///// VERTEX //////

// vertex
attribute vec3 vertex;

///// COLOR //////

// color
attribute vec4 color;

///// MATRIX /////

// matrix
attribute mat4 params;

void main()
{
    if(prepareToComputeVertex(color, true)) {
        mat4 newMatrix = mat4(1.0);
        vec3 heightDir = normalize( cross(params[0].xyz, params[1].xyz) );
        heightDir *= params[3][0];

        newMatrix[0] = vec4(params[1].xyz, 0);
        newMatrix[1] = vec4(heightDir, 0);
        newMatrix[2] = vec4(params[0].xyz, 0);
        newMatrix[3] = vec4(params[2].xyz, 1);

        gl_Position = gl_ModelViewProjectionMatrix * newMatrix * vec4(vertex, 1);
    }
}