Can you split mesh per material?

alesmohoric

Hi!

I have a mesh/clothing that has 2 materials. It is a dark shirt and some gray stripes around it.
If I feed that to Decimator, he does not care about materials, he just cares about the whole mesh.
The result is horrifiying.

I would like to decimate the shirt (Material 1) and the stripes (Material 2) serperately.
Maybe I could do some groups? But even if so, I do not want to click every single polygon.

Is there a way:

a)  to select material 1 and decimate it?
b) select subset of a mesh, create a new mesh and then decimate it?
 

Thank you in advance!
Kind regards,
Ales