public HitTriangle(Vertex3D[] rgv, ItemType itemType, IItem item) : base(itemType, item)
{
Rgv = rgv;
/* NB: due to the swapping of the order of e0 and e1,
* the vertices must be passed in counterclockwise order
* (but rendering uses clockwise order!)
*/
var e0 = Rgv[2].Clone().Sub(Rgv[0]);
var e1 = Rgv[1].Clone().Sub(Rgv[0]);
Normal = Vertex3D.CrossProduct(e0, e1);
Normal.NormalizeSafe();
Elasticity = 0.3f;
SetFriction(0.3f);
Scatter = 0;
}