made MaterialDescriptors more general, so they are useful for linear structures as well as buildings
made MaterialDescriptors more general, so they are useful for linear structures as well as buildings

seanisom/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,markraz/vtp,markraz/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp,seanisom/vtp