It could be useful to have them for some of the PBR related tests like these ones:
TestPBRLighting.java
TestPBRSimple.java
PBRTerrainTest.java
PBRTerrainAdvancedTest.java
Although these screenshot tests may continuously need updated anytime any changes or bug fixes are made to the pbr shaders that intentionally cause even a slightly different render output. Hopefully this shouldn’t be a common occurrence, but it will likely happen at some point.
I’d also like to consider adding some new pbr assets and examples in 3.9 to better display jme’s current graphical potential, since right now there’s very few pbr assets in the test data library, I’m fairly sure that the only PBR assets are the tank and terrain in the examples I linked. I think it would be good to have a slightly more complex example/demo displaying a small polished PBR scene with post processing for a full demo of jme’s current capabilities. I’ll probably make another thread to discuss this more soon.