Light effects in Carrara are independent of the lights themselves, are applied post-render and won't work if your light is 'hidden' behind another object. This applies whether the object is transparent or not.

The solution is to create two lights, one to light your scene from behind your glass object or whatever, the other (placed forward of any obscuring objects) to provide the lens flare or other effect. This light must be 'Visible' but can have its Brightness set to zero so that it shines no light on the scene.

This method is simple enough for a single image but obviously has to be carefully controlled for an animation.

HTH

Message edited on: 01/28/2006 05:58