Hi,
Just doing some R+D for a job and the test render has very jumpy reflection/refractions in it. Could anyone tell me why? Perhaps it’s just a matter of more refinements?
Note - Use Scene Refinement/AA settings is switched on.
Edit: As a bonus if you download the materials you get a nice diamond 3D mesh and a really nice HDRI wahoo
The issue here is the Temporal AA - that node works by essentially jittering the camera per frame and averaging the values. To make sure the scene isn’t a jittery mess, motion vectors are used to calculate where to jitter more and less, but with RT Glass, the refracted edges won’t come up in the motion vectors, so you can get jitter. In this case, I would either use FSAA (if your rendering the scene anyway), or use FXAA to smooth out the edges.
Also, that diamond mesh is very nice 
UVs and bevels!
– Ryan
Thanks for that Ryan!