// 3d noise and turbulence vertex shader

// vertex to fragment communication for noise shaders
varying vec3 Nin;

void main()
{
    // compute diffuse lighting
    vec3 nn = normalize(gl_NormalMatrix*gl_Normal);
    vec3 nl = normalize(vec3(-1,1,1));
    gl_FrontColor = max(vec4(0,0,0,1),dot(nn,nl))*vec4(.9,.7,.5,0)
    	+ vec4(.1,.14,.18,1);

    // transform vertices into projection space using the pre-multiplied matrix
    gl_Position = gl_ModelViewProjectionMatrix*gl_Vertex;
    
    // compute scaled noise inputs
    Nin = gl_Vertex.xyz*.1;
}