Hallo, I ve  noticed that when I import some meshes into poser it will make some distortions on topology, mostly around areas modeled by bolean operations. I would correct them in modeling program but there are no distortion visible here, mesh looks clear here. Is there any way around this?

No way around it.  Poser hates long narrow slices.  

The only real cure is to redo the mesh so that its faces are closer to "equilateral". 

Thanks. What you mean by "equilateral"?

Closer to having equal dimensions on each side.

John

could this be a problem of ''crease angle 80 ''

;)

Quote - could this be a problem of ''crease angle 80 ''

;)

Nope. Poser refuses to render long, thin triangles correctly and that's that.
This has been a fundamental problem with Poser for years, as well as the fact that it won't even look at n-gons. Fixing these issues would be a great step in the right direction.

Attached Link: Miri's treehouse

     Here's a modeler screenshot of a wall after three arched window openings have been Boolean cut, and then the surface triangulated.  I have highlighted two examples of "slivers", one of which is so acutely angled that it appears to be only an edge, though it is actually a very thin triangle.  If UV mapped and then rendered in Poser, this wall would show blurry smears in the texture, near the "slivers". 

      After making a Boolean cut, manually re-build the wall surface with gently-angled quads.  Poser will render this wall perfectly.

      There seems to be an exception to the "No n-gon" rule.  The following is my personal observable and repeatable experience.  Poser is perfectly happy with strictly convex n-gons, as shown in this example.  If there is so much as one concave angle in your poly (such as an hourglass silhouette), it won't work.

      Similarly, non-planar polys can be useful, as they resist disappearing when viewed edge-on.  The warning for this trick is that as you twist the poly, don't go so far that any two edges pass through each other ("Don't cross the beams!  It would be...bad." as the Ghostbusters would say.

      The hotlink at the top of the post shows a Poser Pro 2010 render using quad-rebuilt surfaces, convex n-gons, and non-planar polys.

Purposely creating non-planar polygons is considered extremely poor modelling practice, not just on models destined for Poser. On a model of any complexity you will definitely end up with problems. Non-planar polys are often the reason that people end up with what looks like black holes in their renders. The same goes for n-gons in Poser. I can guarantee that at some point they will cause render errors. The best solution is just not to do it.

Boolean and Poser do work but it takes a bit of cleanup.

This might help the OP depending on the complexity of the model.... Open the model in UVMapperPro then under the Tools select vertices the select Split by Vertices, option group, or material all depends on what you are attempting to fix.
Note, you may have to remap.
Save the model under a new name, import into Poser and test.

This is what that operation resulted in... no seams showing in render.

Make sure you triangulate you models when using boolean operations, that solves a lot of texturing problems for me. After that as suggested, you may need to remap your textures.

Attached Link: http://www.sparkyworld.org/files/booleans.pdf

If you want to get booleans from Carrara into poser basic tutorial at link above.

Don't skip the triangulate stage in carrara and try it in uvmapper or it can fail.

It's not a perfect solution, you will still get the issue that seachnasaigh shows above, not sure how to fix that in carrara ( 

Question for UVmapper gurus. I see the latest version can show which polys are 'stressed' and it can show reversed normals (aka back faced polys).

Does anyone now if you can select just the bad ones and reverse these in one hit  in this version. Or is this a mannual 'select-every-one' job like in poser ?