private void BuildGeometry(SceneMeshData SceneData, SceneMeshEntity[] sceneMesh, bool hasAreaLights = false, IEnumerable<SceneLightsource> areaLights = null)
{
topObject = new GeometryGroup(Session.OptixContext);
Session.OptixContext["scene_sphere_radius"].Set(SceneData.BoundingSphereRadius);
Session.OptixContext["scene_sphere_center"].SetFloat3(SceneData.BoundingSphereCenter);
var vDesc = new BufferDesc { Width = (uint)SceneData.Positions.Count, Format = Format.Float3, Type = BufferType.Input };
var nDesc = new BufferDesc { Width = (uint)SceneData.Normals.Count, Format = Format.Float3, Type = BufferType.Input };
var tcDesc = new BufferDesc { Width = (uint)SceneData.TexCoords.Count, Format = Format.Float2, Type = BufferType.Input };
var vBuffer = new Buffer(Session.OptixContext, vDesc);
var nBuffer = new Buffer(Session.OptixContext, nDesc);
var tcBuffer = new Buffer(Session.OptixContext, tcDesc);
vBuffer.SetData(SceneData.Positions.ToArray());
nBuffer.SetData(SceneData.Normals.ToArray());
tcBuffer.SetData(SceneData.TexCoords.ToArray());
var lightTriangleIndexes = new Dictionary<string, List<int>>(StringComparer.InvariantCultureIgnoreCase);
var instances = new List<GeometryInstance>();
var triLights = new List<TriangleLight>();
int idx = 0;
foreach (var group in sceneMesh)
{
//empty group
if (group.VertexIndexes.Count == 0 && group.NormalIndexes.Count == 0 && group.TextureIndexes.Count == 0)
continue;
var center = new Vector3();
foreach (var vi in group.VertexIndexes)
{
center += SceneData.Positions[vi.X];
center += SceneData.Positions[vi.Y];
center += SceneData.Positions[vi.Z];
center /= 3.0f;
}
//ValidateGroup( group );
//var mat = this.ResolveMaterial(group.Material);
bool normalsUseVIndices = GenerateNormals && group.NormalIndexes.Count == 0 && SceneData.Normals.Count > 0;
if (normalsUseVIndices)
Debug.Assert(SceneData.Normals.Count == SceneData.Positions.Count);
int numNormIndices = normalsUseVIndices ? group.VertexIndexes.Count : group.NormalIndexes.Count;
var viDesc = new BufferDesc() { Width = (uint)group.VertexIndexes.Count, Format = Format.Int3, Type = BufferType.Input };
var niDesc = new BufferDesc() { Width = (uint)numNormIndices, Format = Format.Int3, Type = BufferType.Input };
var tiDesc = new BufferDesc() { Width = (uint)group.TextureIndexes.Count, Format = Format.Int3, Type = BufferType.Input };
var viBuffer = new Buffer(Session.OptixContext, viDesc);
var niBuffer = new Buffer(Session.OptixContext, niDesc);
var tiBuffer = new Buffer(Session.OptixContext, tiDesc);
viBuffer.SetData(group.VertexIndexes.ToArray());
niBuffer.SetData(normalsUseVIndices ? group.VertexIndexes.ToArray() : group.NormalIndexes.ToArray());
tiBuffer.SetData(group.TextureIndexes.ToArray());
var geometry = new Geometry(Session.OptixContext);
string intersect_program = "mesh_intersect";
string isect_script = IntersectionScript;
//if (!string.IsNullOrWhiteSpace(group.mtrl) && matTypes.ContainsKey(group.mtrl))
//{
// if (matTypes[group.mtrl].Equals("Volume"))
// {
// intersect_program = "volume_mesh_intersect";
// isect_script = GetScript("triangle_mesh_iterative.ptx");
// }
//}
geometry.IntersectionProgram = new Program(Session.OptixContext, isect_script, intersect_program);
