@nehon Thank you very much for this precise explanation. I never thought about double sided faces before… you made my day 
As you said I’ll have to rework the model in Sketchup. I’ll come back after that.
Now I am back to bring good news: The flickering problem has been solved by three rules:
- Textures have to be on the front face (some faces had to be reversed)
- The back faces should not be exported (by changing the configuration of the ogre export tool)
- When texture compression is active, the size of textures have to be a power of 2 (e.g. 512×512) @Blockhouse thanks for the info about texture size for android
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