I build a model in sketchup. Then i export it as .dae file, import it in blender and use remove doubles and limited dissolve. After that i texturize the model.
In this step, I often find minor errors on the model which i can't repair in blender.
This means back to sketchup, fix the problem, export as .dae an so on.

Therefore i had the idea to apply the texture directly in sketchup where i directly can fix these minor errors and afterwards export it to blender. But in this case i had the problem that the texture in blender dissappears when i join objects to do remove doubles and limited resolve just once. Without that step ich have to do remove doubles and limited resolve more than a hundred times

This is why i'm looking for other ways to export the textured modell to blender.

The Collade exporter works fine if the model has no texture.
I'm looking for a way to export objexts with texture and import it to blender.

When i use the .dae fomat the texture behaviour is very strang for example: textures dissapear when i join objects.

I was very happy when i found die OBJexporter because it exports the modell and texture very well. Unfortunally these distorsions make it unuseable.

Maybe i have to test the .stl exporter too.

This means no chance to solve to problem?
Using the .dae export the geometry is also triangulated but there is no face distorsion.

Here are the test-files.

Test-0.zip

The issue can be easily reproduced.

Build a face. Place two other faces on it an put another material onto these two faces.

Save and export as .obj-file.

Import in Blender.
After remove doubles and limited dissolve you can see normals not standing in 90° on the face, which are causing these shading errors, i guess.

[

](http://picup.oliverlamm.de/files/IMG_9415199a237946b96b06371ef659aea7_36mzFlCf85_Ok.jpg)

If needed, i can upload the used files.

best regards
Christian

I have the problem that the OBJexporter sometime produces shading error like this:

Any suggestions how i can prevent this?