    p.add(BIN_G, lathe(prof, seg=14))
    p.add(GALV, lathe([(0.30, 0.78), (0.305, 0.8), (0.30, 0.82)], seg=14,
                      cap_top=False))
    p.collider = {'type': 'cylinder', 'r': 0.32, 'h': 1.02}
    return p

def bollard_steel():
    p = Prop('bollard_steel', 'furniture', 'galvanised bollard')
    p.add(GALV, lathe([(0.08, 0.0), (0.08, 0.82), (0.075, 0.88), (0.04, 0.92), (0.0, 0.93)],
                      seg=12))
    p.collider = {'type': 'cylinder', 'r': 0.1, 'h': 0.93}
    return p

def railing_ped():
    p = Prop('railing_ped_2m', 'furniture', 'pedestrian railing, 2m module')
    L, H = 2.0, 1.0
    p.add(GALV, tube([(-L / 2, H, 0), (L / 2, H, 0)], 0.024, seg=8))
    p.add(GALV, tube([(-L / 2, 0.55, 0), (L / 2, 0.55, 0)], 0.018, seg=8))
    for sx in (-L / 2 + 0.05, L / 2 - 0.05):
        p.add(GALV, tube([(sx, 0, 0), (sx, H - 0.02, 0)], 0.024, seg=8))
        p.add(GALV, box(sx, 0.006, 0, 0.14, 0.012, 0.14))
    p.grind(-L / 2, 0, L / 2, 0, H, H, 'rail')
    p.collider = {'type': 'none'}
    return p

def planter_box():
    p = Prop('planter_box', 'furniture', 'brick planter, concrete cap, gum sapling')
    L, D, H = 1.2, 0.5, 0.5
    p.add(BRICK, box(0, (H - 0.06) / 2, 0, L, H - 0.06, D))
    p.add(CONC, box(0, H - 0.03, 0, L + 0.08, 0.06, D + 0.08))
    p.add(DIRT, box(0, H - 0.055, 0, L - 0.12, 0.02, D - 0.12))
    p.add(BARKG, tube([(0.1, H, 0), (0.05, H + 0.9, 0.05)], 0.035, seg=6))
    p.add(LEAFG, translate(blob(0.45, 0.4, 0.45, seg=8, rings=5, amp=0.22, seed=3.0),
                           0.02, H + 1.05, 0.04))
    for sz in (1, -1):
        p.grind(-L / 2 - 0.04, sz * (D / 2 + 0.04), L / 2 + 0.04, sz * (D / 2 + 0.04),
                H, H, 'ledge')
    p.collider = {'type': 'box', 'hw': L / 2 + 0.04, 'hd': D / 2 + 0.04, 'h': H}
    return p

def kerb_3m():
    p = Prop('kerb_3m', 'dressing', 'kerb + gutter strip — slappy central')
    L, kh = 3.0, 0.15
    p.add(TARMAC, box(0, 0.005, 0.45, L, 0.01, 0.9))          # road gutter
    p.add(CONC_R, box(0, kh / 2, -0.075, L, kh, 0.15))        # kerb stone
    p.add(CONC_R, box(0, kh - 0.005, -0.45, L, 0.01, 0.6))    # footpath strip
    p.grind(-L / 2, 0, L / 2, 0, kh, kh, 'ledge')
    p.collider = {'type': 'none'}
    return p

def wall_graffiti():
    p = Prop('wall_graffiti', 'dressing', 'freestanding graffiti wall — wallride bait')
    W, H, T = 3.6, 1.8, 0.25
    p.add(CONC_R, box(0, H / 2, 0, W, H, T))
    p.add(GRAF_A, uv_fit(quad((-W / 2, 0, T / 2 + 0.003), (W / 2, 0, T / 2 + 0.003),
                              (W / 2, H, T / 2 + 0.003), (-W / 2, H, T / 2 + 0.003))))
    p.add(GRAF_B, uv_fit(quad((W / 2, 0, -T / 2 - 0.003), (-W / 2, 0, -T / 2 - 0.003),
                              (-W / 2, H, -T / 2 - 0.003), (W / 2, H, -T / 2 - 0.003))))
    p.grind(-W / 2, 0, W / 2, 0, H, H, 'ledge')
    p.collider = {'type': 'box', 'hw': W / 2, 'hd': T / 2, 'h': H}
    return p

