public Hit Trace(Ray ray)
{
var minHit = TinyEmbreeCore.TraceSingle(sceneId, ray);
if (minHit.meshId == uint.MaxValue)
{
return(new Hit());
}
Hit hit = new Hit {
BarycentricCoords = new Vector2(minHit.u, minHit.v),
Distance = minHit.distance,
Mesh = meshMap[minHit.meshId],
PrimId = minHit.primId
};
// Compute the position and face normal from the barycentric coordinates
hit.Position = hit.Mesh.ComputePosition((int)hit.PrimId, hit.BarycentricCoords);
hit.Normal = hit.Mesh.FaceNormals[hit.PrimId];
// Compute the error offset (formula taken from Embree example renderer)
hit.ErrorOffset = Math.Max(
Math.Max(Math.Abs(hit.Position.X), Math.Abs(hit.Position.Y)),
Math.Max(Math.Abs(hit.Position.Z), hit.Distance)
) * 32.0f * 1.19209e-07f;
return(hit);
}
public void AddMesh(TriangleMesh mesh)
{
uint meshId = (uint)TinyEmbreeCore.AddTriangleMesh(sceneId, mesh.Vertices, mesh.NumVertices,
mesh.Indices, mesh.NumFaces * 3);
meshMap[meshId] = mesh;
}
void Free()
{
if (scene != IntPtr.Zero)
{
TinyEmbreeCore.DeleteScene(scene);
scene = IntPtr.Zero;
}
}
public Raytracer()
{
sceneId = TinyEmbreeCore.InitScene();
}
public void CommitScene()
{
TinyEmbreeCore.FinalizeScene(sceneId);
}
/// <summary>
/// Builds the acceleration structure
/// </summary>
public void CommitScene()
{
TinyEmbreeCore.FinalizeScene(scene);
isReady = true;
}
