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I want to render some glass, in order to actually see something it requires a background. However I want the glass object to have a transparent surrounding. How do I make a background which is considered by the refraction of the glass but is transparent when it is seen directly by the camera?

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  • $\begingroup$ I'm not sure if this is possible in BI, but it's pretty easy in cycles. $\endgroup$ – gandalf3 Aug 11 '14 at 17:48
  • $\begingroup$ Unfortunately I need a solution for BI $\endgroup$ – Machtl Aug 12 '14 at 6:06
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Using blender internal, for the material of the objects you want to disappear, turn on transparency and choose mask with an alpha of 0.0.

enter image description here

The transparent objects will still show in reflections but not be seen in the camera.

enter image description here

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    $\begingroup$ Note that if there are objects behind the mask object, they will be replaced with sky. $\endgroup$ – gandalf3 Aug 12 '14 at 6:24
  • $\begingroup$ Works like a charm $\endgroup$ – Machtl Aug 13 '14 at 5:42
  • $\begingroup$ I should add that for this to work in the Options category of the material Traceable must be checked. $\endgroup$ – Machtl Sep 10 '14 at 14:07

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