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Weird Heightmapping issue

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[size=1]Hello! My team is currently running into an issue while attempting to create a lod imposter system generator. Basically you put in a model and it spits out the heightmaps/normal maps/ and texture maps, from all angles, to be used as an imposter in-game.

The problem is though, the front and back, or left and right, or so-on view, do not match up, so when the imposter is drawn its all messed up.
There is a way to fix this though, say your looking at the front view. Get the back view, drop the brightness all the way, and put it behind the front view and mirror it, then align it to the front view. This fixes the issue on the imposter, but thats not intuitive.

The heightmaps we are trying to make are for asteroids, but we just can not get opposing views to match up. It doesnt make sense...
Any ideas on how to solve this?

I can post pics if it helps you understand the problem.

All solved.

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