manim/manimlib/shaders/surface_frag.glsl

#version 330

// in vec4 v_color;
// out vec4 frag_color;

uniform vec3 light_source_position;

in vec3 xyz_coords;
in vec3 v_normal;
in vec4 v_color;
in float v_gloss;

out vec4 frag_color;

#INSERT add_light.glsl

void main() {
    frag_color = add_light(v_color, xyz_coords, normalize(v_normal), light_source_position, v_gloss);
}