Triangulation:

- FEATURE: Concave polygons are now triangulated correctly.
 - internal face order is ccw now, flipwinding part of converttolh flag
 - added test files for the various formats supporting such polygons

FindDegenerates: 
 - improved behaviour when processing polygons, more tolerant.

Obj: 
 - material files are now properly read using the given IOSystem 
 - redirecting some std::cerr calls to our logger 
 - spaces and tabs are now allowed at the beginning of a line 

Viewer: 
 - max smoothing angle for normals is set to 90 deg now

vc9-workspace 
 - added assimp_cmd, renamed some virtual folders to be sexier.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@374 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/FindDegenerates.cpp

@@ -100,7 +100,7 @@ void FindDegeneratesProcess::ExecuteOnMesh( aiMesh* mesh)
 	if (configRemoveDegenerates)
 		remove_me.resize(mesh->mNumFaces,false);
 
-	unsigned int deg = 0;
+	unsigned int deg = 0, limit;
 	for (unsigned int a = 0; a < mesh->mNumFaces; ++a)
 	{
 		aiFace& face = mesh->mFaces[a];
@@ -109,13 +109,20 @@ void FindDegeneratesProcess::ExecuteOnMesh( aiMesh* mesh)
 		// check whether the face contains degenerated entries
 		for (register unsigned int i = 0; i < face.mNumIndices; ++i)
 		{
-			for (register unsigned int t = i+1; t < face.mNumIndices; ++t)
+			// Polygons with more than 4 points are allowed to have double points, that is
+			// simulating polygons with holes just with concave polygons. However,
+			// double points may not come directly after another.
+			limit = face.mNumIndices;
+			if (face.mNumIndices > 4)
+				limit = std::min(limit,i+2);
+
+			for (register unsigned int t = i+1; t < limit; ++t)
 			{
 				if (mesh->mVertices[face.mIndices[i]] == mesh->mVertices[face.mIndices[t]])
 				{
 					// we have found a matching vertex position
 					// remove the corresponding index from the array
-					--face.mNumIndices;
+					--face.mNumIndices;--limit;
 					for (unsigned int m = t; m < face.mNumIndices; ++m)
 					{
 						face.mIndices[m] = face.mIndices[m+1];