def shade_sail():
    p = Prop('shade_sail', 'dressing', 'council shade sail on galv posts')
    posts = [(-2.2, 3.2, -1.6), (2.4, 3.4, -1.2), (0.0, 3.0, 2.2)]
    for x, h, z in posts:
        p.add(GALV, tube([(x, 0, z), (x * 0.92, h, z * 0.92)], 0.055, seg=8))
    n = 6
    a, b, c = [(x * 0.92, h - 0.05, z * 0.92) for x, h, z in posts]
    rows = []
    for i in range(n + 1):
        u = i / n
        pa = tuple(a[k] + (b[k] - a[k]) * u for k in range(3))
        pb = tuple(c[k] + (b[k] - c[k]) * u for k in range(3))
        row = []
        for j in range(n + 1):
            v = j / n
            pt = tuple(pa[k] + (pb[k] - pa[k]) * v for k in range(3))
            sag = 0.5 * math.sin(math.pi * u) * math.sin(math.pi * v)
            row.append((pt[0], pt[1] - sag, pt[2]))
        rows.append(row)
    p.add(SAIL, sheet(rows))
    p.collider = {'type': 'cylinder', 'r': 0.1, 'h': 3.2}
    return p

# =============================================================== vegetation
def tree_fig():
    p = Prop('tree_fig', 'vegetation', 'Moreton Bay fig — buttress roots, huge canopy')
    h = 2.8
    prof = [(0.95, 0.0), (0.62, 0.35), (0.5, 0.9), (0.46, 1.8), (0.5, h)]
    def buttress(iu, iv, r):
        fl = max(0.0, 1.0 - iv / 2.5) ** 2
        return r * (1 + fl * 0.5 * abs(math.sin(iu * 2.2 + 0.7)))
    p.add(BARKF, lathe(prof, seg=14, jitter=buttress, cap_top=True))
    for dx, dy, dz, rx, ry, rz, sd in [(0, 4.0, 0, 4.4, 1.9, 3.8, 1.0),
                                       (2.1, 3.4, 1.2, 2.6, 1.4, 2.2, 5.0),
                                       (-2.3, 3.6, -0.8, 2.4, 1.3, 2.4, 9.0)]:
        p.add(LEAFF, translate(blob(rx, ry, rz, seg=12, rings=7, amp=0.18, seed=sd),
                               dx, dy, dz))
    for bx, bz, tx, ty, tz in [(0.2, 0.1, 1.9, 3.5, 1.1), (-0.2, -0.1, -2.1, 3.7, -0.7)]:
        p.add(BARKF, tube([(bx, h - 0.4, bz), (tx, ty, tz)], 0.16, seg=7))
    p.collider = {'type': 'cylinder', 'r': 0.85, 'h': 2.8}
    return p

def tree_gum():
    p = Prop('tree_gum', 'vegetation', 'eucalypt — pale mottled trunk, sparse crown')
    h = 5.6
    prof = [(0.30, 0.0), (0.24, 0.5), (0.18, 2.5), (0.14, 4.2), (0.11, h)]
    p.add(BARKG, lathe(prof, seg=10, cap_top=True))
    p.add(BARKG, tube([(0, 4.1, 0), (1.3, 5.4, 0.6)], 0.09, seg=6))
    p.add(BARKG, tube([(0, 4.8, 0), (-1.1, 5.9, -0.5)], 0.08, seg=6))
    for dx, dy, dz, r, sd in [(0.3, 6.1, 0.2, 1.5, 2.0), (1.5, 5.8, 0.7, 1.2, 6.0),
                              (-1.3, 6.3, -0.6, 1.3, 11.0)]:
        p.add(LEAFG, translate(blob(r, r * 0.62, r, seg=10, rings=6, amp=0.25, seed=sd),
                               dx, dy, dz))
    p.collider = {'type': 'cylinder', 'r': 0.32, 'h': 5.6}
    return p

def mound_dirt():
    p = Prop('mound_dirt', 'dressing', 'dirt jump mound — ridable')
    R, H, n = 2.2, 0.55, 10
    rows = []
    for i in range(n + 1):
        zr = -R + 2 * R * i / n
        row = []
        for j in range(n + 1):
            xr = -R + 2 * R * j / n
            d2 = (xr * xr + zr * zr) / (R * R)
            y = H * math.exp(-3.2 * d2) * max(0.0, 1 - d2 * 0.55)
            row.append((xr, y, zr))
        rows.append(row)
    p.add(DIRT, sheet(rows, flip=True))
    p.element = {'kind': 'mogul', 'h': H, 's': 1.4}
    return p

