czm_normal

An automatic GLSL uniform representing a 3x3 normal transformation matrix that transforms normal vectors in model coordinates to eye coordinates.

Positions should be transformed to eye coordinates using czm_modelView and normals should be transformed using czm_normal.

Like all automatic uniforms, czm_normal does not need to be explicitly declared. However, it can be explicitly declared when a shader is also used by other applications such as a third-party authoring tool.

// GLSL declaration
uniform mat3 czm_normal;

// Example
vec3 eyeNormal = czm_normal * normal;