Quote - The visible part of the cloud is behind the camera. I realize you can see the corner of the bounding box, but clouds don't render right to the edge. Drag the bounding box away from the camera so that you can see the entire box, then try a test render. Light through transparency doesn't affect clouds.

Um, I don't think so - as I said, I spent a long time getting the bounding box of the cloud into view - the three arrows: red, green and blue - that's the centre of the cloud.  So it's not behind the camera - is it?

Or am I going completely doolally?

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