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jme3-plugins imports NormalTangentTest incorrectly #2098

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stephengold opened this issue Oct 13, 2023 · 0 comments · May be fixed by #2120
Open

jme3-plugins imports NormalTangentTest incorrectly #2098

stephengold opened this issue Oct 13, 2023 · 0 comments · May be fixed by #2120
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defect Something that is supposed to work, but doesn't. Less severe than a "bug"

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@stephengold
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I noticed a defect in GltfLoader while developing the MonkeyWrench library.

The test data is NormalTangentTest from Khronos's glTF sample models.

Here's how it looks in CompareLoaders when "NormalTangentTest/glTF/NormalTangentTest.gltf" is loaded using jme3-plugins:

Normal-Tangent-Test

According to the documentation for the sample model, this result indicates that the sign of the Y component of the normal is reversed.

I haven't identified the root cause of this bug. However, since MonkeyWrench passes this same test, it's likely the bug is in jme3-plugins, not the PBR material.
@stephengold stephengold added the defect Something that is supposed to work, but doesn't. Less severe than a "bug" label Oct 13, 2023
This was referenced Oct 17, 2023
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defect Something that is supposed to work, but doesn't. Less severe than a "bug"
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Fix for Inverted Y Component on Gltf Normal Map Loading codex128/jmonkeyengine
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