Computes a position in view space based on a fragment’s screen position expressed as uv coordinates, the fragments depth value and the camera’s inverse projection matrix.

Computes a screen position expressed as uv coordinates based on a fragment’s position in view space and the camera’s projection matrix

Computes a normal vector based on depth data. Can be used as a fallback when no normal render target is available or if flat surface normals are required.

Interleaved Gradient Noise (IGN) from Jimenez 2014.

IGN has “low discrepancy” resulting in evenly distributed samples. It’s superior compared to default white noise, blue noise or Bayer.

References:

• {@link https://www.iryoku.com/next-generation-post-processing-in-call-of-duty-advanced-warfare/}
• {@link https://blog.demofox.org/2022/01/01/interleaved-gradient-noise-a-different-kind-of-low-discrepancy-sequence/}

Vogel disk sampling for uniform circular distribution.

This function generates sample points distributed uniformly on a disk using the golden angle, resulting in an efficient low-discrepancy sequence for sampling. The rotation parameter (phi) allows randomizing the pattern per-pixel when combined with IGN.