2025-12-01

2026-03-17 14:58:51 -06:00
parent 183e865f8b
commit 4b82b57113
6846 changed files with 954887 additions and 162606 deletions
@@ -0,0 +1,64 @@
+import bmesh
+
+
+def export_sharp_features(bm: bmesh.types.BMesh, sharp_filepath: str, sharp_angle: float=35) -> int:
+    """Export edges marked sharp, boundary, and seams as sharp features as OBJ format"""
+
+    sharp_edges = []
+    bm.edges.index_update()
+    bm.edges.ensure_lookup_table()
+
+    for edge in bm.edges:
+        if edge.is_wire:
+            continue
+        if not edge.smooth:
+            convexity = 1 if edge.is_convex else 0
+            face = edge.link_faces[0]
+            face_index = face.index
+            for ei, e in enumerate(face.edges):
+                if e.index == edge.index:
+                    edge_index = ei
+                    break
+            sharp_edges.append(f"{convexity},{face_index},{edge_index}")
+
+    num_sharp_features = len(sharp_edges)
+    with open(sharp_filepath, 'w') as f:
+        f.write(f"{num_sharp_features}\n")
+        for edge in sharp_edges:
+            f.write(f"{edge}\n")
+        f.close()
+
+    return num_sharp_features
+
+
+def export_mesh(bm: bmesh.types.BMesh, mesh_filepath: str) -> None:
+    """Export mesh as OBJ format"""
+
+    verts = []
+    vert_normals = []
+    faces = []
+
+    for v in bm.verts:
+        verts.append(f"v {v.co.x:.6f} {v.co.y:.6f} {v.co.z:.6f}")
+
+    for fid, f in enumerate(bm.faces):
+        # NOTE: Blender will export per face normals if flat-shaded, per face per loop normals if smooth-shaded
+        vert_normals.append(f"vn {f.normal.x:.4f} {f.normal.y:.4f} {f.normal.z:.4f}")
+
+        face_verts = []
+        for v in f.verts:
+            # NOTE: OBJ indices start at 1
+            face_verts.append(f"{v.index + 1}//{fid + 1}")
+
+        faces.append(f"f {' '.join(face_verts)}")
+
+
+    with open(mesh_filepath, 'w') as f:
+        f.write("# OBJ file\n")
+        f.write('\n'.join(verts))
+        f.write('\n')
+        f.write('\n'.join(vert_normals))
+        f.write('\n')
+        f.write('\n'.join(faces))
+        f.write('\n')
+        f.close()