public Ray GenerateRay(LocalGeo geo, out RTColor color)
{
color = Color;
RTVector ray = Source - geo.Point;
return(new Ray(geo.Point, ray.Normalize(), 1e-3f, ray.Length, false));
}
private RTColor Shading(LocalGeo geo, ShadingInfos si, Ray camRay, Ray lightRay, RTColor lightCol)
{
float nDotL = RTVector.DotProduct(geo.Normal, lightRay.Vector);
RTColor lambert = lightCol * si.Diffuse * (nDotL > 0 ? nDotL : 0.0f);
RTVector half = (lightRay.Vector - camRay.Vector.Normalize()).Normalize();
float nDotH = RTVector.DotProduct(geo.Normal, half);
RTColor phong = lightCol * si.Specular * (float)Math.Pow((nDotH > 0 ? nDotH : 0.0f), si.Shininess);
float r = lightRay.Directional ? 0 : lightRay.TMax; // Dans le cas d'un point, le t max est la distance entre le point et la source
RTColor res = (lambert + phong) / (Attenuation.Constant + Attenuation.Linear * r + Attenuation.Quadratic * (float)Math.Pow(r, 2));
return(res);
}
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);
}
public bool Intersect(Ray ray, bool computeGeo, out LocalGeo geo, out float t)
{
return(Shape.Intersect(ray, computeGeo, out geo, out t));
}
public ShadingInfos GetShading(LocalGeo geo)
{
return(Material.GetShading(geo));
}
public bool Intersect(Ray ray, bool computeGeo, out LocalGeo geo, out float t)
{
RTPoint tPoint = Transformation.ApplyInverseTo(new RTPoint(ray.Point.X, ray.Point.Y, ray.Point.Z));
RTVector tVec = Transformation.ApplyInverseTo(new RTVector(ray.Vector.X, ray.Vector.Y, ray.Vector.Z));
RTVector ec = tPoint - Center;
float a = RTVector.DotProduct(tVec, tVec);
float b = 2.0f * RTVector.DotProduct(tVec, ec);
float c = RTVector.DotProduct(ec, ec) - (float)Math.Pow(Radius, 2);
float det = (float)Math.Pow(b, 2) - 4.0f * a * c;
t = float.MaxValue;
bool intersect = false;
if (det == 0d)
{
intersect = true;
t = -b / (2.0f * a);
}
else if (det > 0d)
{
float t1 = (-b + (float)Math.Sqrt(det)) / (2.0f * a);
float t2 = (-b - (float)Math.Sqrt(det)) / (2.0f * a);
if ((t1 > 0 && t2 < 0) || (t1 < 0 && t2 > 0))
{
intersect = true;
if (t1 > 0)
{
t = t1;
}
else
{
t = t2;
}
}
else if (t1 > 0 && t2 > 0)
{
intersect = true;
if (t1 < t2)
{
t = t1;
}
else
{
t = t2;
}
}
}
geo = new LocalGeo();
if (intersect && t >= ray.TMin && t <= ray.TMax)
{
if (computeGeo)
{
geo.Point = tPoint + t * tVec;
geo.Normal = new Normal(geo.Point - Center);
geo.Point = Transformation.ApplyTo(geo.Point);
geo.Normal = new Normal(Transformation.ApplyInverseTransposeTo(geo.Normal));
}
return(true);
}
return(false);
}
public ShadingInfos GetShading(LocalGeo geo)
{
return(Properties);
}
public Ray GenerateRay(LocalGeo geo, out RTColor color)
{
color = Color;
return(new Ray(geo.Point, Direction.Normalize(), 1e-3f, float.MaxValue, true));
}