# ====================================================== expansion: modular set
# John's editor taxonomy (2026-08-03): kink variants, pole jams, hubbas, boxes,
# pyramid, euro gap, vert wall, volcano, street props, park infrastructure.

def rail_from(pid, pts_xy, feet_x, desc, r=0.021, kind='rail'):
    """Polyline rail in the xz=0 plane. pts_xy: (x, y) knots -> one grind
    segment per span; feet dropped at feet_x (height lerped from the line)."""
    p = Prop(pid, 'obstacle', desc)
    p.add(STEEL, tube([(x, y, 0) for x, y in pts_xy], r, seg=10))
    def y_at(x):
        for (x0, y0), (x1, y1) in zip(pts_xy, pts_xy[1:]):
            if x0 - 1e-6 <= x <= x1 + 1e-6:
                return y0 + (y1 - y0) * (x - x0) / (x1 - x0)
        return pts_xy[-1][1]
    for fx in feet_x:
        p.add(GALV, tube([(fx, 0, 0), (fx, y_at(fx) - r, 0)], 0.018, seg=8))
        p.add(GALV, box(fx, 0.006, 0, 0.16, 0.012, 0.12))
    for (x0, y0), (x1, y1) in zip(pts_xy, pts_xy[1:]):
        p.grind(x0, 0, x1, 0, y0, y1, kind)
    p.collider = {'type': 'none'}
    return p

def square_flatbar():
    p = Prop('square_flatbar', 'obstacle', 'square-section flatbar')
    L, h = 2.4, 0.4
    p.add(STEEL, box(0, h - 0.03, 0, L, 0.06, 0.06))
    for fx in (-L / 2 + 0.2, L / 2 - 0.2):
        p.add(GALV, box(fx, (h - 0.06) / 2, 0, 0.05, h - 0.06, 0.05))
        p.add(GALV, box(fx, 0.006, 0, 0.16, 0.012, 0.12))
    p.grind(-L / 2, 0, L / 2, 0, h, h, 'rail')
    p.collider = {'type': 'none'}
    return p

def pole_jam():
    p = Prop('pole_jam', 'obstacle', 'bent pole jammed out of the concrete, 35 deg')
    L, ang = 1.7, math.radians(35)
    tip = (L * math.cos(ang), L * math.sin(ang))
    p.add(STEEL, tube([(-0.05, 0.0, 0), (tip[0], tip[1], 0)], 0.035, seg=10))
    p.add(CONC_R, box(0, 0.04, 0, 0.5, 0.08, 0.5))     # broken footing stub
    p.grind(0, 0, tip[0], 0, 0.05, tip[1], 'rail')
    p.collider = {'type': 'none'}
    return p

def sloped_box(pid, L, w, y0, y1, desc, mat=None, cat='obstacle', graf=False):
    """Box whose top slopes from y0 (at -x) to y1 (+x): hubbas, manny pads."""
    mat = mat or CONC
    p = Prop(pid, cat, desc)
    rows = [[(-L / 2, y0, -w / 2), (-L / 2, y0, w / 2)],
            [(L / 2, y1, -w / 2), (L / 2, y1, w / 2)]]
    p.add(mat, sheet(rows, flip=True))
    for sz in (-w / 2, w / 2):        # side walls
        pts = [(-L / 2, 0, sz), (L / 2, 0, sz), (L / 2, y1, sz), (-L / 2, y0, sz)]
        f = fan(pts, lambda pp: (pp[0], pp[1]), out=(0, 0, sz))
        p.add(mat, f)
    for sx, yy in ((-L / 2, y0), (L / 2, y1)):   # end caps
        p.add(mat, fan([(sx, 0, -w / 2), (sx, 0, w / 2), (sx, yy, w / 2), (sx, yy, -w / 2)],
                       lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    if graf:
        p.add(GRAF_B, uv_fit(fan([(-L / 2, 0, w / 2 + 0.003), (L / 2, 0, w / 2 + 0.003),
                                  (L / 2, y1, w / 2 + 0.003), (-L / 2, y0, w / 2 + 0.003)],
                                 lambda pp: (pp[0], pp[1]), out=(0, 0, 1))))
    for sz in (-w / 2, w / 2):
        p.grind(-L / 2, sz, L / 2, sz, y0, y1, 'ledge')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': w / 2, 'h': max(y0, y1)}
    return p

