public void set3DPoint(POINT3D P, double x, double y, double z)
{
P.x = x;
P.y = y;
P.z = z;
P.w = 1;
}
public void calcUVN()
{
object obj1 = UnitVector(VPN.x, VPN.y, VPN.z);
POINT3D tpoint2 = new POINT3D();
nUnitVectorVPN = obj1 != null ? (POINT3D)obj1 : tpoint2;
object obj = UnitVector(VUP.x, VUP.y, VUP.z);
POINT3D tpoint = new POINT3D();
upUnitVectorVUP = obj != null ? (POINT3D)obj : tpoint;
double num = DotProduct(nUnitVectorVPN, upUnitVectorVUP);
POINT3D P = new POINT3D();
set3DPoint(P, upUnitVectorVUP.x - num * nUnitVectorVPN.x, upUnitVectorVUP.y - num * nUnitVectorVPN.y, upUnitVectorVUP.z - num * nUnitVectorVPN.z);
object obj2 = UnitVector(P.x, P.y, P.z);
vUnitVectorUP = obj2 != null ? (POINT3D)obj2 : tpoint;
u = CrossProduct(vUnitVectorUP, nUnitVectorVPN);
}
public object UnitVector(double x, double y, double z)
{
double num = Math.Sqrt(x * x + y * y + z * z);
POINT3D P = new POINT3D();
set3DPoint(P, x / num, y / num, z / num);
return((object)P);
}
public POINT3D CrossProduct(POINT3D v1, POINT3D v2)
{
POINT3D tpoint = new POINT3D();
tpoint.x = v1.y * v2.z - v1.z * v2.y;
tpoint.y = v1.z * v2.x - v1.x * v2.z;
tpoint.z = v1.x * v2.y - v1.y * v2.x;
return(tpoint);
}
public double DotProduct(POINT3D v1, POINT3D v2)
{
return(v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
}
