private static Embree.TriangleMesh LoadFromFileIntoScene(String path, Embree.Scene scene, out IList <Embree.Vertex> vertexData, out IList <Embree.Triangle> triData)
{
vertexData = new List <Embree.Vertex>();
triData = new List <Embree.Triangle>();
// load the geometry from the .obj file (basic OBJ loader)
foreach (var line in File.ReadLines(path))
{
var tokens = line.Split();
switch (tokens[0])
{
case "v":
vertexData.Add(new Embree.Vertex {
X = float.Parse(tokens[1], CultureInfo.InvariantCulture),
Y = float.Parse(tokens[2], CultureInfo.InvariantCulture),
Z = float.Parse(tokens[3], CultureInfo.InvariantCulture),
});
break;
case "f":
triData.Add(new Embree.Triangle {
V0 = int.Parse(tokens[1].Split('/')[0]) - 1,
V1 = int.Parse(tokens[2].Split('/')[0]) - 1,
V2 = int.Parse(tokens[3].Split('/')[0]) - 1,
});
break;
}
}
var mesh = scene.NewTriangleMesh(new Embree.TriangleMeshDescription()
{
NumVertices = vertexData.Count,
NumTriangles = triData.Count,
Flags = Embree.GeometryFlags.Static,
LinearMotion = false,
});
mesh.SetVertices(vertexData.ToArray());
mesh.SetTriangles(triData.ToArray());
return(mesh);
}
public SimpleMesh(String filePath, Boolean smoothNormals)
{
scene = new Embree.Scene(Embree.SceneFlags.Coherent
| Embree.SceneFlags.Incoherent
| Embree.SceneFlags.Robust);
IList <Embree.Vertex> vertexData;
IList <Embree.Triangle> triData;
LoadFromFileIntoScene(filePath, scene, out vertexData, out triData);
scene.Commit();
// convert geometric vertex/triangle data into our own internal triangle format
this.triangles = new Triangle[triData.Count];
for (int t = 0; t < triData.Count; ++t)
{
triangles[t].V0.VertexID = triData[t].V0;
triangles[t].V1.VertexID = triData[t].V1;
triangles[t].V2.VertexID = triData[t].V2;
triangles[t].FaceNormal = Vector.Normalize(Vector.Cross(
(Point)vertexData[triData[t].V1] - (Point)vertexData[triData[t].V0],
(Point)vertexData[triData[t].V2] - (Point)vertexData[triData[t].V0]
));
}
// if we want smooth vertex normals, generate them here
// (note: we could load them from the .obj file if available, but never mind that for now)
this.smoothNormals = smoothNormals;
if (smoothNormals)
{
GenerateVertexNormals(vertexData);
}
}
public Scene()
{
scene = new Embree.Scene(Embree.SceneFlags.Coherent
| Embree.SceneFlags.Incoherent
| Embree.SceneFlags.Robust);
}