normalMatrix

Danger

This uniform only works with the “core profile” in Minecraft 1.17 and newer. It is recommended to use the “compatibility profile” with Iris for better support.

uniform mat3 normalMatrix;

Matrix to transform a model space normal vector to view space. Equivalent to mat3(transpose(modelViewMatrixInverse)), or gl_NormalMatrix in the compatibility profile and older GLSL versions.

vec3 normal = normalMatrix * vaNormal;

vec3 normal = gl_NormalMatrix * gl_Normal;