public static OrthoNormalBasis MakeFromW(Vector3D w)
{
OrthoNormalBasis onb = new OrthoNormalBasis();
w.Normalize();
onb.w = w;
if ((Math.Abs(onb.w.X) < Math.Abs(onb.w.Y)) && (Math.Abs(onb.w.X) < Math.Abs(onb.w.Z)))
{
onb.v.X = 0;
onb.v.Y = onb.w.Z;
onb.v.Z = -onb.w.Y;
}
else if (Math.Abs(onb.w.Y) < Math.Abs(onb.w.Z))
{
onb.v.X = onb.w.Z;
onb.v.Y = 0;
onb.v.Z = -onb.w.X;
}
else
{
onb.v.X = onb.w.Y;
onb.v.Y = -onb.w.X;
onb.v.Z = 0;
}
onb.v.Normalize();
onb.u = onb.v ^ onb.w;
return(onb);
}
public static OrthoNormalBasis MakeFromWV(Vector3D w, Vector3D v)
{
OrthoNormalBasis onb = new OrthoNormalBasis();
w.Normalize();
onb.w = w;
onb.u = onb.w ^ v;
onb.u.Normalize();
onb.v = (onb.w ^ onb.u);
return onb;
}
public static OrthoNormalBasis MakeFromWV(Vector3D w, Vector3D v)
{
OrthoNormalBasis onb = new OrthoNormalBasis();
w.Normalize();
onb.w = w;
onb.u = onb.w ^ v;
onb.u.Normalize();
onb.v = (onb.w ^ onb.u);
return(onb);
}
protected Camera(Point3D eye, Point3D lookAt, Vector3D up, float fov, float resX, float resY)
{
this.ResX = resX;
this.ResY = resY;
this.aspect = resX / resY;
this.eye = eye;
this.Fov = fov;
this.up = up;
this.LookAt = lookAt;
this.basis = OrthoNormalBasis.MakeFromWV(eye - lookAt, up);
this.au = (float) Math.Tan(fov * 0.5f);
this.av = this.au * 1.0f / this.aspect;
}
public static OrthoNormalBasis MakeFromW(Vector3D w)
{
OrthoNormalBasis onb = new OrthoNormalBasis();
w.Normalize();
onb.w = w;
if ((Math.Abs(onb.w.X) < Math.Abs(onb.w.Y)) && (Math.Abs(onb.w.X) < Math.Abs(onb.w.Z))) {
onb.v.X = 0;
onb.v.Y = onb.w.Z;
onb.v.Z = -onb.w.Y;
} else if (Math.Abs(onb.w.Y) < Math.Abs(onb.w.Z)) {
onb.v.X = onb.w.Z;
onb.v.Y = 0;
onb.v.Z = -onb.w.X;
} else {
onb.v.X = onb.w.Y;
onb.v.Y = -onb.w.X;
onb.v.Z = 0;
}
onb.v.Normalize();
onb.u = onb.v ^ onb.w;
return onb;
}
