Ilya,
Maybe this solves your problem:
- Draw the desired shape with walls
- Make the walls very thin and very low
- Apply a transparent texture on both sides of the walls (see attached file)
- You can export/import the shape, then use it like any other model.
NOTE
It will show up in the 2D preview.
It will also show up in the 3D preview.
It will show up in low quality render. (setting 1 or 2)
It will NOT show up in high quality render. (setting 3 or 4)
Hans
file: transparent.gif
screenshot: http://www.mediafire.com/view/196vd6sgn1nhfwn/invisible_objects.png
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Hans
new website - under constuction
hansdirkse.info
