Black shadows on attached objects

[Anonymous]

Hello!

I want to combine some meshes together, into one mesh. But when i try to attach them together, some really weird black shadows appears. 
I tried to fix this with smoothing groups but it didn't change anything.

[Anonymous]

Check the normals of the element you attached. Sometimes the new part gets flipped.

[Anonymous]

There are some normals that i cant flip, they remain black.. 😞

Here is my file: https://www.dropbox.com/s/tl48pueqfoyjgu1/Normal.FBX?dl=0

[blakestone]

There were a lot of problems with this model - random faces being flipped, floating faces, weird smoothing groups etc...
These types of issues are generally caused by scripts as a modeller wont go out of their way to flip random faces on their model and detach faces etc.

Whatever script(s) you're using I highly recommend stopping as they are doing damage to your model. 

I have fixed the model and have attached the MAX file (requires 3dsMax 2012 or higher to open).

How I fixed it was enabling "Backface Cull" (Right-Click > Object Properties) which stops 3dsMax from rendering both sides of the objects faces. This allows you to quickly identify which faces are incorrect. Then you can select these faces and flip them in the Editable Mesh or Editable Poly rollout.

Hope this helps.

[Anonymous]

Awesome! Thank you for your time.

But if i enable the culling, i can't select the vrong faces, because i can't see them.

This is one of my friends model, i don't know what scripts were used on this model.

[blakestone · Accepted solution]

As long as you don't have ticked "Ignore Backfacing" then you can select faces if they're flipped as shown below.