/// <summary>
/// Build a texture coordinate transformation from the given parameters as specified in TextureTransform
/// http://gun.teipir.gr/VRML-amgem/spec/part1/nodesRef.html#TextureTransform
/// </summary>
public static Trafo2d BuildVrmlTextureTrafo(V2d center, double rotation, V2d scale, V2d translation)
{
M33d C = M33d.Translation(center), Ci = M33d.Translation(-center);
M33d R = M33d.Rotation(rotation), Ri = M33d.Rotation(-rotation);
M33d S = M33d.Scale(scale), Si = M33d.Scale(1 / scale);
M33d T = M33d.Translation(translation), Ti = M33d.Translation(-translation);
return(new Trafo2d(
Ci * S * R * C * T,
Ti * Ci * Ri * Si * C));
}
/// <summary>
/// Extracts texture transform from given node.
/// </summary>
public static Trafo2d ExtractVrmlTextureTrafo(this SymMapBase m)
{
if (m == null)
{
return(Trafo2d.Identity);
}
// get trafo parts
var c = (V2d)m.Get <V2f>(Vrml97Sym.center, V2f.Zero);
var r = (double)m.Get <float>(Vrml97Sym.rotation, 0.0f);
var s = (V2d)m.Get <V2f>(Vrml97Sym.scale, new V2f(1, 1));
var t = (V2d)m.Get <V2f>(Vrml97Sym.translation, V2f.Zero);
M33d C = M33d.Translation(c), Ci = M33d.Translation(-c);
M33d R = M33d.Rotation(r), Ri = M33d.Rotation(-r);
M33d S = M33d.Scale(s), Si = M33d.Scale(1 / s);
M33d T = M33d.Translation(t), Ti = M33d.Translation(-t);
return(new Trafo2d(
Ci * S * R * C * T,
Ti * Ci * Ri * Si * C));
}