To create a shader pair that implements diffuse shading, take the following steps:
- The vertex shader computes the diffuse reflection equation and sends the result to the fragment shader via the output variable LightIntensity:
layout (location = 0) in vec3 VertexPosition; layout (location = 1) in vec3 VertexNormal; out vec3 LightIntensity; uniform vec4 LightPosition;// Light position in camera coords. uniform vec3 Kd; // Diffuse reflectivity uniform vec3 Ld; // Light source intensity uniform mat4 ModelViewMatrix; uniform mat3 NormalMatrix; uniform mat4 ProjectionMatrix; uniform mat4 MVP; // Projection * ModelView void main() { // Convert normal and position to eye coords vec3 tnorm = normalize( NormalMatrix * VertexNormal); ...
