Help! Insanely high render time with mental ray!

#1

Hi people,
I’m trying to render a 450 frame animation and despite i’m only rendering at HD780 without any particular setting, the render time is ludicrous. I left the computer to render overtime, I have the never sleep application to prevent pc from interrupting the render and after SEVEN HOURS it only rendered TWO FRAMES… i don’t know what to do, i even baked the dynamic and particle simulation :cry:
https://www.dropbox.com/s/flppgfefml2wtv4/spaceship.ma?dl=0 here’s the scene

#2

ill test it out here see what could be the deal, do a optimize scene see what it clears out

#3

Thank you very much :slight_smile: I’ll try the optimize scene

#4

also what is the spec of your comp

#5

Intel® Core™2 Duo CPU E7500 @ 2.93GHz, 2926 Mhz, 2 core, 2 logic processors
4GB RAM , graphic card AMD radeon HD 5500 series
the funny thing is that with this same system i rendered 12 frames of the same scene in a couple of hours… then i put aside that scene and resumed that work recently and now i’m having this slow down

#6

Could it be that mental ray behaves strangely because if the "mental ray is not registered yet " error that appears every time i open up maya? this error doesn’t pop up during render, infact the frames that i rendered are ok, but happens as soon as i start maya and makes my render settings window disappear… i have to run a script to bring back the render window but the next time i opne maya the error is still there. Could this be the reason?

#7

Hey dude, is that Radix?! Please tell me there’s a new Radix coming out…

Also, I tried looking into your problem.
It took 17 seconds to render a frame on my i7-3770k, but it came out black.
In-fact, after that, even a new cube in a blank scene renders black in Mental Ray.
I’m actually going to have to reinstall haha. That said, your background came up as grey when the background layer was turned off, obstructed by the NURBS plane which came out black. I’m not even getting anything in alpha channels any more though, your scene broke my Maya :surprised

#8

i would like to know what the bloody hell is going on…
the frames that i rendered, despite they took ages to render, are perfectly fine… what is this sorcery? :banghead: :banghead:

#9

also the render time is still too long, even if my computer is charcoal-powered, am i wrong?

#10

I got this in 2 min 30 (in Maya 2015 with a quad core and an Nvidia GT640, really nothing crazy here) :

[img]http://img11.hostingpics.net/pics/6149641301.jpg[/img]

Of course there's no texture since you didn't provide the image files.

Have you tried :
- resetting mental ray's default parameters (Presets > load presets > default settings)
- deleting your "prefs" folder : documents/maya/20xx(your version) (assuming you're on windows)
- deleting your "presets" folder (same directory)
- importing your file from a new scene instead of opening it
- re-installing mental ray : find mental ray for maya in "Programs and features", uninstall it and download the mental ray plugin for your version on Autodesk's website.

After that I would either re-install Maya or dig in the project to find what's going on, or if you have earlier versions of your project, maybe it's best to restart from there.

If you still struggle I can render some frames for you but I would need the textures.

#11

i did everything but importing that scene in another scene, i hink i’m going to try that

#12

Well if you’re still having trouble, the process of elimination is ofcourse the way to go. Standard debugging protocol:
Delete everything.
Does it work?
If not, see what gamnamno said.
If so, undo, delete half of everything…
Does it work? If so, undo and delete half of what you deleted before.
If not, undo and delete the other half.
Test again.
Does it work? If so, undo and delete only half of what you just deleted yet again… narrow down the cause. If it doesn’t happen to a blank scene, there will be a point at which something being in your scene causes it.
Hell it could be a group node gone rogue, causing inexplicable issues… it happens.
it only gets more difficult to find when there’s more than one thing… but it’s doable with that process. And if it seems to be MANY things, see if perhaps they share a common shader. Could always just be a noise texture with too many levels.