27 lines
1.2 KiB
Markdown
27 lines
1.2 KiB
Markdown
## Why
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Tangent-space normal maps describe the full-depth surface. When a geometry node reduces its `Depth Scale`, its shape becomes flatter but the material normal remains at full strength, making surface detail appear too strong.
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## What Changes
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- Reuse the existing `o_normal_reduction` geometry attribute as the material-to-geometry contract for tangent-space normal strength.
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- Make tangent-normal depth geometry write `1 - Depth Scale` to that attribute, so the material normal strength follows the displayed geometric depth.
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- Extend the existing `O Image Layer` behavior without changing its attribute lookup or fallback semantics.
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- Make Object Space normal strength follow the same geometry reduction contract.
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- Reuse the existing `o_normal_reduction` contract for additional Tangent-normal depth geometry.
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## Capabilities
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### New Capabilities
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- `depth-scaled-tangent-normals`: Keep tangent-space material normal strength consistent with geometry depth scaling.
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### Modified Capabilities
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None.
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## Impact
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- Tangent-normal geometry-group builders, especially Relief Plane.
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- Normal-scale node tests; saved node assets must be rebuilt with `uv run node-group build`.
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- No server inference format, user-facing modifier socket, or dependency changes.
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