ba4589e894
Implementation of the design task #142969. This adds the following: - Exact GPU interpolation of curves of all types. - Radius attribute support. - Cyclic curve support. - Resolution attribute support. - New Cylinder hair shape type.  What changed: - EEVEE doesn't compute random normals for strand hairs anymore. These are considered legacy now. - EEVEE now have an internal shadow bias to avoid self shadowing on hair. - Workbench Curves Strip display option is no longer flat and has better shading. - Legacy Hair particle system evaluates radius at control points before applying additional subdivision. This now matches Cycles. - Color Attribute Node without a name do not fetch the active color attribute anymore. This now matches Cycles. Notes: - This is not 100% matching the CPU implementation for interpolation (see the epsilons in the tests). - Legacy Hair Particle points is now stored in local space after interpolation. The new cylinder shape allows for more correct hair shading in workbench and better intersection in EEVEE. | | Strand | Strip | Cylinder | | ---- | --- | --- | --- | | Main |  |  | N/A | | PR |  |  |  | | | Strand | Strip | Cylinder | | ---- | --- | --- | --- | | Main |  | | N/A | | PR | ||  | Cyclic Curve, Mixed curve type, and proper radius support:  Test file for attribute lookup: [test_attribute_lookup.blend](/attachments/1d54dd06-379b-4480-a1c5-96adc1953f77) Follow Up Tasks: - Correct full tube segments orientation based on tangent and normal attributes - Correct V resolution property per object - More attribute type support (currently only color) TODO: - [x] Attribute Loading Changes - [x] Generic Attributes - [x] Length Attribute - [x] Intercept Attribute - [x] Original Coordinate Attribute - [x] Cyclic Curves - [x] Legacy Hair Particle conversion - [x] Attribute Loading - [x] Additional Subdivision - [x] Move some function to generic headers (VertBuf, OffsetIndices) - [x] Fix default UV/Color attribute assignment Pull Request: https://projects.blender.org/blender/blender/pulls/143180
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