nan
076a8c90f1
- Introduced the two-times upscale specification detailing requirements for unified output, fixed model presets, arbitrary dimensions, and consistent job behavior. - Added scenarios for existing models, repeated upscale, and handling of alpha preservation. - Created the unified depth plane specification outlining geometry modes, stable interface, and asset evaluation. - Defined scenarios for mode switching, relief and camera preservation, and validation of delivered assets.
32 lines
2.1 KiB
Markdown
32 lines
2.1 KiB
Markdown
# depth-scaled-tangent-normals Specification
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## Purpose
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TBD - created by archiving change scale-tangent-normals-with-depth. Update Purpose after archive.
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## Requirements
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### Requirement: Normal strength follows geometry depth scale
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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`.
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#### Scenario: Reduced relief depth reduces Tangent normal strength
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- **WHEN** an O Image Relief Plane uses a Tangent normal map and `Depth Scale` is set to 0.5
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- **THEN** the Tangent Normal Map Strength is one half of the value produced at `Depth Scale` 1 with the same `Normal Scale` input
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#### Scenario: Zero relief depth disables Tangent normal detail
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- **WHEN** an O Image Relief Plane uses a Tangent normal map and `Depth Scale` is set to 0
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- **THEN** the Tangent Normal Map Strength is zero
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#### Scenario: Depth extrapolation is preserved
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- **WHEN** an eligible Tangent-normal geometry group uses `Depth Scale` greater than 1
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- **THEN** `o_normal_reduction` is negative by the corresponding amount and the Tangent Normal Map Strength retains the extrapolated value without clamping
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### Requirement: Reduction attribute retains its material fallback
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`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.
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#### Scenario: Ordinary image material has no normal-scale attribute
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- **WHEN** an object using O Image Layer has no `o_normal_reduction` attribute
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- **THEN** its Tangent Normal Map Strength equals the `Normal Scale` input
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#### Scenario: Object Space normal strength follows the reduction
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- **WHEN** O Image Layer is configured for an Object Space normal map and its geometry has any `o_normal_reduction` value
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- **THEN** the Object Space Normal Map Strength equals the `Normal Scale` input multiplied by `1 - o_normal_reduction`
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