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马南
2026-09-19 21:31:36 +08:00
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openspec/changes/archive/2026-09-17-scale-tangent-normals-with-depth/specs/depth-scaled-tangent-normals/spec.md Normal file
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## ADDED Requirements
### Requirement: Normal strength follows geometry depth scale
When a Geometry Nodes group both exposes `Depth Scale` and is rendered with a normal map, it SHALL store `1 - Depth Scale` as the `o_normal_reduction` float attribute on its final geometry. `O Image Layer` SHALL calculate Tangent and Object Normal Map Strength as its `Normal Scale` input multiplied by `1 - o_normal_reduction`.
#### Scenario: Reduced relief depth reduces Tangent normal strength
- **WHEN** an O Image Relief Plane uses a Tangent normal map and `Depth Scale` is set to 0.5
- **THEN** the Tangent Normal Map Strength is one half of the value produced at `Depth Scale` 1 with the same `Normal Scale` input
#### Scenario: Zero relief depth disables Tangent normal detail
- **WHEN** an O Image Relief Plane uses a Tangent normal map and `Depth Scale` is set to 0
- **THEN** the Tangent Normal Map Strength is zero
#### Scenario: Depth extrapolation is preserved
- **WHEN** an eligible Tangent-normal geometry group uses `Depth Scale` greater than 1
- **THEN** `o_normal_reduction` is negative by the corresponding amount and the Tangent Normal Map Strength retains the extrapolated value without clamping
### Requirement: Reduction attribute retains its material fallback
`O Image Layer` SHALL use a factor of 1 for its Tangent Normal Map Strength when `o_normal_reduction` is absent. The existing `o_normal_reduction` material contract SHALL remain unchanged.
#### Scenario: Ordinary image material has no normal-scale attribute
- **WHEN** an object using O Image Layer has no `o_normal_reduction` attribute
- **THEN** its Tangent Normal Map Strength equals the `Normal Scale` input
#### Scenario: Object Space normal strength follows the reduction
- **WHEN** O Image Layer is configured for an Object Space normal map and its geometry has any `o_normal_reduction` value
- **THEN** the Object Space Normal Map Strength equals the `Normal Scale` input multiplied by `1 - o_normal_reduction`