def hubba_down():
    # flat 0.8m at stair-top height, then down the imaginary stairs
    p = Prop('hubba_down', 'obstacle', 'flat-to-down hubba ledge')
    w, hf, hl = 0.42, 0.66, 0.12
    Lf, Ld = 0.8, 1.8
    top = sheet([[(-(Lf + Ld) / 2, hf, -w / 2), (-(Lf + Ld) / 2, hf, w / 2)],
                 [(-(Lf + Ld) / 2 + Lf, hf, -w / 2), (-(Lf + Ld) / 2 + Lf, hf, w / 2)],
                 [((Lf + Ld) / 2, hl, -w / 2), ((Lf + Ld) / 2, hl, w / 2)]], flip=True)
    p.add(CONC, top)
    x0, xk, x1 = -(Lf + Ld) / 2, -(Lf + Ld) / 2 + Lf, (Lf + Ld) / 2
    for sz in (-w / 2, w / 2):
        pts = [(x0, 0, sz), (x1, 0, sz), (x1, hl, sz), (xk, hf, sz), (x0, hf, sz)]
        p.add(CONC, fan(pts, lambda pp: (pp[0], pp[1]), out=(0, 0, sz)))
    p.add(CONC, fan([(x0, 0, -w / 2), (x0, 0, w / 2), (x0, hf, w / 2), (x0, hf, -w / 2)],
                    lambda pp: (pp[2], pp[1]), out=(-1, 0, 0)))
    p.add(CONC, fan([(x1, 0, -w / 2), (x1, 0, w / 2), (x1, hl, w / 2), (x1, hl, -w / 2)],
                    lambda pp: (pp[2], pp[1]), out=(1, 0, 0)))
    for sz in (-w / 2, w / 2):
        p.grind(x0, sz, xk, sz, hf, hf, 'ledge')
        p.grind(xk, sz, x1, sz, hf, hl, 'ledge')
    p.collider = {'type': 'box', 'hw': (Lf + Ld) / 2, 'hd': w / 2, 'h': hf}
    return p

def grind_box(pid, L, w, h, desc, mat=None):
    mat = mat or PLY
    p = Prop(pid, 'obstacle', desc)
    p.add(mat, box(0, h / 2, 0, L, h, w))
    for sz in (1, -1):
        p.add(STEEL, angle_cap(-L / 2, L / 2, h, sz * w / 2))
        p.grind(-L / 2, sz * w / 2, L / 2, sz * w / 2, h, h, 'ledge')
    p.element = {'kind': 'ledge', 'hw': L / 2, 'hd': w / 2, 'h': h}
    return p

def pyramid():
    p = Prop('pyramid', 'obstacle', 'four-sided pyramid, flat top, steel edges')
    B, T, H = 4.8, 1.6, 0.8
    p.add(PLY, box(0, H - 0.02, 0, T, 0.04, T))              # flat top
    for i in range(4):                                        # four banks
        a = math.pi / 2 * i
        pts = [(-B / 2, 0, B / 2), (B / 2, 0, B / 2), (T / 2, H, T / 2), (-T / 2, H, T / 2)]
        f = fan(pts, lambda pp: (pp[0], pp[2]))
        f = rotate_y(f, a)
        ndir = (math.sin(a), 0.3, math.cos(a))
        d = sum(nn[k] * ndir[k] for nn in f['N'] for k in range(3))
        if d < 0:
            f['I'] = [f['I'][j + o] for j in range(0, len(f['I']), 3) for o in (0, 2, 1)]
            f['N'] = [(-x, -y, -z) for x, y, z in f['N']]
        p.add(PLY, f)
    for i in range(4):                                        # top edge caps + grinds
        a = math.pi / 2 * i
        cap = rotate_y(angle_cap(-T / 2, T / 2, H, T / 2), a)
        p.add(STEEL, cap)
        ca, sa = math.cos(a), math.sin(a)
        rot = lambda x, z: (x * ca + z * sa, -x * sa + z * ca)
        ax, az = rot(-T / 2, T / 2); bx, bz = rot(T / 2, T / 2)
        p.grind(ax, az, bx, bz, H, H, 'ledge')
    p.element = {'kind': 'funbox', 'hw': B / 2, 'hd': B / 2, 'h': H, 'skirt': (B - T) / 2}
    return p

