static public PVector random2D(PVector target = null)
{
double angle = (_rand.NextDouble() * Math.PI * 2);
if (target == null)
{
target = new PVector(Math.Cos(angle), Math.Sin(angle), 0);
}
else
{
target.set(Math.Cos(angle), Math.Sin(angle), 0);
}
return(target);
}
public PVector cross(PVector v, PVector target)
{
double crossX = y * v.z - v.y * z;
double crossY = z * v.x - v.z * x;
double crossZ = x * v.y - v.x * y;
if (target == null)
{
target = new PVector(crossX, crossY, crossZ);
}
else
{
target.set(crossX, crossY, crossZ);
}
return(target);
}
static public PVector cross(PVector v1, PVector v2, PVector target)
{
double crossX = v1.y * v2.z - v2.y * v1.z;
double crossY = v1.z * v2.x - v2.z * v1.x;
double crossZ = v1.x * v2.y - v2.x * v1.y;
if (target == null)
{
target = new PVector(crossX, crossY, crossZ);
}
else
{
target.set(crossX, crossY, crossZ);
}
return(target);
}
public PVector normalize(PVector target)
{
if (target == null)
{
target = new PVector();
}
double m = mag();
if (m > 0)
{
target.set(x / m, y / m, z / m);
}
else
{
target.set(x, y, z);
}
return(target);
}
static public PVector random3D(PVector target = null)
{
double angle;
double vz;
angle = (_rand.NextDouble() * Math.PI * 2);
vz = (_rand.NextDouble() * 2 - 1);
double vx = (Math.Sqrt(1 - vz * vz) * Math.Cos(angle));
double vy = (Math.Sqrt(1 - vz * vz) * Math.Sin(angle));
if (target == null)
{
target = new PVector(vx, vy, vz);
//target.normalize(); // Should be unnecessary
}
else
{
target.set(vx, vy, vz);
}
return(target);
}
public PVector setMag(PVector target, double len)
{
target = normalize(target);
target.mult(len);
return(target);
}
static public double dot(PVector v1, PVector v2)
{
return(v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
}
public PVector cross(PVector v)
{
return(cross(v, null));
}
public double dot(PVector v)
{
return(x * v.x + y * v.y + z * v.z);
}
static public PVector div(PVector v, double n)
{
return(div(v, n, null));
}
static public PVector mult(PVector v, double n)
{
return(mult(v, n, null));
}
static public PVector sub(PVector v1, PVector v2)
{
return(sub(v1, v2, null));
}
static public PVector add(PVector v1, PVector v2)
{
return(add(v1, v2, null));
}