Rasterization is a rendering technique that converts vector data (triangle projections) to pixel data (render target) by determining which pixels are covered by triangles. Normally, a GPU determines whether or not to rasterize a pixel by sampling points within the pixel to determine whether they are covered by the triangle; if the coverage is sufficient, then the GPU determines that the pixel is covered. Conservative rasterization means that the GPU rasterizes a pixel that is partially covered by a triangle, regardless of coverage. This is useful when certainty is required, such as when performing occlusion culling, collision detection on the GPU, or visibility detection.
Conservative rasterization means that the GPU generates more fragments on triangle edges; this leads to more fragment shader invocations, which can lead to increased GPU frame times.
Check for hardware support using the SystemInfo.supportsConservativeRaster API. On hardware that does not support this command, it is ignored.
Shader "Examples/CommandExample"
{
SubShader
{
// The rest of the code that defines the SubShader goes here.
Pass
{
// Enable conservative rasterization for this Pass.
Conservative True
// The rest of the code that defines the Pass goes here.
}
}
}