def euro_gap():
    p = Prop('euro_gap', 'obstacle', 'euro gap: bank up, sheer drop off the deck')
    w, h, run, deck = 2.4, 0.75, 1.5, 1.0
    rows = [[(-w / 2, 0, run + deck / 2), (w / 2, 0, run + deck / 2)],
            [(-w / 2, h, deck / 2), (w / 2, h, deck / 2)]]
    p.add(PLY, sheet(rows))                                   # bank faces +z
    p.add(PLY, box(0, h - 0.02, 0, w, 0.04, deck))            # deck
    p.add(CONC_R, box(0, h / 2 - 0.02, -deck / 2 + 0.02, w, h - 0.04, 0.04))  # drop face
    for sx in (-w / 2, w / 2):
        p.add(GALV, fan([(sx, 0, -deck / 2), (sx, 0, run + deck / 2),
                         (sx, h, deck / 2), (sx, h, -deck / 2)],
                        lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.add(STEEL, angle_cap(-w / 2, w / 2, h, -deck / 2))
    p.grind(-w / 2, -deck / 2, w / 2, -deck / 2, h, h, 'ledge')
    p.element = {'kind': 'bank', 'len': w, 'h': h, 'run': run}
    return p

def volcano():
    p = Prop('volcano', 'obstacle', 'concrete volcano cone, grindable rim')
    prof = [(2.2, 0.0), (1.55, 0.28), (1.0, 0.62), (0.64, 0.95), (0.5, 1.1)]
    p.add(CONC, lathe(prof, seg=20, cap_top=True))
    r, y = 0.36, 1.1
    for (ax, az), (bx, bz) in [((-r, -r), (r, -r)), ((r, -r), (r, r)),
                               ((r, r), (-r, r)), ((-r, r), (-r, -r))]:
        p.grind(ax, az, bx, bz, y, y, 'rail')
    p.element = {'kind': 'mogul', 'h': 1.1, 's': 1.5}
    return p

def roller():
    p = Prop('roller', 'obstacle', 'concrete speed roller / pump bump')
    L, R, H, n = 2.4, 1.1, 0.32, 10
    rows = []
    for i in range(n + 1):
        z = -R + 2 * R * i / n
        y = H * math.exp(-3.0 * (z / R) ** 2)
        rows.append([(-L / 2, y, z), (L / 2, y, z)])
    p.add(CONC, sheet(rows, flip=True))
    for sx in (-L / 2, L / 2):
        pts = [(sx, 0, -R)] + [(sx, H * math.exp(-3.0 * ((-R + 2 * R * i / n) / R) ** 2),
                                -R + 2 * R * i / n) for i in range(n + 1)] + [(sx, 0, R)]
        p.add(CONC, fan(pts, lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.element = {'kind': 'mogul', 'h': H, 's': 0.9}
    return p

# ------------------------------------------------------------- street props
def jersey_barrier():
    p = Prop('jersey_barrier', 'furniture', 'concrete K-rail jersey barrier')
    L = 2.0
    prof = [(0.30, 0.0), (0.30, 0.06), (0.115, 0.55), (0.095, 0.81),
            (-0.095, 0.81), (-0.115, 0.55), (-0.30, 0.06), (-0.30, 0.0)]
    rows = [[(-L / 2, y, z), (L / 2, y, z)] for z, y in prof]
    p.add(CONC_R, sheet(rows, flip=True))
    for sx in (-L / 2, L / 2):
        p.add(CONC_R, fan([(sx, y, z) for z, y in prof],
                          lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.grind(-L / 2, 0, L / 2, 0, 0.81, 0.81, 'ledge')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': 0.3, 'h': 0.81}
    return p

def parking_block():
    p = Prop('parking_block', 'furniture', 'concrete parking block — slappy bait')
    p.add(Mat('conc_yellow', tex='concrete_rough', uv=1.4, tint=(1.0, 0.85, 0.45, 1)),
          box(0, 0.075, 0, 1.7, 0.15, 0.16))
    p.grind(-0.85, 0, 0.85, 0, 0.15, 0.15, 'ledge')
    p.collider = {'type': 'none'}
    return p

