private vec3[] ArrangeNormals(ObjVNFContext context)
{
var normals = new vec3[context.vertexCount];
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] normalIndexes = (from item in face.NormalIndexes() select item).ToArray();
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
if (normalIndexes.Length != vertexIndexes.Length)
{
throw new Exception(string.Format(
"normalIndexes.Length [{0}] != vertexIndexes.Length [{1}]!",
normalIndexes.Length, vertexIndexes.Length));
}
for (int t = 0; t < vertexIndexes.Length; t++)
{
normals[vertexIndexes[t]] = mesh.normals[normalIndexes[t]];
}
}
return(normals);
}
/// <summary>
/// Reads mesh's vertex count, normal count and face count.
/// </summary>
/// <param name="context"></param>
public override void Parse(ObjVNFContext context)
{
int triangleFaceCount = 0;
ObjVNFMesh mesh = context.Mesh;
for (int i = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
uint[] normalIndexes = (from item in face.NormalIndexes() select item).ToArray();
uint[] vertexIndexes = (from item in face.VertexIndexes() select item).ToArray();
if (normalIndexes.Length != vertexIndexes.Length)
{
throw new Exception(string.Format(
"normalIndexes.Length [{0}] != vertexIndexes.Length [{0}]!",
normalIndexes.Length, vertexIndexes.Length));
}
if (face is ObjVNFTriangle)
{
triangleFaceCount++;
}
else if (face is ObjVNFQuad)
{
triangleFaceCount += 2;
}
}
if (triangleFaceCount != context.faceCount)
{
var faces = new ObjVNFTriangle[triangleFaceCount];
for (int i = 0, j = 0; i < context.faceCount; i++)
{
ObjVNFFace face = mesh.faces[i];
if (face is ObjVNFTriangle)
{
faces[j++] = face as ObjVNFTriangle;
}
else if (face is ObjVNFQuad)
{
var quad = face as ObjVNFQuad;
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[1], quad.vertexIndexes[2],
quad.normalIndexes[0], quad.normalIndexes[1], quad.normalIndexes[2],
quad.texCoordIndexes[0], quad.texCoordIndexes[1], quad.texCoordIndexes[2]);
faces[j++] = new ObjVNFTriangle(
quad.vertexIndexes[0], quad.vertexIndexes[2], quad.vertexIndexes[3],
quad.normalIndexes[0], quad.normalIndexes[2], quad.normalIndexes[3],
quad.texCoordIndexes[0], quad.texCoordIndexes[2], quad.texCoordIndexes[3]);
}
}
mesh.faces = faces;
context.faceCount = triangleFaceCount;
}
}
