public static Tuple <List <NVRVertex>, List <int> > GetGeometryFromOBJ(OBJFile objFile)
{
List <NVRVertex> vertices = new List <NVRVertex>();
List <int> indices = new List <int>();
// We first add all the vertices in a list.
List <NVRVertex> objVertices = new List <NVRVertex>();
foreach (Vector3 position in objFile.Vertices)
{
objVertices.Add(new NVRVertex8(position));
}
foreach (OBJFace face in objFile.Faces)
{
for (int i = 0; i < 3; i++)
{
NVRVertex8 position = (NVRVertex8)objVertices[(int)face.VertexIndices[i]];
Vector2 UV = new Vector2(0, 0);
if (objFile.UVs.Count > 0)
{
UV = objFile.UVs[(int)face.UVIndices[i]];
}
Vector3 normal = new Vector3(0, 0, 0);
if (objFile.Normals.Count > 0)
{
normal = objFile.Normals[(int)face.NormalIndices[i]];
}
if ((position.UV != null && position.Normal != null) && (!position.UV.Equals(UV) || !position.Normal.Equals(normal)))
{
// Needs to replicate
position = new NVRVertex8(position.Position);
}
position.UV = UV;
position.Normal = normal;
position.DiffuseColor = new Color(0, 0, 0, 255);
position.EmissiveColor = new Color(0.5f, 0.5f, 0.5f, 1f);
int vertexIndex = vertices.IndexOf(position);
if (vertexIndex == -1)
{
vertexIndex = vertices.Count;
vertices.Add(position);
}
indices.Add(vertexIndex);
}
}
//for (int i = 0; i < indices.Count; i += 3)
//{
// NVRVertex8 v1 = (NVRVertex8)vertices[indices[i]];
// NVRVertex8 v2 = (NVRVertex8)vertices[indices[i + 1]];
// NVRVertex8 v3 = (NVRVertex8)vertices[indices[i + 2]];
// Vector3 faceNormal = CalcNormal(v1.Position, v2.Position, v3.Position);
// v1.Normal = v1.Normal + faceNormal;
// v2.Normal = v2.Normal + faceNormal;
// v3.Normal = v3.Normal + faceNormal;
//}
//foreach (NVRVertex8 vert in vertices)
//{
// float length = (float)Math.Sqrt(Math.Pow(vert.Normal.X, 2) + Math.Pow(vert.Normal.Y, 2) + Math.Pow(vert.Normal.Z, 2));
// vert.Normal.X = vert.Normal.X / length;
// vert.Normal.Y = vert.Normal.Y / length;
// vert.Normal.Z = vert.Normal.Z / length;
//}
return(new Tuple <List <NVRVertex>, List <int> >(vertices, indices));
}