Merge pull request #4226 from umlaeute/bugfix/import-crashes

Bugfix/import crashes

code/AssetLib/LWO/LWOLoader.cpp

@@ -393,7 +393,7 @@ void LWOImporter::InternReadFile(const std::string &pFile,
 
                             // If a RGB color map is explicitly requested delete the
                             // alpha channel - it could theoretically be != 1.
-                            if (_mSurfaces[i].mVCMapType == AI_LWO_RGB)
+                            if (_mSurfaces[j].mVCMapType == AI_LWO_RGB)
                                 pvVC[w]->a = 1.f;
 
                             pvVC[w]++;

code/PostProcessing/RemoveRedundantMaterials.cpp

@@ -50,6 +50,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/ParsingUtils.h>
 #include "ProcessHelper.h"
 #include "Material/MaterialSystem.h"
+#include <assimp/Exceptional.h>
 #include <stdio.h>
 
 using namespace Assimp;
@@ -171,6 +172,8 @@ void RemoveRedundantMatsProcess::Execute( aiScene* pScene)
         }
         // If the new material count differs from the original,
         // we need to rebuild the material list and remap mesh material indexes.
+        if(iNewNum < 1)
+          throw DeadlyImportError("No materials remaining");
         if (iNewNum != pScene->mNumMaterials) {
             ai_assert(iNewNum > 0);
             aiMaterial** ppcMaterials = new aiMaterial*[iNewNum];