mesh model face deformation

[trondheimtour]

I build a duplicate model for the physics model with dimensions same as that of the original model .
I upload the model to secondlife . Then I checked for Render Physics shape . That is showing a closed model . The faces I created for my model of the building is all deformed to another triangular shaped faces , and the opening is closed automatically. **Only uploaded images may be used in postings**://secondlife.i.lithium.com/i/smilies/16x16_smiley-sad.gif" border="0" alt=":smileysad:" title="Smiley Sad" />
How it happened ?

[Rolig Loon]

Continuation of http://community.secondlife.com/t5/Technical/apply-physics/qaq-p/2849926

You should ask further technical questions on this topic in the Mesh forum, as advised.  You are much more likely to get detailed advice there.  Also, as advised, please include screen shots to illustrate your physics shape in Blender and in the SL uploader or Render Metedata image whe you repost in the Mesh forum.