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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, 2014 at 17:48
  • $\begingroup$ Unfortunately I need a solution for BI $\endgroup$
    – VoidStar
    Aug 12, 2014 at 6:06

1 Answer 1

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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, 2014 at 6:24
  • $\begingroup$ Works like a charm $\endgroup$
    – VoidStar
    Aug 13, 2014 at 5:42
  • $\begingroup$ I should add that for this to work in the Options category of the material Traceable must be checked. $\endgroup$
    – VoidStar
    Sep 10, 2014 at 14:07

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