The "hole" bug Hans mentioned at the beginning of this thread will be fixed in the coming version 2.5, with this bug and that one related to rendering too.
You can test the correction in the version 2.5 Beta 7.
db4tech, managing reflection can be done in the plug-in itself and I'll try that after the release of version 2.5.
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Emmanuel Puybaret, Sweet Home 3D creator
