Attached Link: http://ockhamsbungalow.com/MiscProps/TranslucentLampshade.zip

The Translucence parameter in P6 works well, but there's

a trick.  You have to have the FRONT of the object facing

the light, and the BACK of the object facing the camera.

(Front and Back in terms of normals.)

Here's a sample of a translucent lampshade: the inner

layer is the translucent part, and its normals face

the light bulb.  The outer layer is semi-transparent,

and its normals face the camera. 

 

You could do a shower door similarly.  Take two one-sided

squares; face them oppositely; set the layer inside the

shower to translucent, and the outer one 80% transparent.

Add a Spots or Clouds node to the transparency on the

outer one.

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