feat: implement separate geometry handling for panorama mask regions

- Replace Delete Geometry with Separate Geometry in O Image Depth Panorama to manage low and high mask areas independently.
- Adjust depth processing to ensure low mask regions are displaced to Dome Radius while high mask regions follow existing depth rules.
- Update tests to validate new behavior, ensuring outputs align with expected results for both mask states.
- Enhance material handling by introducing emission strength in the shadeless group.

tools/nodes/groups/shadeless.py

@@ -17,6 +17,11 @@ def build_shadeless_group():
     alpha = group.interface.new_socket(name="Alpha", in_out="INPUT", socket_type="NodeSocketFloat")
     alpha.default_value, alpha.min_value, alpha.max_value = 1.0, 0.0, 1.0
     alpha.subtype = "FACTOR"
+    strength = group.interface.new_socket(
+        name="Strength", in_out="INPUT", socket_type="NodeSocketFloat"
+    )
+    strength.description = "Set the emission strength for camera rays. Zero renders the surface black."
+    strength.default_value, strength.min_value = 1.0, 0.0
     nodes = group.nodes
     links = group.links
     group_input = nodes.new("NodeGroupInput")
@@ -26,6 +31,7 @@ def build_shadeless_group():
     emission = nodes.new("ShaderNodeEmission")
     links.new(group_input.outputs["Color"], diffuse.inputs["Color"])
     links.new(group_input.outputs["Color"], emission.inputs["Color"])
+    links.new(group_input.outputs["Strength"], emission.inputs["Strength"])
 
     light_path = nodes.new("ShaderNodeLightPath")
     bounce_count = nodes.new("ShaderNodeMath")