public NuGenRot3F(NuGenVec3F from, NuGenVec3F to)
{
from.Normalize();
to.Normalize();
float cost =
NuGenVec3F.Dot(from, to) /
(float)Math.Sqrt(NuGenVec3F.Dot(from, to) * NuGenVec3F.Dot(to, to));
if (cost > 0.99999)
{
r = 1;
v = new NuGenVec3F(0, 0, 0);
}
else if (cost < -0.99999)
{
NuGenVec3F frm = from.Normalized;
v = NuGenVec3F.Cross(frm, NuGenVec3F.UnitX);
if (v.Length < 0.00001)
{
v = NuGenVec3F.Cross(frm, NuGenVec3F.UnitY);
}
r = 0;
v.Normalize();
}
else
{
r = (float)Math.Sqrt(0.5 * (1.0 + cost));
v = NuGenVec3F.Cross(from, to);
v *= (float)Math.Sqrt((0.5 * (1.0 - cost)) / NuGenVec3F.Dot(v, v));
}
}
public static bool ApproxEquals(NuGenVec3F a, NuGenVec3F b)
{
return
(Math.Abs(a._x[0] - b._x[0]) < NuGenVector.TINY_FLOAT &&
Math.Abs(a._x[1] - b._x[1]) < NuGenVector.TINY_FLOAT &&
Math.Abs(a._x[2] - b._x[2]) < NuGenVector.TINY_FLOAT);
}
public static NuGenVec3F Max(NuGenVec3F a, NuGenVec3F b)
{
return(new NuGenVec3F(
Math.Max(a._x[0], b._x[0]),
Math.Max(a._x[1], b._x[1]),
Math.Max(a._x[2], b._x[2])
));
}
public static NuGenVec3F Cross(NuGenVec3F a, NuGenVec3F b)
{
return(new NuGenVec3F(
a.y * b.z - a.z * b.y,
a.z * b.x - a.x * b.z,
a.x * b.y - a.y * b.x
));
}
public override bool Equals(object obj)
{
NuGenVec3F x = (NuGenVec3F)obj;
return(
_x[0] == x._x[0] &&
_x[1] == x._x[1] &&
_x[2] == x._x[2]
);
}
public NuGenScale3F(NuGenVec3F shift)
{
v = shift;
}
public NuGenScale3F(float x, float y, float z)
{
v = new NuGenVec3F(x, y, z);
}
public NuGenRay3F(NuGenPnt3F p, NuGenVec3F v)
{
this.p = p;
this.v = v;
}
public NuGenShift3F(NuGenVec3F shift)
{
v = shift;
}
public NuGenShift3F(float x, float y, float z)
{
v = new NuGenVec3F(x, y, z);
}
public static float Dot(NuGenVec3F u, NuGenVec3F v)
{
return(u[0] * v[0] + u[1] * v[1] + u[2] * v[2]);
}
public NuGenRot3F(float radians, NuGenVec3F axis)
{
axis.Normalize();
r = (float)Math.Cos(radians / 2.0);
v = axis.Normalized * (float)Math.Sin(radians / 2.0);
}