A shadow filtering function performing basic filtering. This is in fact an unfiltered version of the shadow map with a binary [0,1] result.

A shadow filtering function performing PCF filtering with Vogel disk sampling and IGN.

Uses 5 samples distributed via Vogel disk pattern, rotated per-pixel using Interleaved Gradient Noise (IGN) to break up banding artifacts. Combined with hardware PCF (4-tap filtering per sample), this effectively provides 20 filtered taps with better distribution.

A shadow filtering function performing PCF soft filtering.

A shadow filtering function performing VSM filtering.

Retrieves or creates a shadow material for the given light source.

This function checks if a shadow material already exists for the provided light. If not, it creates a new NodeMaterial configured for shadow rendering and stores it in the shadowMaterialLib for future use.

Disposes the shadow material for the given light source.