vertex shader

default.vert

attribute vec3 aVertexPosition;
attribute vec3 aVertexNormal;

uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat3 uNMatrix;

varying vec3 vNormal;
varying vec3 vEyeVec;

void main(void) {
    vec4 vertex = uMVMatrix * vec4(aVertexPosition, 1.0);
    
    vNormal = uNMatrix * aVertexNormal;
    vEyeVec = -vec3(vertex.xyz);
    
    gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
}