Performance Bendable Line Sampling

Bendable Line Sprite Sampling

BendableLine keeps neighboring sheet colors out of its sprite region. Its shader clamps samples to texel centers within that region and selects the finest resident mip. It leaves texture and importer settings unchanged. The visual guide explains the supported inputs and the mip-residency requirement.

The native regression renders opaque red sprite regions surrounded by green. It checks every pixel center in the region and checks transparency immediately outside it. It covers one-pixel and four-pixel regions, point/bilinear/trilinear filters, padding, mipmaps, and texture mip biases of zero, four, and sixteen. Transparent captures below use the full 64 × 64 render target.

Input	Before	After
Unpadded, bilinear
Padded, bilinear, mipmapped, bias four

The original 16-case matrix passed eight cases and failed eight. The final 72 sampling cases pass, alongside all 35 existing fixture cases, on Unity 6000.6.7f1 with D3D11 in Release PlayMode. There are no skipped cases. Explicit LOD zero alone was insufficient with positive texture mip bias; the shader uses a negative requested LOD so the supported sampler bias cannot select a coarser mip. The point and padded controls remain part of the matrix.

The evidence record retains the case identities, source and result digests, process exit observations, image digests, and selected pixel values. The initial fixture source was not independently sealed; its original results and rendered examples are retained. This is D3D11 Editor evidence, with no claim about rendering speed or other graphics backends.

To repeat the capture, run BendableLineTests in PlayMode on a graphics-enabled editor. The repository's native test controller accepts -EnableEditorGraphics for D3D11. Set UH_SPRITE_CAPTURE_DIRECTORY to an output directory to retain each PNG. Headless runs explicitly skip the pixel matrix and continue to test the geometry and lifecycle behavior.