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johndoe6345789
915e18d67b
- map.load: Assimp-based glTF/GLB scene loader with auto physics generation - draw.map: renders all map meshes with JSON-driven texture-to-mesh mapping - export_room_gltf.py: exports seed workflow physics bodies to GLB - Seed demo room exported as map.glb (14 static meshes) - Texture mapping configurable per mesh name pattern in workflow JSON - Maps can be edited in Blender and re-exported Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
239 lines
7.5 KiB
Python
239 lines
7.5 KiB
Python
#!/usr/bin/env python3
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"""Export the seed demo room as a glTF/GLB file.
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Reads the seed_game.json workflow and converts all physics bodies
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(boxes) into a glTF scene with meshes. The output can be opened
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in Blender, edited, and re-exported for the engine to load.
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Usage:
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python export_room_gltf.py [--output packages/seed/map.glb]
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"""
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import argparse
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import json
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import struct
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import math
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from pathlib import Path
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def create_box_mesh(sx, sy, sz):
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"""Create a unit box mesh scaled by sx, sy, sz. Returns (vertices, indices).
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Vertex format: position(3) + normal(3) + uv(2) = 8 floats per vertex.
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"""
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hx, hy, hz = sx / 2, sy / 2, sz / 2
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# 6 faces, 4 vertices each = 24 vertices
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# Each face has its own normal for flat shading
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faces = [
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# front (+Z)
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(( hx, hy, hz), (-hx, hy, hz), (-hx, -hy, hz), ( hx, -hy, hz), ( 0, 0, 1)),
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# back (-Z)
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((-hx, hy, -hz), ( hx, hy, -hz), ( hx, -hy, -hz), (-hx, -hy, -hz), ( 0, 0, -1)),
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# right (+X)
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(( hx, hy, -hz), ( hx, hy, hz), ( hx, -hy, hz), ( hx, -hy, -hz), ( 1, 0, 0)),
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# left (-X)
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((-hx, hy, hz), (-hx, hy, -hz), (-hx, -hy, -hz), (-hx, -hy, hz), (-1, 0, 0)),
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# top (+Y)
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(( hx, hy, -hz), (-hx, hy, -hz), (-hx, hy, hz), ( hx, hy, hz), ( 0, 1, 0)),
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# bottom (-Y)
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(( hx, -hy, hz), (-hx, -hy, hz), (-hx, -hy, -hz), ( hx, -hy, -hz), ( 0, -1, 0)),
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]
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vertices = []
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indices = []
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uvs_face = [(1, 0), (0, 0), (0, 1), (1, 1)]
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for face_idx, (v0, v1, v2, v3, n) in enumerate(faces):
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base = len(vertices)
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for vi, (vx, vy, vz) in enumerate([v0, v1, v2, v3]):
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u, v = uvs_face[vi]
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# Scale UVs by face dimensions for tiling
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if abs(n[0]) > 0.5: # X-facing
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u *= sz
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v *= sy
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elif abs(n[1]) > 0.5: # Y-facing
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u *= sx
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v *= sz
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else: # Z-facing
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u *= sx
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v *= sy
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vertices.append((vx, vy, vz, n[0], n[1], n[2], u, v))
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indices.extend([base, base + 1, base + 2, base, base + 2, base + 3])
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return vertices, indices
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def build_gltf(bodies, output_path):
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"""Build a GLB file from a list of physics bodies."""
