private static Vector2 GenerateSphericalCoordiantesfor(Vector3 position, UVMappingTypes mapping)
{
Vector2 tex;
double u = 0.0;
double v = 0.0;
double x = position.X;
double y = position.Y;
double z = position.Z;
double r
= Math.Sqrt(Math.Pow(x, 2.0) + Math.Pow(y, 2.0) + Math.Pow(z, 2.0));
x /= r;
y /= r;
z /= r;
switch (mapping)
{
case UVMappingTypes.Spherical_Coordinates:
u = z >= 0 ? Math.Atan2(position.X, position.Z) : Math.Atan2(position.X, -position.Z);
v = Math.Acos(position.Y / r);
break;
case UVMappingTypes.Central:
u = x;
v = y;
break;
case UVMappingTypes.Stereographic:
u = z >= 0 ? x / (1 + z) : x / (1 - z);
v = z >= 0 ? y / (1 + z) : y / (1 - z);
break;
}
//TODO: Log to file
#if DEBUG
//if(u < 0.0 || u >1.0 || v < 0.0 || v > 1.0)
//Console.Error.WriteLine($"Texturecoordinates Out of Range - u:{u}, v:{v}");
#endif
tex.X = u.ToFloat();
tex.Y = v.ToFloat();
return(tex);
}
public static void GenerateSphericalTextureCoordinatesFor(Mesh <VertexPositionNormalTextureTangent> mesh, UVMappingTypes mapping)
{
var vertices = mesh.Vertices;
for (int i = 0; i < vertices.Length; i++)
{
vertices[i].TextureCoordinates = GenerateSphericalCoordiantesfor(vertices[i].Position, mapping);
}
}
