changes based on pr comments

Conflicts:
	MeshLib/MeshGenerators/LayeredVolume.cpp

MeshLib/MeshGenerators/LayeredVolume.cpp

@@ -57,8 +57,8 @@ bool LayeredVolume::createRasterLayers(const MeshLib::Mesh &mesh, const std::vec
 
 	// map each layer and attach to subsurface mesh
 	const std::size_t nRasters (rasters.size());
-	for (int i=nRasters-2; i>=0; --i)
-		this->addLayerToMesh(*top, nRasters-i-1, *rasters[i]);
+	for (std::size_t i=1; i<nRasters; ++i)
+		this->addLayerToMesh(*top, i, *rasters[i]);
 
 	// close boundaries between layers
 	this->addLayerBoundaries(*top, nRasters);

MeshLib/MeshGenerators/MeshLayerMapper.cpp

@@ -109,7 +109,7 @@ MeshLib::Mesh* MeshLayerMapper::createStaticLayers(MeshLib::Mesh const& mesh, st
 bool MeshLayerMapper::createRasterLayers(MeshLib::Mesh const& mesh, std::vector<GeoLib::Raster const*> const& rasters, double noDataReplacementValue)
 {
 	const std::size_t nLayers(rasters.size());
-	if (nLayers < 1 || mesh.getDimension() != 2)
+	if (nLayers < 2 || mesh.getDimension() != 2)
 	{
 		ERR("MeshLayerMapper::createRasterLayers(): A 2D mesh and at least two rasters required as input.");
 		return nullptr;