Corrected normals for KRMeshSphere so the sphere will have a smooth surface.

Disabled KRMesh::optimizeIndexes as it is crashing with certain meshes, such as those generated by KRMeshSphere

kraken/KRMesh.cpp

@@ -1581,6 +1581,9 @@ int KRMesh::getTriangleVertexIndex(int submesh, int index) const
 
 void KRMesh::optimizeIndexes()
 {
+    // TODO - Re-enable this once crash with KRMeshSphere vertices is corrected
+    return;
+
     m_pData->lock();
     // TODO - Implement optimization for indexed strips
     if(getModelFormat() == ModelFormat::KRENGINE_MODEL_FORMAT_INDEXED_TRIANGLES) {

kraken/KRMeshSphere.cpp

@@ -113,6 +113,12 @@ KRMeshSphere::KRMeshSphere(KRContext &context) : KRMesh(context, "__sphere")
     
 
     mi.format = ModelFormat::KRENGINE_MODEL_FORMAT_TRIANGLES;
+    
+    // Generate normals pointing away from center of sphere.
+    for (int vertex_index = 0; vertex_index < mi.vertices.size(); vertex_index++) {
+      mi.normals.push_back(Vector3::Normalize(mi.vertices[vertex_index] - Vector3::Zero()));
+    }
+
     LoadData(mi, true, true);
 }