AnyImage/openspec/changes/unify-reference-depth/tasks.md

1. Shared reference depth

• 1.1 Add reference_depth(image, mask=None) to src/anyimage/common/depth.py: take the 95th percentile of camera Z over pixels whose Depth texture Alpha is greater than 0.95 and whose depth is finite and positive, and return model units.
• 1.2 Drop reference_depth from load_depth_metadata() and change depth_uniform_scale() to take the computed reference depth instead of reading it from metadata.
• 1.3 Move the base-shape direction fit into common/depth.py as fit_symmetry_depth_direction() beside fit_depth_direction(), then delete src/anyimage/operators/cutout_tool/depth_calibration.py.
• 1.4 Delete selection_calibration() from src/anyimage/operators/cutout_tool/geometry.py and remove its test.
• 1.5 Drop reference samples farther than REFERENCE_DEPTH_RANGE_FACTOR times the median before the percentile, and return REFERENCE_DEPTH_BASELINE when there is no valid pixel at all.
• 1.6 Return the flat canonical direction from fit_depth_direction() when no sample is usable, and delete the caller-side try/except in plane conversion.

2. Server artifacts

• 2.1 Remove the reference_valid argument and the reference_depth field from write_depth_metadata() in src/anyimage/server/geometry/depth_texture.py.
• 2.2 Drop alpha_threshold from generate_moge_artifacts() and the cutout job parameters in src/anyimage/server/jobs/cutout.py.
• 2.3 Update the server metadata and artifact tests to expect a depth.json with only image_size and intrinsics.

3. Depth shape initialization

• 3.1 Compute the reference depth in create_depth_plane_object() and create_shape_object(); pass the cutout selection as the reference mask and use the whole depth image for plane conversion.
• 3.2 Delete the transparency gate, DEFAULT_DEPTH_BASELINE, DEFAULT_DEPTH_DIRECTION fallback usage, and the adaptive calibration branch from the Cutout object creation path.
• 3.3 Update the operator and shared support fixtures so depth metadata no longer carries a reference depth and Cutout depth shapes build from the shared reference.
• 3.4 Add regression coverage that a skewed depth field returns the 95th percentile and that a selection mask narrows the reference domain.

4. Relief base plane

• 4.1 Change the Depth Offset default to 0 in tools/nodes/groups/image_relief_plane.py.
• 4.2 Run uv run node-group build to rebuild and validate src/anyimage/assets/O_AnyImage.blend.
• 4.3 Update the Relief Plane node tests and interface inventory for the new default and the reference-depth-driven base plane.

5. Verification

• 5.1 Run the affected pytest modules for common.depth, server artifacts, plane conversion, and cutout operators.
• 5.2 Search for stale reference_depth metadata reads, depth_calibration imports, and fixed-baseline references, then review the final diff.