Please refer to the shader chunk migration notes to help with updating chunk code: Shader Chunk Migrations | Learn PlayCanvas
In this case, the function signature was changed for engine/lightDiffuseLambert.js at main · playcanvas/engine · GitHub
So we need to update the shader chunk from
uniform sampler2D texture_ramp;
float getLightDiffuse() {
float light = max(dot(dNormalW, -dLightDirNormW), 0.0);
return texture2D(texture_ramp, vec2(light, 0.0)).g;
}
to
uniform sampler2D texture_ramp;
float getLightDiffuse(vec3 worldNormal, vec3 viewDir, vec3 lightDir, vec3 lightDirNorm) {
float light = max(dot(worldNormal, -lightDirNorm), 0.0);
return texture2D(texture_ramp, vec2(light, 0.0)).g;
}
Fixed fork: https://playcanvas.com/project/1063707/overview/f-toon-shader-with-skinning