template<typename IndexType>
    void addIndexDataImpl(IndexType* iPos, const IndexType* iEnd,
                                                    VertexLookupList& lookup,
                                                    unsigned short submeshID)
    {

        // Loop through all triangles and connect them to the vertices.
        for (; iPos < iEnd; iPos += 3) {
            // It should never reallocate or every pointer will be invalid.
            OgreAssert(mTriangleList.capacity() > mTriangleList.size(), "");
            mTriangleList.push_back(PMTriangle());
            PMTriangle* tri = &mTriangleList.back();
            tri->isRemoved = false;
            tri->submeshID = submeshID;
            for (int i = 0; i < 3; i++) {
                // Invalid index: Index is bigger then vertex buffer size.
                OgreAssert(iPos[i] < lookup.size(), "");
                tri->vertexID[i] = iPos[i];
                tri->vertex[i] = lookup[iPos[i]];
            }
            if (tri->isMalformed()) {
#if OGRE_DEBUG_MODE
                stringstream str;
                str << "In " << mMeshName << " malformed triangle found with ID: " << getTriangleID(tri) << ". " <<
                std::endl;
                printTriangle(tri, str);
                str << "It will be excluded from LOD level calculations.";
                LogManager::getSingleton().stream() << str.str();
#endif
                tri->isRemoved = true;
                mIndexBufferInfoList[tri->submeshID].indexCount -= 3;
                continue;
            }
            tri->computeNormal();
            addTriangleToEdges(tri);
        }
    }