BOOL Vox::Project(float objx, float objy, float objz, const mathfu::mat4 projMatrix, const mathfu::mat4 modelMatrix, RECT* viewport, int* winx, int* winy, int* winz)
{
    mathfu::vec4 in;
    mathfu::vec4 out;
    in.x = objx;
    in.y = objy;
    in.z = objz;
    in.w = 1.0f;
    out = modelMatrix * in;
    in = projMatrix * out;
    if (in.z == 0.0f) {
        return FALSE;
    }
    in.x = in.x / in.z;
    in.y = in.y / in.z;
    in.z = in.z / in.z;
    /* Map x, y and z to range 0-1 */
    in.x = in.x * 0.5f + 0.5f;
    in.y = in.y * 0.5f + 0.5f;
    in.z = in.z * 0.5f + 0.5f;
    /* Map x,y to viewport */
    in.x *= viewport->left + viewport->right;
    in.y *= viewport->top + viewport->bottom;
    *winx = int(in.x);
    *winy = int(in.y);
    *winz = int(in.z);
    return TRUE;
}