Renderers need special instructions to create the fancy light patterns you see behind the and around the bottles. This image contains 2 kinds of caustics. First are the Reflected Caustics, those are the ones you see in front of the bottles. They are bounced off the object. The second type are Refracted Caustics. Those are the ones behind. They are created when light passes through a transparent object. the sharp edges int the pattern are possible because of the "sharp" edges in the model.
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