public void vecTimesM(Vec r)
{
this.x *= r.x;
this.y *= r.y;
this.z *= r.z;
}
public double dot(Vec r)
{
return(this.x * r.x + this.y * r.y + this.z * r.z);
}
public void minusM(Vec r)
{
this.x -= r.x;
this.y -= r.y;
this.z -= r.z;
}
public Vec minus(Vec r)
{
return(new Vec(x - r.x, y - r.y, z - r.z));
}
public void plusM(Vec r)
{
x += r.x;
y += r.y;
z += r.z;
}
public Vec plus(Vec r)
{
return(new Vec(x + r.x, y + r.y, z + r.z));
}
public void minus(Vec r, ref Vec outp)
{
outp.x = x - r.x;
outp.y = y - r.y;
outp.z = z - r.z;
}