Strange looking frame buffer when rendering 5000px in width

[Jorgensen_cg]

When I render an image with 5000px in width, the frame buffer look odd.

Is there somekind of limit in width ?

When I render in 4500px width, it looks ok.

Thanks
Jorgensen




ps. it seems that it is not possible to attach images. I get an error that says that the uploadfolder is full.

[kwistenbiebel1]

Re: Strange looking frame buffer when rendering 5000px in width

Looks like a RAM issue.
I think you would need to render sizes like that straight to hard disk (the option to render VRImage in the 'options' panel)....or buy extra RAM.

Currently I have a similar problem, not on high res images, but on animation, where the incremental adding of the irradiance map, rockets the RAM usage quickly to a point it eats my 8GB RAM easily, resulting in a guaranteed crash every 50 frames or so. Drives me nuts !

[Jorgensen_cg]

Re: Strange looking frame buffer when rendering 5000px in width

Hi Biebel

Thanks for your reply. I'll try that.

[kwistenbiebel1]

Re: Strange looking frame buffer when rendering 5000px in width

I didn't use the VRImage myself yet, so I am not sure what to do with the ouput... but in theory it should do the trick.

As a note: I solved my own RAM issue on animation (see post above) by checking the 'auto save' option in the irradiance map tab.
In this way, the incremental adding is saved to hard disk and not so much accumulated in the RAM usage.
An even better way would be to run a incremental irradiance map cycle (Irrmap+none) and save the irrmap preliminary to doing the final rendering. But I found out that just letting Vray do the irradiance map on the fly during final rendering doesn't increase render time that much.
Light cache on the other hand is best done 'load from file' after a render cycle using LC+LC.

...just my observations.

[dalomar_cg]

Re: Strange looking frame buffer when rendering 5000px in width

Biebel,

Glad to hear you got you're crash issue worked out. Hate to bust your bubble, but your observations are actually proven animation workflow that people have been using for years. In fact, when running the prepass you only need to render about every 5th or 10th frame (every single one will take longer and not show any real difference). We have a tutorial for it (for Rhino, but the concepts are the same), and there are a number of tutorials for it around the internet...I just think your time is probably better spent doing other things as opposed to reinventing the wheel.


For using the VRImage files, you need the VRimage to EXR converter. After the rendering is done, run the vrimage through that and you'll have an EXR that you can open up in PS to do whatever you want with.

[kwistenbiebel1]

Re: Strange looking frame buffer when rendering 5000px in width

No bubble here.My findings were based on things I read on the Chaosgroup forum, spot3D and the Rhino tut.

Pre rendering the Irrmap only every 5 frames produces artifacts in my trials, so I prefer to do a complete Irrmap of every frame in the final rendering.
I could probably do it as you state, but that will take time tangling with the settings, and I prefer to spend that time out in the open while the PC is doing the job