RPF and render times

[powerandrubber]

I was a few frames into rendering a huge animation with precalculated imap and I decided to restart changing the output to RPF files instead of TGAs so that I may someday add motion blur and atmosphere in post. I also enabled z-value and object velocity in the g-buffer settings. However my rendering time has more than doubled. Is that normal? Does it take extra time to calculate z-value and velocity?

[Dynedain]

I just ran into something very similar.

I was rendering to RPF already, had zdepth in there already (not sure about velocity). Went to rerender and flipped on all the gbuffers in the vray rollout and switched some of the gbuffers in the rpf save dialogue, and my rendertime has suddenly jumped from 20min/frame to hitting the 600min/frame timeout limit.

I am as mystified by this as you are.

[paulison]

possibly render out the RPF using standard renderer and then overlay the animation made with the TGA's from vray?

I dont know if this would work but I basically do the same thing with EPIX still frames to save out the depth info.

[gilicom]

i usualy render it into rla format with out any problems?
could rpf compere to rla be the problem?

what velocity used for and how?

[powerandrubber]

Thanks for the replies. I ended up going back to TGAs. The rendering with scanline and overlaying idea would probably work except I'm using proxies and displacement. I suppose I could do a vanilla scene in vray, no lighting, flat material etc. and get the velocity and z channels needed fairly quickly. I wanted the velocity channel to get motion blur in post since it takes soooo long to render. RLA files apparently don't support velocity, at least in Viz4.

[Dynedain]

Hmm... with my scene, a lot of fixes helped the rendertime. Fixing up some bad geometry helped most of all, but trimming off the Vray GBuffers that i wasn't using (Diffuse and everything after it) helped as well. They don't get dumped into RPF anyways. I also turned off several of the others that I wasn't using (atmosphere, material ID, node ID, background).