Vec6f GatherTreeBuilder::_ComputeKdPoint( mdGatherPoint &gp )
{
CompositedBRDF brdfs;
// isect.Ns is modified in the shade function although it has been already set
Vector3f ns = gp.isect.Ns;
if (gp.isect.material) gp.isect.material->shade(Ray(), Medium::Vacuum(), gp.isect, brdfs);
gp.isect.Ns = ns;
float n=0;
Color kd(zero),ks(zero);
brdfs.getPhong(kd,ks,n);
Vector3f direction;
if (ks!=zero && n!=0.0f)
{
float scale = 0.0f;
if(n < 20.0f)
scale = 1.0f;
else if(n < 40.0f)
scale = 2.0f;
else if(n < 80.0f)
scale = 3.0f;
else
scale = 4.0f;
direction = (- gp.wo + gp.isect.Ns* 2*dot(gp.wo, gp.isect.Ns) ) * scale * _normalScale;
}
else
direction = gp.isect.Ns * _normalScale;
return Vec6f(gp.isect.P, direction);
}
GatherNode* GatherTreeBuilder::_MakeLeaf( vector<GpKdItem>::iterator it, vector<mdGatherPoint> &points)
{
GatherNode *node = new GatherNode();
mdGatherPoint &gp = points[it->idx];
// the shading normal has been already computed, so restore it
Vector3f ns = gp.isect.Ns;
CompositedBRDF brdfs;
if (gp.isect.material) gp.isect.material->shade(Ray(), Medium::Vacuum(), gp.isect, brdfs);
gp.isect.Ns = ns;
float n=0;
Color kd(zero),ks(zero);
brdfs.getPhong(kd,ks,n);
node->gp = &gp;
node->strength = 1.0f / _samples;
node->hasGlossy = false;
node->bbox = BBox3f(gp.isect.P, gp.isect.P);
node->emission = gp.emission;
node->kd = kd;
node->ks = ks;
node->n = n;
if(zero != kd)
node->normalCone = FastConef(gp.isect.Ns);
if (zero != ks && n > 0.0f)
{
node->hasGlossy = true;
node->mirrorCone = FastConef(- gp.wo + gp.isect.Ns* 2*dot(gp.wo, gp.isect.Ns) );
}
return node;
}
