30K render??

[nick_martin]

Hey guys, we are trying to render out a massive 30k image for a client (they are using it for a trade show so will be seen from up close). I tried using this method from the vray docs - https://docs.chaosgroup.com/display/...y+Large+Images

It seemed to be working and rendered for about 35hrs and seemed to complete the render... but no image was saved. I had it set to save from the vray frame buffer as a VRIMG file. There was an error in the vray messages - Error: [RIFile::WTVRayInfo] No file stream

Does anyone know what this error might be?

Anyone got any other workflows for rendering huge images?

[squintnic]

if this is requested i would consider doing 10-15k and upscaling
are you textures and models going to have the res to support that level of detail at 30k anyway? I doubt it

[nick_martin]

I was using 8k textures so would be interesting to see how they look at 30k! How would you upscale? Just change size in photoshop? Or is there a plugin that can do this properly?

[nick_martin]

So I've worked out the best way of doing this. Its using the 'blowup' region render setting in max. So if you want a 30k x 20k image, this enables you to split the render into six 10k x 10k regions. You save them as vrimg files, use chaos groups vrimg to exr tool and then open them in photoshop and stitch together. Easy!

[vlado]

There was an error in the vray messages - Error: [RIFile::WTVRayInfo] No file stream

It may mean that V-Ray could not create the output image file as specified in the "V-Ray raw mage file" field.

Best regards,
Vlado

[hoch5]

I've had the challenge a few months ago with a 45k by 12k image. Max has a limitation at somewhat 32k pixels on one side, but disabling the memory framebuffer of v-ray while writing directly to a raw image file made it possible. It's been a quite heavy scene, but even the 32gb ram of my computer made it in the bucket mode. Actually i was quite impressed. Rendertime was about 72h hours. The only minor Problem was, that the GI got a bit splotchy in sharp corners (BF/LC).

So yeah, even without regions, it's possible. Maybe you could try with the resumable rendering option on, so the raw image file gets saved early in rendering.

[spyzor]

Had kind of the same issue but worked like hoch5.

One issue I had was to convert the vrimg to exr. With the tool included in Max 2018 (3.60.04) it crashed everytime. I had to use the one included with Max 2017 (3.60.03).
That was pretty stressfull

[nick_martin]

It may mean that V-Ray could not create the output image file as specified in the "V-Ray raw mage file" field.

Best regards,
Vlado

Any particular reason for this? Random bug? Or am I doing something wrong?

[werticus]

max supports 32k renders so you don't need to do anything special with vray image files.

I would use 'split scan lines' option in backburner so you can split it over the farm there. You will want to do brute force / LC or a lot of overlap on the scan lines to avoid any mis matches. Certainly don't use IR map, tho i know you love it

[nick_martin]

max supports 32k renders so you don't need to do anything special with vray image files.

I would use 'split scan lines' option in backburner so you can split it over the farm there. You will want to do brute force / LC or a lot of overlap on the scan lines to avoid any mis matches. Certainly don't use IR map, tho i know you love it

Dude! We've moved on from IR.... haven't used it in about a year. We're 90% RT (cuda) here now. BF/LC all the way. GPU is the way forward IMO (only problem is you can't buy the bloody things because of all the miners).

Sounds like split scan lines is more or less the same as max blowup. We don't use backburner... way too dodgy. We're on deadline. Which interestingly also has a feature to split renders up.

[werticus]

Our scenes are too big for GPU ... Eventually when the GPU's that can share their ram with nvlink are cheap enough, probably go that route.

Try the split renders and see if it works, no idea how that would behave with GPU.

[nick_martin]

Split renders (max blowup) work fine with gpu. Really easy to setup. Have to do another one of a tigers face for the zoo (for the side of a bus) at 50k soon! Gunna use max blowup again.