geometry.BoundingBoxProgram = new Program(Session.OptixContext, isect_script, "mesh_bounds");
geometry.PrimitiveCount = (uint)group.VertexIndexes.Count;
geometry["vertex_buffer"].Set(vBuffer);
geometry["normal_buffer"].Set(nBuffer);
geometry["texcoord_buffer"].Set(tcBuffer);
geometry["vindex_buffer"].Set(viBuffer);
geometry["nindex_buffer"].Set(niBuffer);
geometry["tindex_buffer"].Set(tiBuffer);
var instance = new GeometryInstance(Session.OptixContext);
instance.Geometry = geometry;
instance["geometric_center"].SetFloat3(center);
//instance.AddMaterial(mat);
group.EngineEntity = geometry;
if (group.Material != null)
{
int lindex;
if (hasAreaLights && MeshIsLight(group.Name, out lindex))
{
instance.AddMaterial(this.GetLightMaterial(group.Material, lindex));
}
else
{
var mtrl = ResolveMaterial(group.Material);
if (mtrl != null)
{
group.Material.EngineEntity = mtrl;
instance.AddMaterial(mtrl);
SetDefaultMaterialProperties(instance, mtrl, group.Material);
}
else
{
Tracer.WriteLine("Mesh {0} missed material {1}", group.Name, group.Material.Name);
}
}
}
else
{
Tracer.WriteLine("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ----Mesh {0} missed material {1}", group.Name, group.Material);
Console.ReadLine();
}
//if (!string.IsNullOrWhiteSpace(LightNameTemplate))
//{
// Regex lightReg = new Regex(LightNameTemplate, RegexOptions.IgnoreCase);
// if (lightReg.IsMatch(group.Name))
// {
// var lt = new Lightsource()
// {
// Type = LightSourceTypes.Area,
// Emission = Scene.LightGain,
// Name = group.Name,
// };
// lt[Lightsource.AreaMeshName] = group.Name;
// Scene.Lights = Scene.Lights.Union(new[] { lt }).ToArray();
// }
//}
if (hasAreaLights)
{
var light =
areaLights.FirstOrDefault(
lt => lt.Name.Equals(group.Name, StringComparison.InvariantCultureIgnoreCase));
// SetDefaultLightProperties(instance, light);
if (light != null)
{
var ti = new List<int>();
lightTriangleIndexes.Add(group.Name, ti);
for (int index = 0; index < group.VertexIndexes.Count; index++)
{
var vIndex = group.VertexIndexes[index];
var v1 = SceneData.Positions[vIndex.X];
var v2 = SceneData.Positions[vIndex.Y];
var v3 = SceneData.Positions[vIndex.Z];
var e1 = v2 - v3;
var e2 = v1 - v3;
Vector3 n = Vector3.Cross(ref e1, ref e2);//SceneGraph.LightOrientation *
if (group.NormalIndexes.Any())
{
n = (SceneData.Normals[group.NormalIndexes[index].X]);//Scene.LightOrientation *
}
n.Normalize();
ti.Add(idx + 1);
triLights.Add(new TriangleLight()
{
color = light.Color, //Emission * emissionScale,
v1 = v1,
v2 = v2,
v3 = v3,
normal = n,
idx = idx++
});
}
}
}
instances.Add(instance);
}
var Builder = AccelBuilder.Sbvh;
var Traverser = AccelTraverser.Bvh;
//create an acceleration structure for the geometry
var accel = new Acceleration(Session.OptixContext, Builder, Traverser);
if (Builder == AccelBuilder.Sbvh || Builder == AccelBuilder.TriangleKdTree)
{
accel.VertexBufferName = "vertex_buffer";
accel.IndexBufferName = "vindex_buffer";
}
//now attach the instance and accel to the geometry group
topObject.Acceleration = accel;
topObject.AddChildren(instances);
topObject.Acceleration.MarkAsDirty();
BuildCache.Add("LightTrianglesIndexes", lightTriangleIndexes);
BuildCache.Add("LightTriangles", triLights);
}