Again, please take a look at my model inside TM, as you see the model appears transparent.I would like to know why it happens. The 3d sw is Rhinoceros 7, and the surfaces are created by nurbs (no...

Development Rendering
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Hello Massimo and thank you for reaching out.

Try going inside the boat and with the eye dropper, select that surface.

This should open the material menu under the TM viewer.

Once you see the material menu go to settings and enable double-sided.

This should fix the issue.

If it doesn't please us know

Thank you

MC