public void Setup(int ViewWidth, int ViewHeight)
/* initial setup for drawing that doesn't need to be done for every frame. */
{
if (!SetupDone) {
ArrowShape = MakeArrow(Shaded);
SetupDone = true;
} /*if*/
ProjectionMatrix =
Mat4f.frustum(
/*L =*/ -(float) ViewWidth / ViewHeight,
/*R =*/ (float) ViewWidth / ViewHeight,
/*B =*/ -1.0f,
/*T =*/ 1.0f,
/*N =*/ 1.0f,
/*F =*/ 10.0f)
.mul(Mat4f.translation(new Vec3f(0, 0, -3.0f)));
} /*Setup*/