def hydrant():
    p = Prop('hydrant', 'furniture', 'fire hydrant — bonk it')
    RED = Mat('hydrant_red', tint=(0.72, 0.14, 0.1, 1), rough=0.55, metal=0.2)
    p.add(RED, lathe([(0.14, 0.0), (0.11, 0.1), (0.11, 0.55), (0.13, 0.6),
                      (0.1, 0.7), (0.04, 0.78), (0.0, 0.8)], seg=12))
    p.add(RED, tube([(0, 0.45, -0.16), (0, 0.45, 0.16)], 0.05, seg=8))
    p.add(RED, tube([(-0.16, 0.45, 0), (0.16, 0.45, 0)], 0.05, seg=8))
    p.collider = {'type': 'cylinder', 'r': 0.2, 'h': 0.8}
    return p

def pool_edge():
    p = Prop('pool_edge', 'furniture', 'pool coping + tile band, 2m section')
    L = 2.0
    p.add(CONC_R, box(0, 0.06, -0.25, L, 0.12, 0.5))                    # deck slab
    p.add(Mat('bullnose', tex='concrete_smooth', uv=0.6, rough=0.7),
          tube([(-L / 2, 0.13, 0.01), (L / 2, 0.13, 0.01)], 0.055, seg=10))
    p.add(Mat('tiles', tex='tiles_pool', uv=0.62),
          fan([(-L / 2, -0.32, 0.05), (L / 2, -0.32, 0.05),
               (L / 2, 0.05, 0.05), (-L / 2, 0.05, 0.05)],
              lambda pp: (pp[0], pp[1]), out=(0, 0, 1)))
    p.grind(-L / 2, 0.01, L / 2, 0.01, 0.185, 0.185, 'rail')
    p.collider = {'type': 'none'}
    return p

# ----------------------------------------------------------- infrastructure
def fence_chain():
    p = Prop('fence_chain_3m', 'dressing', 'chain-link fence section')
    L, H = 3.0, 1.8
    MESH = Mat('chain_mesh', tint=(0.62, 0.66, 0.68, 0.38), rough=0.6,
               metal=0.7, double=True)
    p.add(MESH, fan([(-L / 2, 0.05, 0), (L / 2, 0.05, 0),
                     (L / 2, H - 0.05, 0), (-L / 2, H - 0.05, 0)],
                    lambda pp: (pp[0], pp[1]), out=(0, 0, 1)))
    p.add(GALV, tube([(-L / 2, H, 0), (L / 2, H, 0)], 0.021, seg=8))
    for sx in (-L / 2, L / 2):
        p.add(GALV, tube([(sx, 0, 0), (sx, H - 0.02, 0)], 0.024, seg=8))
    p.grind(-L / 2, 0, L / 2, 0, H, H, 'rail')
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': 0.03, 'h': H}
    return p

def floodlight():
    p = Prop('floodlight', 'dressing', 'park floodlight pole')
    H = 6.0
    p.add(GALV, lathe([(0.09, 0.0), (0.07, H * 0.6), (0.05, H)], seg=10))
    p.add(GALV, box(0, H + 0.05, 0, 1.2, 0.08, 0.1))
    LAMP = Mat('lamp', tint=(1, 1, 0.92, 1), rough=0.3, emissive=(0.9, 0.9, 0.75))
    for dx in (-0.45, 0.45):
        p.add(LAMP, box(dx, H + 0.14, 0.04, 0.3, 0.18, 0.22))
    p.collider = {'type': 'cylinder', 'r': 0.12, 'h': H}
    return p

def bleachers():
    p = Prop('bleachers_3', 'furniture', 'three-row spectator bleachers')
    L = 3.0
    for i in range(3):
        y, z = 0.32 + i * 0.3, i * 0.5
        p.add(SLATS, box(0, y - 0.025, z, L, 0.05, 0.45))       # seat plank
        p.add(GALV, box(0, y - 0.15, z + 0.18, L, 0.24, 0.04))  # riser
    for sx in (-L / 2 + 0.1, L / 2 - 0.1):                      # side frames
        p.add(GALV, fan([(sx, 0, -0.25), (sx, 0, 1.25), (sx, 0.92, 1.25), (sx, 0.92, 0.75),
                         (sx, 0.32, -0.25)],
                        lambda pp: (pp[2], pp[1]), out=(sx, 0, 0)))
    p.grind(-L / 2, -0.225, L / 2, -0.225, 0.32, 0.32, 'ledge') # bottom row edge
    p.grind(-L / 2, 0.775, L / 2, 0.775, 0.92, 0.92, 'ledge')   # top row edge
    p.collider = {'type': 'box', 'hw': L / 2, 'hd': 0.75, 'h': 0.92}
    return p

def drain_grate():
    p = Prop('drain_grate', 'dressing', 'flush drainage grate')
    p.add(Mat('grate', tex='steel_grate', uv=0.9, rough=0.5, metal=0.6),
          box(0, 0.011, 0, 0.9, 0.022, 0.6))
    p.add(CONC, box(0, 0.008, 0, 1.06, 0.016, 0.76))
    p.collider = {'type': 'none'}
    return p

