Basic.vert

#version 330 core 

// Input vertex data, different for all executions of this shader. 
layout(location = 0) in vec3 vertexPosition_modelspace; 
layout(location = 1) in vec2 vertexUV; 
layout(location = 2) in vec3 vertexNormal_modelspace; 

// Output data ; will be interpolated for each fragment. 
out vec2 UV; 
out vec4 vertexPosition_cameraspace; 
out vec3 EyeDirection_cameraspace; 
out vec3 Normal_cameraspace; 
 
// Values that stay constant for the whole mesh. 
uniform mat4 MVP; 
uniform mat4 V; 
uniform mat4 M; 


void main(){ 
    // Output position of the vertex, in clip space : MVP * position 
    gl_Position =  MVP * vec4(vertexPosition_modelspace,1); 
    // UV of the vertex. No special space for this one. 
    UV = vertexUV; 
    // model to camera = ModelView 
    Normal_cameraspace = normalize((V*M * vec4(vertexNormal_modelspace,0)).xyz); 
     
    // Position of the vertex, in worldspace : M * position 
    vertexPosition_cameraspace = ( V * M * vec4(vertexPosition_modelspace,1)); 
    //Eye vector. Eye is at 0 given this is camera space. 
    EyeDirection_cameraspace= normalize((vec4(0,0,0,1) - vertexPosition_cameraspace).xyz);     
}