public Matrix4X4 RotateY(float angle)
{
float s = Math.Sin(angle);
float c = Math.Cos(angle);
// Cache the matrix values (makes for huge speed increases!)
float a00 = Elements[0], a01 = Elements[1], a02 = Elements[2], a03 = Elements[3];
float a20 = Elements[8], a21 = Elements[9], a22 = Elements[10], a23 = Elements[11];
// Perform axis-specific matrix multiplication
Elements[0] = a00 * c + a20 * -s;
Elements[1] = a01 * c + a21 * -s;
Elements[2] = a02 * c + a22 * -s;
Elements[3] = a03 * c + a23 * -s;
Elements[8] = a00 * s + a20 * c;
Elements[9] = a01 * s + a21 * c;
Elements[10] = a02 * s + a22 * c;
Elements[11] = a03 * s + a23 * c;
/*Elements[0] = c;
Elements[1] = 0;
Elements[2] = -s;
Elements[3] = 0;
Elements[4] = 0;
Elements[5] = 1;
Elements[6] = 0;
Elements[7] = 0;
Elements[8] = s;
Elements[9] = 0;
Elements[10] = c;
Elements[11] = 0;
Elements[12] = 0;
Elements[13] = 0;
Elements[14] = 0;
Elements[15] = 1;*/
return this;
}