# ---------------------------------------------------------------- build all
BUILDERS = [
    lambda: quarter('qp_24', 2.4, 1.2, 1.8, 'plywood quarter pipe 4ft, steel coping'),
    lambda: quarter('qp_18', 1.8, 0.9, 1.35, 'mini quarter 3ft'),
    lambda: bank('bank_12', 2.4, 0.9, 1.8, 'plywood wedge bank'),
    kicker, funbox_ply, spine_ply, manual_pad, ledge_concrete, grindbox_ply,
    lambda: flat_rail('rail_flat_3m', 3.0, 0.35, 2, 'round flat rail, 3m'),
    lambda: flat_rail('rail_flat_6m', 6.0, 0.45, 3, 'round flat rail, 6m'),
    rail_kink, rail_rainbow, pipe_full,
    bench_park, bench_concrete, picnic_table, bin_council, bollard_steel,
    railing_ped, planter_box, kerb_3m, wall_graffiti, shade_sail,
    tree_fig, tree_gum, mound_dirt,
    # ---- expansion: modular editor set
    lambda: quarter('qp_vert', 3.6, 2.4, 2.7, 'vert quarter 8ft'),
    lambda: quarter('wallride_qp', 3.0, 1.5, 1.5,
                    'wallride wall — transition to vertical', coping=False,
                    deck=False, mat=CONC),
    lambda: kicker('launch_high', w=1.5, h=0.9, run=1.6, desc='high launch ramp'),
    square_flatbar, pole_jam,
    lambda: rail_from('rail_down', [(-1.5, 0.78), (1.5, 0.18)],
                      (-1.3, 1.3), 'straight down rail'),
    lambda: rail_from('rail_kink2', [(-2.2, 0.68), (-1.0, 0.68), (0.1, 0.36),
                                     (0.9, 0.36), (2.2, 0.08)],
                      (-2.0, -0.4, 0.6, 2.0), 'double-kink down rail'),
    lambda: rail_from('rail_aframe', [(-1.8, 0.12), (0, 0.72), (1.8, 0.12)],
                      (-1.6, 0, 1.6), 'A-frame rail'),
    lambda: rail_from('rail_donkey', [(-1.6, 0.42), (0.6, 0.42), (1.5, 0.8)],
                      (-1.4, 0.4, 1.35), 'donkey-kick rail — kinks up at the end'),
    lambda: grind_box('box_low', 1.8, 0.5, 0.25, 'low grind box 10in'),
    lambda: grind_box('box_table', 2.4, 0.7, 0.62, 'high table box 24in'),
    hubba_down,
    lambda: sloped_box('manny_incline', 2.0, 1.6, 0.18, 0.4,
                       'inclined manual pad', graf=True),
    pyramid, euro_gap, volcano, roller,
    jersey_barrier, parking_block, hydrant, pool_edge,
    fence_chain, floodlight, bleachers, drain_grate,
]

def main():
    os.makedirs(PROPS, exist_ok=True)
    entries = []
    for b in BUILDERS:
        entries.append(b().save(PROPS, TEX))
    manifest = {
        'name': 'park_kit',
        'version': '0.1',
        'note': 'Original GODVERSE park objects. props/ and textures/ must ship together '
                '(GLBs reference ../textures/*.jpg). grinds are prop-local segments — '
                'rotate/translate with the prop and append to the park rails list. '
                'element = matching skatemakerpro terrain kind for real collision.',
        'textures': 'MODELBEAST flux_local (flux2-klein-4b), original generations',
        'props': entries,
    }
    with open(os.path.join(ROOT, 'manifest.json'), 'w') as f:
        json.dump(manifest, f, indent=1)
    cats = {}
    for e in entries: cats[e['category']] = cats.get(e['category'], 0) + 1
    print(f"manifest.json: {len(entries)} props {cats}")

if __name__ == '__main__':
    main()