/// <summary>
/// Recorre todo el arbol CSG hasta llegar a las primitivas y va actalizando la matriz de mundo para soportar jerarquia de transformaciones.
/// </summary>
private IEnumerable<DrawableElement> GetElementsFrom(Graphic graphic, mat4x4 currentWorld)
{
if (graphic is ModelGraphic)
yield return new DrawableElement() { Model = graphic as ModelGraphic, World = currentWorld };
if (graphic is TransformedGraphic)
foreach (var innerelement in GetElementsFrom(((TransformedGraphic)graphic).Graphic, ((TransformedGraphic)graphic).Transform * currentWorld))
yield return innerelement;
if (graphic is CSGGraphic)
{
CSGGraphic csg = graphic as CSGGraphic;
if (csg.Operation == CSGOperation.Union)
{
foreach (var innerelement in GetElementsFrom(csg.LeftOperand, currentWorld))
yield return innerelement;
foreach (var innerelement in GetElementsFrom(csg.RightOperand, currentWorld))
yield return innerelement;
}
else
throw new NotSupportedException(); /// Not supported full CSG in zBuffering. (Bonus for implementation).
}
}
public Ray Transformed(mat4x4 transform)
{
return Ray.FromTo((vec3)(new vec4(this.From,1) * transform), (vec3)(new vec4(this.From + this.Direction, 1) * transform));
}
internal TransformedGraphic(Graphic graphic, mat4x4 transform)
{
this.Graphic = graphic;
this.Transform = transform;
}
