public void TestRotateLikeZVector()
{
Point3 norm;
Random rand = new Random();
for(int i = 0x00; i < TestParameters.PointTest; i++) {
double x = 200.0*rand.NextDouble()-100.0d;
double y = 200.0*rand.NextDouble()-100.0d;
norm = new Point3(0.0d, 0.0d, 1.0d);
double rinv = 1.0d/Math.Sqrt(x*x+y*y+1.0d);
norm.RotateLikeZVector(x, y);
Assert.IsTrue(Math.Abs(norm.X-x*rinv) <= Math.Sqrt(Maths.GlobalEpsilon));
Assert.IsTrue(Math.Abs(norm.Y-y*rinv) <= Math.Sqrt(Maths.GlobalEpsilon));
Assert.IsTrue(Math.Abs(norm.Z-rinv) <= Math.Sqrt(Maths.GlobalEpsilon));
}
}
public void TweakNormal(Point3 tu, Point3 normal, Point3 bumpx, Point3 bumpy)
{
int y = Maths.Border(0x00, (int)Math.Round(Height*tu.Y), Height-0x01);
int x = Maths.Border(0x00, (int)Math.Round(Width*tu.X), Width-0x01);
int x0 = (x+Width-0x01)%Width;
int y0 = ((y+Height-0x01)%Height)*Width;
y *= Width;
double xdiff = ((int)(Pixel[y+x]&0xff)-(int)(Pixel[y+x0]&0xff))/255.0d;
double ydiff = ((int)(Pixel[y+x]&0xff)-(int)(Pixel[y0+x]&0xff))/255.0d;
normal.RotateLikeZVector(xdiff, ydiff);
}