Add new tests and functionality for image processing and geometry handling

- Introduced color_image.py for preparing standalone color images for tests.
- Added hdr_image.py to create HDR textures for testing.
- Implemented test_image_depth_panorama.py to evaluate panorama topology, UVs, and depth discontinuities.
- Created test_shadeless.py to validate the opacity and HDR color endpoints of the Shadeless group.
- Developed moge3_export.py for exporting dynamic MoGe-3 backbone and ONNX graphs.
- Added material.py to inherit material slots onto generated geometry.
- Built image_depth_panorama.py to construct a quad panorama with depth separation and sampling.

tools/nodes/common/depth_surface.py

@@ -168,8 +168,8 @@ def _remove_strip_faces(group, geometry, *, triangles=False):
     return delete.outputs["Geometry"]
 
 
-def split_depth_surface(group, geometry, image, strength, uniform, *, triangles=False):
-    """Keep each face's camera sample on its own corners before splitting."""
+def sample_face_camera(group, image):
+    """Sample camera XYZ at each planar face's UV center."""
     nodes, links = group.nodes, group.links
     uv = nodes.new("GeometryNodeInputNamedAttribute")
     uv.data_type = "FLOAT_VECTOR"
@@ -183,9 +183,17 @@ def split_depth_surface(group, geometry, image, strength, uniform, *, triangles=
     texture.extension = "EXTEND"
     links.new(image, texture.inputs["Image"])
     links.new(face_uv.outputs["Value"], texture.inputs["Vector"])
-    position = nodes.new("GeometryNodeInputPosition")
-    faces = _store(group, geometry, "face_center", position.outputs[0])
-    faces = _store(group, faces, "face_camera", texture.outputs["Color"])
+    return texture.outputs["Color"]
+
+
+def split_depth_surface(group, geometry, face_camera, strength, uniform, *,
+                        face_center=None, triangles=False):
+    """Split adjacent face samples using their Z depth and base center spacing."""
+    nodes, links = group.nodes, group.links
+    if face_center is None:
+        face_center = nodes.new("GeometryNodeInputPosition").outputs[0]
+    faces = _store(group, geometry, "face_center", face_center)
+    faces = _store(group, faces, "face_camera", face_camera)
     axes = nodes.new("ShaderNodeSeparateXYZ")
     links.new(_read(group, "face_camera"), axes.inputs[0])
     center_field = _read(group, "face_center")

tools/nodes/common/material.py

@@ -0,0 +1,22 @@
+"""Carry the input mesh's material slots onto generated geometry."""
+
+
+def inherit_material_slots(group, geometry, source):
+    nodes, links = group.nodes, group.links
+    capture = nodes.new("GeometryNodeCaptureAttribute")
+    capture.domain = "POINT"
+    capture.capture_items.clear()
+    capture.capture_items.new("BOOLEAN", "Source")
+    capture.inputs["Source"].default_value = True
+    links.new(source, capture.inputs["Geometry"])
+    join = nodes.new("GeometryNodeJoinGeometry")
+    links.new(geometry, join.inputs["Geometry"])
+    links.new(capture.outputs["Geometry"], join.inputs["Geometry"])
+    material = nodes.new("GeometryNodeSetMaterialIndex")
+    material.inputs["Material Index"].default_value = 0
+    links.new(join.outputs["Geometry"], material.inputs["Geometry"])
+    delete = nodes.new("GeometryNodeDeleteGeometry")
+    delete.domain = "POINT"
+    links.new(material.outputs["Geometry"], delete.inputs["Geometry"])
+    links.new(capture.outputs["Source"], delete.inputs["Selection"])
+    return delete.outputs["Geometry"]