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import io
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nodes = []
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meshes = []
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accessors = []
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buffer_views = []
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bin_data = io.BytesIO()
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for body in bodies:
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name = body["name"]
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px = body.get("pos_x", 0)
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py = body.get("pos_y", 0)
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pz = body.get("pos_z", 0)
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sx = body.get("size_x", 1)
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sy = body.get("size_y", 1)
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sz = body.get("size_z", 1)
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shape = body.get("shape", "box")
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if shape == "capsule":
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continue # Skip player
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verts, idxs = create_box_mesh(sx, sy, sz)
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# Write index data (uint16)
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idx_offset = bin_data.tell()
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for i in idxs:
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bin_data.write(struct.pack("<H", i))
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idx_size = bin_data.tell() - idx_offset
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# Pad to 4-byte boundary
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while bin_data.tell() % 4 != 0:
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bin_data.write(b'\x00')
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# Write vertex data (float32 x 8 per vertex)
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vtx_offset = bin_data.tell()
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pos_min = [1e9, 1e9, 1e9]
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pos_max = [-1e9, -1e9, -1e9]
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for v in verts:
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bin_data.write(struct.pack("<8f", *v))
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for j in range(3):
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pos_min[j] = min(pos_min[j], v[j])
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pos_max[j] = max(pos_max[j], v[j])
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vtx_size = bin_data.tell() - vtx_offset
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# Buffer views
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idx_bv = len(buffer_views)
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buffer_views.append({
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"buffer": 0, "byteOffset": idx_offset,
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"byteLength": idx_size, "target": 34963 # ELEMENT_ARRAY_BUFFER
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})
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vtx_bv = len(buffer_views)
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buffer_views.append({
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"buffer": 0, "byteOffset": vtx_offset,
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"byteLength": vtx_size, "byteStride": 32,
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"target": 34962 # ARRAY_BUFFER
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})
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# Accessors
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idx_acc = len(accessors)
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accessors.append({
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"bufferView": idx_bv, "componentType": 5123, # UNSIGNED_SHORT
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"count": len(idxs), "type": "SCALAR"
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})
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pos_acc = len(accessors)
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accessors.append({
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"bufferView": vtx_bv, "byteOffset": 0,
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"componentType": 5126, "count": len(verts), # FLOAT
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"type": "VEC3", "min": pos_min, "max": pos_max
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})
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nrm_acc = len(accessors)
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accessors.append({
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"bufferView": vtx_bv, "byteOffset": 12,
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"componentType": 5126, "count": len(verts),
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"type": "VEC3"
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})
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uv_acc = len(accessors)
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accessors.append({
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"bufferView": vtx_bv, "byteOffset": 24,
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"componentType": 5126, "count": len(verts),
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"type": "VEC2"
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})
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# Mesh
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mesh_idx = len(meshes)
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meshes.append({
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"name": name,
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"primitives": [{
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"attributes": {
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"POSITION": pos_acc,
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"NORMAL": nrm_acc,
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"TEXCOORD_0": uv_acc
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},
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"indices": idx_acc
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}]
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})
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# Node with translation
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nodes.append({
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"name": name,
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"mesh": mesh_idx,
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"translation": [px, py, pz]
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})
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# Build glTF JSON
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gltf = {
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"asset": {"version": "2.0", "generator": "metabuilder-export"},
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"scene": 0,
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"scenes": [{"name": "SeedDemo", "nodes": list(range(len(nodes)))}],
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"nodes": nodes,
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"meshes": meshes,
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"accessors": accessors,
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"bufferViews": buffer_views,
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"buffers": [{"byteLength": bin_data.tell()}]
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}
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# Write GLB
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gltf_json = json.dumps(gltf, separators=(',', ':'))
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# Pad JSON to 4-byte boundary
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while len(gltf_json) % 4 != 0:
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gltf_json += ' '
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bin_bytes = bin_data.getvalue()
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while len(bin_bytes) % 4 != 0:
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bin_bytes += b'\x00'
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total_size = 12 + 8 + len(gltf_json) + 8 + len(bin_bytes)
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with open(output_path, 'wb') as f:
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# GLB header
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f.write(struct.pack("<III", 0x46546C67, 2, total_size))
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# JSON chunk
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f.write(struct.pack("<II", len(gltf_json), 0x4E4F534A))
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f.write(gltf_json.encode('ascii'))
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# BIN chunk
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f.write(struct.pack("<II", len(bin_bytes), 0x004E4942))
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f.write(bin_bytes)
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print(f"Exported {len(nodes)} nodes to {output_path} ({total_size} bytes)")
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def main():
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parser = argparse.ArgumentParser(description="Export seed room as glTF/GLB")
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parser.add_argument("--workflow", default="packages/seed/workflows/seed_game.json")
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parser.add_argument("--output", default="packages/seed/map.glb")
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args = parser.parse_args()
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with open(args.workflow) as f:
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workflow = json.load(f)
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# Extract static level geometry only (mass=0, not player/dynamic)
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skip_keywords = {"player", "cube", "crate"}
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bodies = []
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for node in workflow.get("nodes", []):
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if node.get("type") == "physics.body.add":
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params = node.get("parameters", {})
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name = params.get("name", "")
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mass = params.get("mass", 0)
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# Only static bodies (mass=0), skip capsules and dynamic objects
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if mass != 0 or params.get("shape") == "capsule":
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continue
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if any(kw in name for kw in skip_keywords):
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continue
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if params.get("spinning", 0):
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continue
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bodies.append(params)
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build_gltf(bodies, args.output)
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if __name__ == "__main__":
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main()
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