public void MoveCamera(RTPoint lookFrom, RTPoint lookAt, RTVector up)
{
Eye = new RTPoint(lookFrom);
W = (lookFrom - lookAt).Normalize();
U = RTVector.CrossProduct(up, W).Normalize();
V = RTVector.CrossProduct(W, U);
}
public bool Intersect(Ray ray, bool computeGeo, out LocalGeo geo, out float pos)
{
RTPoint A = Vertices[0].Location;
RTPoint B = Vertices[1].Location;
RTPoint C = Vertices[2].Location;
RTVector p0 = new RTVector(ray.Point);
pos = RTVector.DotProduct(A - ray.Point, Normal) / RTVector.DotProduct(ray.Vector, Normal);
geo = new LocalGeo();
if (pos >= ray.TMin && pos <= ray.TMax)
{
geo.Point = ray.Point + pos * ray.Vector;
geo.Normal = Normal;
RTVector u = B - A;
RTVector v = C - A;
RTVector w = geo.Point - A;
RTVector vCrossW = RTVector.CrossProduct(v, w);
RTVector vCrossU = RTVector.CrossProduct(v, u);
if (RTVector.DotProduct(vCrossW, vCrossU) < 0)
{
return(false);
}
RTVector uCrossW = RTVector.CrossProduct(u, w);
RTVector uCrossV = RTVector.CrossProduct(u, v);
if (RTVector.DotProduct(uCrossW, uCrossV) < 0)
{
return(false);
}
float denom = uCrossV.Length;
float r = vCrossW.Length / denom;
float t = uCrossW.Length / denom;
return(r + t <= 1);
}
return(false);
}
private Normal ComputeNormal()
{
Normal res;
bool normVertex = Vertices[0].Normal != null;
if (normVertex)
{
// TODO
res = new Normal(0, 1, 0);
}
else
{
RTPoint A = Vertices[0].Location;
RTPoint B = Vertices[1].Location;
RTPoint C = Vertices[2].Location;
RTVector U = B - A;
RTVector V = C - A;
res = new Normal(RTVector.CrossProduct(U, V));
}
return(res);
}
