Attached Link: http://www.renderosity.com/messages.ez?ForumID=12356&Form.ShowMessage=2197864

Cath, you should know by now that I always do my homework "good"! Your lightprobe layout is different to the others that have been posted on this forum - check Nerd3d's image at the above link - your green "scene centre" represents the "bottom" of the scene in Nerd's graphic. Regardless of this, you are using the FRONT of the IBL image as the BACKground. Which means you need to rotate the IBL image 180 degrees in the Y Axis, and flip the background image. Otherwise your IBL lighting is 180 degrees out from the background image. For example, if you have an IBL with a very bright FRONT (say, the sun), and dark LEFT, RIGHT and REAR, when you cut out your background, you are getting the bright FRONT (which will mean the sun will be appearing in the background), but when you render with the IBL image, the front of your scene will be brightly lit from the IBL image (the sun), but the back of your scene will be showing the sun! So it will opposite to matching. That's why I put together the python script - to fix all this up and get it all matching. So your tutorial works for very evenly lit IBL images, but not for images that have variation in them.

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