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UnsupportedOperationException in FbxNode.setWorldBindPose() #1933

@stephengold

Description

@stephengold

I'm testing current "master" branch with FBX assets downloaded from CGtrader, Mixamo, and Sketchfab.
Attempting to import a certain FBX file causes the following crash:

Jan 28, 2023 11:58:05 PM com.jme3.app.LegacyApplication handleError
SEVERE: Uncaught exception thrown in Thread[jME3 Main,5,main]
java.lang.UnsupportedOperationException: Bind poses don't match
	at com.jme3.scene.plugins.fbx.node.FbxNode.setWorldBindPose(FbxNode.java:163)
	at com.jme3.scene.plugins.fbx.FbxLoader.applyBindPoses(FbxLoader.java:282)
	at com.jme3.scene.plugins.fbx.FbxLoader.load(FbxLoader.java:113)
	at com.jme3.asset.DesktopAssetManager.loadLocatedAsset(DesktopAssetManager.java:272)
	at com.jme3.asset.DesktopAssetManager.loadAsset(DesktopAssetManager.java:388)
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:439)
	at com.jme3.asset.DesktopAssetManager.loadModel(DesktopAssetManager.java:444)
	at jme3test.helloworld.HelloJME3.loadModel(HelloJME3.java:88)
	at jme3test.helloworld.HelloJME3.simpleInitApp(HelloJME3.java:67)
	at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:240)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:139)
	at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:221)
	at java.base/java.lang.Thread.run(Thread.java:833)

The failing code tests for exact equality between two bind-pose matrices:

public void setWorldBindPose(Matrix4f worldBindPose) {
if (cachedWorldBindPose != null) {
if (!cachedWorldBindPose.equals(worldBindPose)) {
throw new UnsupportedOperationException("Bind poses don't match");
}
}

For the file I'm studying, the actual differences between the matrices are less than 10^-19, so I assume they're caused by roundoff error somewhere upstream. There ought to be some tolerance in the comparison.

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