extract obj

viewer/src/utils/python/.gitignore

@@ -1 +1,3 @@
 *.ifcx
+*.obj
+ifc-data-horse

viewer/src/utils/python/extract.py

@@ -0,0 +1,35 @@
+def export_obj_raw(obj_path, points_out="points.txt", faces_out="faces.txt"):
+    vertices = []
+    faces = []
+
+    with open(obj_path, "r") as f:
+        for line in f:
+            # Vertex line: v x y z
+            if line.startswith("v "):
+                parts = line.strip().split()
+                # parts = ["v", x, y, z]
+                vertices.append(parts[1:4])
+
+            # Face line: f i/j/k i/j/k ...
+            elif line.startswith("f "):
+                parts = line.strip().split()[1:]
+                # Extract only vertex indices before any "/"
+                face_indices = [p.split("/")[0] for p in parts]
+                faces.append(face_indices)
+
+    # Write vertices
+    with open(points_out, "w") as f:
+        for v in vertices:
+            f.write(" ".join(v) + "\n")
+
+    # Write faces
+    with open(faces_out, "w") as f:
+        for face in faces:
+            f.write(" ".join(face) + "\n")
+
+    print(f"Export completed:\n  {points_out}\n  {faces_out}")
+
+
+# Example usage:
+export_obj_raw("cube.obj")
+

viewer/src/utils/python/hack.py

@@ -44,13 +44,11 @@ def show_nodes():
         else:
             print(item)
 
-def add_site(site_ref):
+def add_site(childrens):
     ref = str(uuid.uuid4())
     site = {
         "path" : ref,
-        "children" : {
+        "children" : childrens
-            "Site" : site_ref
-        }
     }
     return site,ref
 
@@ -76,6 +74,45 @@ def add_plane():
 
     return plane,ref
 
+def add_obj(path):
+
+    ref = str(uuid.uuid4())
+    vertices = []
+    faces = []
+
+    with open(path, "r") as f:
+        for line in f:
+            if line.startswith("v "):
+                parts = line.strip().split()
+                vertices.append(parts[1:4])
+
+            elif line.startswith("f "):
+                parts = line.strip().split()[1:]
+                face_indices = [p.split("/")[0] for p in parts]
+                faces.append(face_indices)
+
+    f = [int(x) for sub in faces for x in sub]
+    v = [[float(x) for x in sub] for sub in vertices]
+
+    mesh = {
+        "faceVertexIndices" : f,
+        "points" : v
+    }
+
+    obj = {
+        "path" : ref,
+        "attributes" : {
+            "usd::usdgeom::mesh": mesh
+        }
+    }
+
+    return obj, ref
+
+
+# Example usage:
+# export_obj_raw("model.obj")
+
+
 def generate():
     ostream = None
     try:
@@ -88,7 +125,16 @@ def generate():
     plane, plane_id = add_plane()
     items.append(plane)
 
-    site, site_id = add_site(plane_id)
+    obj, obj_id = add_obj("sphere.obj")
+    items.append(obj)
+
+    childrens = {
+        "Site" : plane_id,
+        "Obj" : obj_id
+
+    }
+
+    site, site_id = add_site(childrens)
     items.append(site)
 
     model["data"] = items