I find that unwrap is diffcult after apply modify of subsurface and solidy

.Because model has many many faces. And model is not a simple and thin

piece,coonnstruct of model has been changed. And I try to use "smart unwrap" ,which model has outer and inner part,which

is very complex. So I want to know: 1: To do uv unwrap before apply modify of subsurface and solidy or after

apply modify of subsurface and solidy ? 2: Any easy way that can make unwrap is easy after apply modify of subsurface

and solidy ? Thanks.

OK with a model that has thickness when you apply the solidify and subsurface modifiers smart UV is not going to give you the best unwrapping results you will need to cut up your model using seams to get you a much better layout of your UVs

Thanks. But that is very tough to uv unwrap. Beause model has many many face when you apply the solidify and subsurface modifiers . Any easy way ?

I'm not sure about the solidify modifier, as I haven't used it very often, but I long ago realized UV unwrapping was faster, and easier, if done BEFORE using subsurface division.

Needless to say, it depends on what the object is. This has always worked for me when modeling clothing. It's been a while since I've tried modeling a large prop or environment object with lots of detail, so not sure if doing the unwrapping before subdivision in that instance is better. I usually only use a Sub-D of "1" for clothing, and I usually do that in Poser, as I only use Blender for modeling, not final rendering.

Again, this is just how I usually work. Others may do things differently. I think you need to find the easiest/best way that works with your workflow.

My workflow is: applying the solidify modifier BEFORE unwrapping as it changes the mesh. If I used a mirror modifier I first set the seams (I usually do manual uv unwrapping), look if it's unwrapping is ok and then apply the modifier because this way I've already set the seams and do not need to do it for the mirrored side. For the subdivision: I always do the unwrapping BEFORE applying the modifier to be exact I almost never apply the subdivision modifier. This way it's eathier to change the mesh for further modeling. You can export your model as object and tick "apply modifiers" in the export obj options tab, you do not need to apply modifiers before exporting.

Sounds like a good workflow kratzdistel. I also like to set up seams before I unwrap.

I have used both methods of unwrapping before and after applying modifiers but have always usually marked my own seams first and done clean after making the initial unwrap I do not usually trust the smart UV option unless it is something very basic in shape and form. Is this model a piece of clothing atpo? If so I would mark seams along the sides like almost cutting it in half and to reduce face count if the faces wont be seen when it is worn if it is clothing then I would try and delete those that will not be seen