Refactor image handling and update foreground processing

- Changed the logic in `remove_background_faces` to keep only faces with all foreground vertices.
- Updated background job to save foreground images with a new naming convention (`color.0001.png`).
- Replaced `copy_frames` with `copy_color_images` in various jobs to ensure consistent image naming.
- Introduced a new function `copy_color_images` to handle the copying of images with a specific naming format.
- Updated the BEN2 model to save output images with a new prefix for better clarity.
- Modified tests to reflect changes in image naming and processing logic.
- Added a new shadeless node group for improved material handling in geometry nodes.
- Enhanced validation scripts to check for new image naming conventions and ensure proper functionality.

src/snapform/server/jobs/surface.py

@@ -1,15 +1,18 @@
-from ..geometry import foreground_mesh_mask
+from ..geometry import build_surface, foreground_mesh_mask
+from ..media import copy_color_images
 from ..models import geometry_adapter, moge2
-from ..geometry import build_surface
-from ..outputs.surface import (
-    write_normal_texture,
-    write_surface_archive,
-    write_surface_texture,
-)
+from ..outputs.surface import write_normal_texture, write_surface_archive
 from .common import input_frames
 from .foreground import write_optional
 
 
+def inference_progress_message(model_name, index, total):
+    message = f"Estimating {model_name} geometry"
+    if total > 1:
+        message += f" ({index + 1}/{total})"
+    return message
+
+
 def run(context, parameters):
     context.progress(0.02, "Preparing surface input")
     context.directory.mkdir(parents=True, exist_ok=True)
@@ -27,7 +30,7 @@ def run(context, parameters):
                 include_points=True,
                 progress_callback=lambda index, total: context.progress(
                     0.12 + 0.58 * index / total,
-                    f"Estimating MoGe-2 geometry ({index + 1}/{total})",
+                    inference_progress_message("MoGe-2", index, total),
                 ),
                 cancel_check=context.check_cancelled,
             )
@@ -38,13 +41,13 @@ def run(context, parameters):
                 images,
                 progress_callback=lambda index, total: context.progress(
                     0.12 + 0.58 * index / total,
-                    f"Estimating DA3 geometry ({index + 1}/{total})",
+                    inference_progress_message("DA3", index, total),
                 ),
                 cancel_check=context.check_cancelled,
             )
         context.check_cancelled()
         frame = adapter.surface_frame(prediction)
-        foreground_paths = write_optional(
+        color_paths = write_optional(
             context,
             parameters,
             images,
@@ -52,19 +55,17 @@ def run(context, parameters):
             progress_span=0.08,
         )
         foreground_mask = None
-        if foreground_paths:
+        if color_paths:
             foreground_mask = foreground_mesh_mask(
-                foreground_paths[0],
+                color_paths[0],
                 frame.depth.shape,
             )
         context.progress(0.82, "Building surface")
         mesh = build_surface(frame, foreground_mask=foreground_mask)
         context.progress(0.92, "Writing surface")
         write_surface_archive(mesh, context.directory / "mesh.npz")
-        write_surface_texture(
-            foreground_paths[0] if foreground_paths else images[0],
-            context.directory / "texture.png",
-        )
+        if not color_paths:
+            copy_color_images(images, context.directory)
         if adapter is moge2:
             write_normal_texture(
                 prediction.normal[0],