I've just started out with JME, so it might well be that this is not a problem of JME, but of my code…
I've noticed unusual behaviour of the bounding volumes in the SkyboxTest application. I've modified the code a bit; I've removed the torus and the cube and made the sphere smaller. The latter is exactly what's causing the problem.
When I start up the example, everything is rendering fine. But if I "fly" straight through the sphere, the skybox suddenly disappears. After this, the clipping of the skybox is linked with that of the sphere, which seems like the common problem of "forgetting" to set a bounding volume on an object. Now, as the skybox is a node and not a geometry, I can't set a bounding volume here.
Also, when displaying the bounding volumes (using the B-Key), one can see a change of the (presumably) root node's bounding volume when flying through the sphere.
I'm not sure if this is a bug, but how am I supposed to handle that? Why does
have no effect on the clipping of the skybox?
Another effect I've noticed is that, when you remove
the sphere isn't rendered when it's not very near to the camera. Seems like the skybox does write something into Z-Buffer?
Anyhow, thanks for your time and keep up the good work!
Here's the source of the modifies SkyboxTest.java:
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