[pull] master from jMonkeyEngine:master #110
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This PR attempts to fix a rendering bug that a few jme have experienced on certain devices, as discussed in this thread: https://hub.jmonkeyengine.org/t/requesting-help-troubleshooting-pbrterrain-bug/47895 I believe the issue was due to a combination of things that were wrong with the process of reading normal maps, calculating tangents, and then blending them. The order of these operations is important, and I believe it is also important to normalize the normal value prior to blending each layer, which I previously was not doing. There's also some code that puts a normal map in the proper range, and this was being done improperly for tri-planar normal mapping. Once this PR is done I'll post back to that thread and request testing from the users who were experiencing the bug on their device.
…been coupled in the tangent calculation
Fix Rendering Issue in PBRTerrain
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