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Occasionally the part and the image will map with an inversed normal. This means the section of the image appears backward on the facet. To remedy this this You need to reverse the layout of the 2D part. Select the 2D part and apply a -1 scale part then use the middle blue node on the edge and drag in past the opposite edge. You can now reposition the newly edges, as long as you do not recross their positions. The edge you select depends upon how the reversal appears, in other words is it reversed along the X or Y axis. You cannot simply scale -1 along the X or Y axis depending upon how the reversal appears. If the Scale options are not in the Edit Bar use the UV Mapping Options to tun them onvia the Edit bar. This will only flip the part but the reversed association will remain. Do not flip the 2D part via rotation. This will only flip as the reveres part but the reversed association will remain.
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