zwitschi
bc2e421d33
- street_mesh.py: continental zebra markings (0.5 m bars, 0.5 m gaps, 3 m band) at all three signalised crossings, triangles not quads (FBX SDK refuses to triangulate the crown-twisted quads), stripes +6 cm above the DEM so they stay above the road surface; winding flipped so every street surface faces up (road/sidewalks/markings were 100% down-facing and invisible in engine once the terrain stopped covering them). - terrain_from_dem.py: cut a 10.7 m corridor around the Hollywood Blvd centreline so road, kerbs and sidewalks are not buried under the terrain; sidewalks themselves cover the transition band, walk-check stays at 0 holes. - Blender builders save with a writability guard + fatal failure: *.blend is LFS-lockable and checks out read-only; a failed save previously left downstream steps building from stale files. - ue_import_site.py: Crossing_Markings imports with no collision (paint on the road); ue_build_demo_map.py stages it and chmods the lockable .umap before saving (save_map silently returned False on read-only maps). - ue_build_review_map.py: demo-crossing camera moved to the real crossing (s=130.1 m -> UE -24291,-1340) and fixed the ensure_writable path (was missing the .umap suffix, so the chmod never fired).
94 lines
3.6 KiB
Python
94 lines
3.6 KiB
Python
"""Export the site meshes from the assembled site .blend, one FBX per object.
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blender -b --factory-startup Art/blender/site/site-2026-11-06.blend \
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--python Art/blender/site/export_site_fbx.py -- --out /tmp/gigline/site
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Why one file per object: terrain, road, sidewalks and kerbs want different
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collision settings in Unreal, and a single combined mesh cannot carry that.
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Uses the same named export preset `ue_metric_v1` as the scale test, so the metre
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to centimetre mapping is identical to the one already verified.
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"""
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import argparse
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import os
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import sys
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import bpy
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MESHES = ("Terrain_DEM", "Road_Hollywood", "Sidewalk_South", "Sidewalk_North",
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"Kerb_South", "Kerb_North", "Crossing_Markings")
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def main():
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argv = sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else []
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ap = argparse.ArgumentParser()
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ap.add_argument("--out", default="/tmp/gigline/site")
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args = ap.parse_args(argv)
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os.makedirs(args.out, exist_ok=True)
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print(f"[site] scene objects: {len(bpy.data.objects)}")
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found = []
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for name in MESHES:
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obj = bpy.data.objects.get(name)
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if obj is None or obj.type != "MESH":
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print(f"[site] MISSING {name}")
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continue
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found.append(name)
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for name in found:
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# export only the object under test: select it, export, deselect
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bpy.ops.object.select_all(action="DESELECT")
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obj = bpy.data.objects[name]
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obj.select_set(True)
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# Sidewalks were generated with their north/south offsets inverted relative
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# to the road and kerbs: in Unreal the north sidewalk landed at the south
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# kerb. Mirror this one object across Y so the export matches the source
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# frame instead of rotating the actor in the map.
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mirrored = False # the south sidewalk is correct in the .blend; see street_mesh
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if mirrored:
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obj.scale.y *= -1.0
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bpy.context.view_layer.objects.active = obj
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bpy.ops.object.transform_apply(location=False, rotation=False, scale=True)
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# Object mode has no mesh context; flip winding through the mesh data.
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me = obj.data
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for poly in me.polygons:
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verts = list(poly.vertices)
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verts.reverse()
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poly.vertices = verts
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me.update()
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_ = bpy.context.view_layer
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bpy.context.view_layer.objects.active = obj
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path = os.path.join(args.out, name + ".fbx")
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bpy.ops.export_scene.fbx(
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filepath=path,
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use_selection=True,
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object_types={"MESH"},
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apply_unit_scale=True,
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apply_scale_options="FBX_SCALE_NONE",
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axis_forward="-Y",
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axis_up="Z",
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use_space_transform=True,
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use_mesh_modifiers=True,
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mesh_smooth_type="OFF",
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path_mode="AUTO",
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bake_space_transform=False,
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)
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if mirrored:
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# The flip is an export correction, not a change to the source: undo it.
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obj.scale.y *= -1.0
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bpy.ops.object.transform_apply(location=False, rotation=False, scale=True)
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for poly in obj.data.polygons:
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verts = list(poly.vertices)
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verts.reverse()
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poly.vertices = verts
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obj.data.update()
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zs = [(obj.matrix_world @ v.co).z for v in obj.data.vertices]
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print(f"[site] {name:18} verts {len(obj.data.vertices):6} z {min(zs):+.2f}..{max(zs):+.2f} m "
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f"-> {path}")
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print(f"[site] exported {len(found)} of {len(MESHES)} meshes")
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main()
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