render issues large scene Tweet

[djiin]

hi everybody,
i'm trying to get an animation rendering and face several problems i don't know where to start to resolve it.
i got a scene with low poly (quite a lot) in maya which i have to set as reshapable proxy to smooth + imported cad mechanical parts.
each separate elements render fine but when try to render with all parts together the render doesn't start anymore.
i've tried with a gtx 770 GPU and also with a titan pascal but no difference.
is there a limit somewhere with octane? what should i look at first? GPU? RAM?
thanks

s.

[djiin]

i've just tried to export the scene to standalone but same problem, the info tells me it fails (6633318 tri, 887 meshes)

[calus]

Disable the opensubdiv feature on all object where you can use "the rounded edges" feature instead. Rounded edges works very very nicely in Octane now and are great for CAD object.
Also close all other application in your system that could use VRAM.

But you don't have so much geometry only 6 million triangles so I'm not even sure that VRAM is the problem,
do you have many big textures ? in this case you could use the out-of-core feature for using RAM instead of VRAM for your textures.

[djiin]

ok thank you, i'm gonna try right away and i get back

[djiin]

no, rounded edges doesn't smoot my low poly in the render...

[calus]

Rounded edges only smooth normals of hard edges, so usualy it's a good feature to use with mechanical objects and reduce the need of smoothing.

But as I said before you don't have so much polygons anyway, so might not be the problem,
do you have lot or big textures ? did you try the out-of-core option in render settings ?

[djiin]

yeaaah;) look like it is working! (for the moment) THANK U!

[djiin]

does it slows down the render? what setting should i use for out of core?

[itsallgoode9]

If you try and render the parts as a whole as your first render when you open Maya (open maya, render your whole object literally before you try rendering anything else) does it render? Then if you stop the the render, you can't start it again until you restart maya?

That's the situation I'm in...I literally have to restart Maya every time I need to restart a render after having stopped it. I'm running 1080's and the vram usage is somewhere in the 6-7gb range, so i've got plenty of headroom. I have been slammed with deadlines at a new job so I haven't been able to export to standalone to see if results are the same there, so I haven't badgered devs on this problem till I have time to test it.

I'm wondering if the initial render isn't flushed out of vram when it's stopped (only flushing when Maya is closed down), so it's effectively trying to hold multiple instances of my scene in vram every time I render, well surpassing the 8gb's on my cards after the first render. If i'm rendering smaller portions, like you, I can stop and restart renders fine but I'm wondering if that's only because I haven't done that enough to reach the vram capacity of my card. I could be way off though (as I mentioned, I haven't had time to test different situations yet) but it sure is acting like vram runs out after the first render.

on the note of Obensubdiv- is it lower memory usage to actually smooth the polys in maya vs using octane open subdivs?

[calus]

does it slows down the render? what setting should i use for out of core?

There is around 15% slow down only with out of core option,
if it works for you with default setting let it like this, but if you want to understand how RAM and VRAM are dispatched,
better to look in Standalone,in preference in the the out-of-core tab , there's a nice dynamic graphic showing everything.