Calculating Render Times

[glorybound]

Okay, braineaks

If I am getting an hour render time at one resolution, wouldn't my render time double if I were to double the resolution? I am talking in general.

[joconnell]

If you double the resolution you're doubling the image horizontally and also vertically so you could fit four of your old renders into the space of your new one, thus you could be up to 4 times the render time. There's no guarantees though, there could be lots of boring flat areas in your scene that vray will fly through, even at a large resolution, and it'll only be certain parts of your image that'll add on a major hit.

[instinct]

Sadly this is very hard to predict and dependent on a lot of different factors. Higher resolutions means more details visible and that can change sampling quite drastically in many ways. Also factoring in things like GI and alike doesn't make things more linear heh.

If it where only for the resolution than double the res would mean four times the render time (double resolution = 4x the pixels)

Regards,
Thorsten

Damnit. John beat me to it ... again

[glorybound]

well... I guess I knew doubling would, in theory, be 4X's. I am getting clean renders, and good render times, at 800 x 450. The problem is doubling to 1600 x 900 seems to exponentially increase the render times. I need 3200 x 1800 and that render time seems astronomical.

[joconnell]

Damnit. John beat me to it ... again

You've the disadvantage of a wee kiddy distracting you all the time

[instinct]

You've the disadvantage of a wee kiddy distracting you all the time

Hah..tis the wive as the lil one is sleeping

@Bobby: There may be a lot of different issues heading in. Is this with GI? With GI changing resolutions can lead to settings overshooting a LOT. If you are re-using an irrmap it might also have a too low res and cause some bruteforce magic to kick in.

Regards,
Thorsten

[joconnell]

Same shot as you were looking at before bobby?

[glorybound]

Yep! it took 15hrs to render a pretty simple scene. By removing the vraylightmtrl, I got it to render, but 15 hours!

Same shot as you were looking at before bobby?

[joconnell]

Yowza - is that one you uploaded?

[Pixelcon]

Bobby might I suggest taking a look at solidrocks? It's cheap and although it wont make you a better vray "technician", it could potentially save you quite a bit of time. I render with it at work and my final quality 5k renders never take more than an hour on 6 slaves.

[glorybound]

I have it . To get clean renders I have to crank it up to ultra so, it tends to be an over kill for me. I never see render times that low so, I am doing something wrong, or my computer is wonky.

QUOTE=Pixelcon;566666]Bobby might I suggest taking a look at solidrocks? It's cheap and although it wont make you a better vray "technician", it could potentially save you quite a bit of time. I render with it at work and my final quality 5k renders never take more than an hour on 6 slaves.[/QUOTE]

[glorybound]

that's the one.

It might just be one material, but I can't find it. A gray material override renders fast. I looked under the hood of every material, but I can't find anything that seems off.

Yowza - is that one you uploaded?

[joconnell]

I'm up to my nads in here at the minute but I'll try my best to have a look - all this stuff interests me at the minute so it's worth me having a go. Are there many individual materials in the scene?

[glorybound]

just a hand full of materials.

I'm up to my nads in here at the minute but I'll try my best to have a look - all this stuff interests me at the minute so it's worth me having a go. Are there many individual materials in the scene?