Here is my model in 3ds max as you see its without bugs
Here in unity.Why that happened?how to fix it?Any ideas?
Thank you in advance.
Is it a hole in the model (in unity)?
Try a reset Xform and STL check in max, then reimport.
aha but how to do that?
they both are “modifier” . Apply them to the object and “collapse all”.
PS: STL check is a kind of utility used to reveal errors in geometry (such as multiple edge or double face), check the “Check” checkbox ( :shock: ) and errors will be red-highlighted, that you will be able to see if you have messed-up with something on the mesh. That can be why you have unexpected things after exporting to fbx.
I assume your fish is skinned. My guess would be that there is something wrong with weights on given vertices. Can you check that? Can you send me your model so I can check if latest Unity deals with that nicely?