public void AddVertexNormals()
{
foreach (var face in this.Meshes.SelectMany(t => t.FaceGroups).SelectMany(t => t.Faces))
{
ObjIndex verticesIndex = face.VerticesIndex;
ObjIndex vertexNormalsIndex = face.VertexNormalsIndex;
if (vertexNormalsIndex.A < 0 || vertexNormalsIndex.B < 0 || vertexNormalsIndex.C < 0 || (verticesIndex.D >= 0 && vertexNormalsIndex.D < 0))
{
ObjVector3 normal = ObjVector3.Normal(
this.Vertices.ElementAtOrDefault(verticesIndex.A),
this.Vertices.ElementAtOrDefault(verticesIndex.B),
this.Vertices.ElementAtOrDefault(verticesIndex.C));
this.VertexNormals.Add(normal);
vertexNormalsIndex.A = this.VertexNormals.Count - 1;
vertexNormalsIndex.B = this.VertexNormals.Count - 1;
vertexNormalsIndex.C = this.VertexNormals.Count - 1;
vertexNormalsIndex.D = verticesIndex.D < 0 ? -1 : this.VertexNormals.Count - 1;
face.VertexNormalsIndex = vertexNormalsIndex;
}
}
}
private void CompactVertexNormalsBuffer()
{
if (this.VertexNormals.Count == 0)
{
return;
}
bool[] isUsed = new bool[this.VertexNormals.Count];
foreach (int i in this.Meshes
.SelectMany(t => t.FaceGroups)
.SelectMany(t => t.Faces)
.Select(t => t.VertexNormalsIndex)
.SelectMany(t => new int[] { t.A, t.B, t.C, t.D }))
{
if (i >= 0 && i < this.VertexNormals.Count)
{
isUsed[i] = true;
}
}
List <ObjVector3> newValues = new List <ObjVector3>(this.VertexNormals.Count);
int[] newIndices = new int[this.VertexNormals.Count];
for (int i = 0; i < this.VertexNormals.Count; i++)
{
if (!isUsed[i])
{
continue;
}
ObjVector3 value = this.VertexNormals[i];
int index = -1;
for (int j = 0; j < newValues.Count; j++)
{
if (newValues[j] == value)
{
index = j;
break;
}
}
if (index == -1)
{
newIndices[i] = newValues.Count;
newValues.Add(value);
}
else
{
newIndices[i] = index;
}
}
newValues.TrimExcess();
this.VertexNormals = newValues;
foreach (var face in this.Meshes
.SelectMany(t => t.FaceGroups)
.SelectMany(t => t.Faces))
{
ObjIndex index = face.VertexNormalsIndex;
face.VertexNormalsIndex = new ObjIndex(
index.A < 0 ? -1 : newIndices[index.A],
index.B < 0 ? -1 : newIndices[index.B],
index.C < 0 ? -1 : newIndices[index.C],
index.D < 0 ? -1 : newIndices[index.D]);
}
}