Does jme3 have any built in support for creating a truely reflective planar surface like a mirror? One that actually reflects the rendered scene, not just an environment map?
I’ve done it in DirectX, by changing the camera position and rerendering the scene to a texture then using a mask.
EDIT - I’ve found ReflectionProcessor, although its part of the water system, might see if that is a starting point
Yes look at the SimpleWaterProcessor that’s exactly what it does.