public void At(Surface.Intersection intersection, ref Surface.Attributes attributes)
{
Triangle tri = triangles[intersection.PrimitiveID];
if (smoothNormals)
{
// barycentric interpolation
Vector smoothed = tri.V1.Normal * intersection.LocalU
+ tri.V2.Normal * intersection.LocalV
+ tri.V0.Normal * (1 - intersection.LocalU - intersection.LocalV);
attributes.Basis = new Basis(smoothed.Normalize());
}
else
{
attributes.Basis = new Basis(tri.FaceNormal);
}
}
public unsafe Boolean Intersect(Ray ray, float near, float far, out Surface.Intersection intersection)
{
var ptr = stackalloc byte[Marshal.SizeOf(typeof(Embree.RayStruct1))
+ Embree.RayStruct1.Alignment];
var rs = (Embree.RayStruct1 *)(Align(ptr, Embree.RayStruct1.Alignment));
rs->orgX = ray.Origin.X;
rs->orgY = ray.Origin.Y;
rs->orgZ = ray.Origin.Z;
rs->dirX = ray.Direction.X;
rs->dirY = ray.Direction.Y;
rs->dirZ = ray.Direction.Z;
rs->tnear = near;
rs->tfar = far;
rs->time = 0.0f;
rs->geomID = Embree.RTC.InvalidID;
rs->primID = Embree.RTC.InvalidID;
rs->instID = Embree.RTC.InvalidID;
rs->mask = 0xFFFFFFFF;
scene.Intersection(rs);
if (rs->geomID != Embree.RTC.InvalidID)
{
intersection = new Surface.Intersection()
{
Distance = rs->tfar,
SurfaceID = rs->instID,
PrimitiveID = rs->primID,
LocalU = rs->u,
LocalV = rs->v
};
return(true);
}
else
{
intersection = default(Surface.Intersection);
return(false);
}
}
public void At(Surface.Intersection intersection, ref Surface.Attributes attributes)
{
attributes.Material = Material;
}