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.

tests/tools/nodes/test_shadeless.py

@@ -12,14 +12,16 @@ def test_shadeless_alpha_is_mixed_inside_the_group(tmp_path):
     addon_utils.enable("cycles", default_set=False)
     group = load_node_group("O Shadeless")
     inputs = {s.name: s for s in group.interface.items_tree if s.item_type == "SOCKET" and s.in_out == "INPUT"}
-    assert list(inputs) == ["Color", "Alpha"] and inputs["Alpha"].default_value == 1
+    assert list(inputs) == ["Color", "Alpha", "Strength"]
+    assert inputs["Alpha"].default_value == 1 and inputs["Strength"].default_value == 1
+    assert inputs["Strength"].min_value == 0
     scene = bpy.context.scene
     scene.render.engine = "CYCLES"
     scene.cycles.device = "CPU"
     scene.cycles.samples = 8
     scene.cycles.use_denoising = False
     scene.render.film_transparent = True
-    scene.render.resolution_x, scene.render.resolution_y = 96, 32
+    scene.render.resolution_x, scene.render.resolution_y = 128, 32
     scene.render.resolution_percentage = 100
     scene.render.image_settings.file_format = "OPEN_EXR"
     scene.render.image_settings.color_mode = "RGBA"
@@ -28,27 +30,29 @@ def test_shadeless_alpha_is_mixed_inside_the_group(tmp_path):
     bpy.ops.object.camera_add(location=(0, 0, 5))
     scene.camera = bpy.context.object
     scene.camera.data.type = "ORTHO"
-    scene.camera.data.ortho_scale = 3
-    for index, alpha in enumerate((0, 0.5, 1)):
-        bpy.ops.mesh.primitive_plane_add(size=1, location=(index - 1, 0, 0))
-        material = bpy.data.materials.new(f"Alpha {alpha}")
+    scene.camera.data.ortho_scale = 4
+    for index, (alpha, strength) in enumerate(((0, 1), (0.5, 1), (1, 1), (1, 2))):
+        bpy.ops.mesh.primitive_plane_add(size=1, location=(index - 1.5, 0, 0))
+        material = bpy.data.materials.new(f"Alpha {alpha} Strength {strength}")
         material.use_nodes = True
         material.node_tree.nodes.clear()
         shader = material.node_tree.nodes.new("ShaderNodeGroup")
         shader.node_tree = group
         shader.inputs["Color"].default_value = (4, 2, 0.5, 1)
         shader.inputs["Alpha"].default_value = alpha
+        shader.inputs["Strength"].default_value = strength
         output = material.node_tree.nodes.new("ShaderNodeOutputMaterial")
         material.node_tree.links.new(shader.outputs[0], output.inputs["Surface"])
         bpy.context.object.data.materials.append(material)
     bpy.ops.render.render(write_still=True)
     image = bpy.data.images.load(scene.render.filepath, check_existing=False)
     try:
-        pixels = np.array(image.pixels[:]).reshape(32, 96, 4)
-        for index, alpha in enumerate((0, 0.5, 1)):
+        pixels = np.array(image.pixels[:]).reshape(32, 128, 4)
+        for index, alpha in enumerate((0, 0.5, 1, 1)):
             patch = pixels[8:24, index * 32 + 8:index * 32 + 24]
             np.testing.assert_allclose(patch[..., 3].mean(), alpha, atol=0.035)
         np.testing.assert_allclose(pixels[16, 80, :3], (4, 2, 0.5), atol=1e-4)
+        np.testing.assert_allclose(pixels[16, 112, :3], (8, 4, 1), atol=1e-4)
     finally:
         bpy.data.images.remove(image)
         bpy.ops.wm.read_factory_settings(use_empty=True)