public TriangleShape(PosVector position, PosVector vb, PosVector vc, BaseMaterial frontMaterial,
BaseMaterial backMaterial) : base(position)
{
VB = vb;
VC = vc;
_frontMaterial = frontMaterial;
_backMaterial = backMaterial;
EdgeAb = VB - VA;
EdgeBc = VC - VB;
EdgeCa = VA - VC;
Normal = EdgeAb.Dot(EdgeBc) < EdgeBc.Dot(EdgeCa) ? EdgeAb.Cross(EdgeBc) : EdgeBc.Cross(EdgeCa);
Magnitude = Normal.Magnitude();
if (Magnitude > 0.0)
{
Normal = Normal / Magnitude; // unit vector to triangle plane
}
PlaneCoefficient = Normal.Dot(VA); // same coeff for all three vertices
var a = EdgeAb.MagnitudeSquared();
var b = EdgeAb.Dot(EdgeCa);
var c = EdgeCa.MagnitudeSquared();
var dinv = 1.0 / (a * c - b * b);
a = a * dinv;
b = b * dinv;
c = c * dinv;
Ubeta = (EdgeAb * c).AddScaled(EdgeCa, -b);
Ugamma = (EdgeCa * -a).AddScaled(EdgeAb, b);
}
public SphereShape(PosVector position, double radius, BaseMaterial material) : base(position)
{
Radius = radius;
_material = material;
}