private void RemoveFaceInternal(FaceEntry faceEntry)
{
foreach (var v in faceEntry.Vertices)
{
v.Faces.Remove(faceEntry);
}
foreach (var e in faceEntry.Edges)
{
e.Faces.Remove(faceEntry);
}
}
private void Update(EvaluationContext context)
{
var resourceManager = ResourceManager.Instance();
string path = Path.GetValue(context);
var mesh = ObjMesh.LoadFromFile(path);
if (mesh == null)
{
Log.Warning($"Could not load {path}");
return;
}
float areaSum = 0.0f;
int numVertexEntries = mesh.Faces.Count;
var faceBufferData = new FaceEntry[numVertexEntries];
for (int i = 0, faceIndex = 0; faceIndex < mesh.Faces.Count; faceIndex++)
{
var face = mesh.Faces[faceIndex];
// calc area of triangle
Vector3 v0 = mesh.Positions[face.V0];
Vector3 v1 = mesh.Positions[face.V1];
Vector3 v2 = mesh.Positions[face.V2];
Vector3 baseDir = (v1 - v0);
float a = baseDir.Length();
baseDir.Normalize();
Vector3 heightStart = v0 + Vector3.Dot(v2 - v0, baseDir) * baseDir;
float b = (v2 - heightStart).Length();
float faceArea = a * b * 0.5f;
areaSum += faceArea;
faceBufferData[i].Pos0 = v0;
faceBufferData[i].Pos1 = v1;
faceBufferData[i].Pos2 = v2;
faceBufferData[i].Normal0 = mesh.Normals[face.V0n];
faceBufferData[i].Normal1 = mesh.Normals[face.V1n];
faceBufferData[i].Normal2 = mesh.Normals[face.V2n];
faceBufferData[i].TexCoord0 = mesh.TexCoords[face.V0t];
faceBufferData[i].TexCoord1 = mesh.TexCoords[face.V1t];
faceBufferData[i].TexCoord2 = mesh.TexCoords[face.V2t];
faceBufferData[i].FaceArea = faceArea;
i++;
}
// normalize face area to 1
float sumReci = 1.0f / areaSum;
float cdf = 0.0f;
for (int i = 0; i < faceBufferData.Length; i++)
{
cdf += faceBufferData[i].FaceArea * sumReci;
faceBufferData[i].Cdf = cdf;
}
int stride = 108;
resourceManager.SetupStructuredBuffer(faceBufferData, stride * numVertexEntries, stride, ref Buffer);
Buffer.DebugName = nameof(PointCloudFromObj);
resourceManager.CreateStructuredBufferSrv(Buffer, ref PointCloudSrv.Value);
}
