highest resolution with vray 1.5

[Janosik]

hello

i am asking this question because i need to do, higest resolution as i can ( bilboard with width 2,5 m ) so i need 150 pix per inch ( about 15000 pix per 2,5 m) and i don t know how to manage it .....

can you help me with this ?

[instinct]

Well first of all you have to save to vrimg or exr via the vray vfb not the max vfb.

Set your max vfb to 1x1 pixels resolution. Set the resolution via the VrayVFB tab. And be sure to turn off "Render to memory Framebuffer". Should do the trick.

Regards,
Thorsten

[chipnuts]

That shouldn't be too difficult to manage. I'm working on a 30000x12500 image right now.
Here's my work flow for it using IR/QMC for my bounces.
First, I set my resolution to a nice number divisible by the super high res render. So if you're rendering to 15000x15000 for instance, set your res to about 1/4th that size or 3750x3750. That's something your comp should be able to handle. If not do 1/5th.

Then I generate the IR map using High preset settings and set my my QMC samples relatively high as well to reduce splotches. If you have extra computers, I'd suggest using Distrubuted Rendering to help create the high res IR map. Make sure to save the IR map.

After the IR map is generated, change your IR settings to use the saved IR map (IR maps are world-specific, so you can generate an IR using lower resolution settings and apply that to a super high res render), then go back to the Common tab and set up the file name.

Then enable network rendering and make sure you have your manager and servers already on. Then use the split scanline method, and set a number of splits again nicely divisible by the end render size. You may need to turn off VFB to make sure you have enough RAM to render the strips. You can make them as thick as your computer can handle.
Finally, you may have the problem where the image needed to be stitched together won't have enough RAM to stitch, so you may have to reassemble by hand in photoshop or something similar. That's what I'm doing right now. Fun!

Hope that helps!

[andrewjohn81]

that will still also depend on your scene size. We've had scenes that wouldn't do that either. There is no set limit to resolution. That depends on your system and what is actually being rendered.

Also, bilboards 150ppi, really? Most billboards in the US are only about 50ppi at high quality. Some are only 9ppi depending on how big they are and how far away. If the board will be for the highway you might get your client to reconsider the quality.

[Janosik]

2 all :

thanks for your idea s, some of then is very interesting, so i choose from these the best one for me, i think 150 ppi is high as you sayed so i try lower setting maybe 72 ppi will be enough.

Scene contains about 50 proxy bushes so i hope my pc will be able do lightcache without any crash. ( 4 gb memory 2 soc. board 4 cpus )

btw from your experiences how is high number of lightcache for this huge resolution ? ( LC mode is : screen and first bounce is brute force at 12 sub. (qmc) )

[Da_elf]

ive seen posters done less that 72 before. the average viewing distance of a billboard is very far away. who will tell the different of 60dpi and 150dpi at a distance of 10 feet away or more

[chipnuts]

I could

.....J/K

[themaxxer]

2 all :
Scene contains about 50 proxy bushes so i hope my pc will be able do lightcache without any crash. ( 4 gb memory 2 soc. board 4 cpus )

is it an exterior? then you could use qmc as secondary bounce. I did exteriors with qmc, because lightcache crashes always. 3 bounces should be enough.

best regards
themaxxer

[andrewjohn81]

RE: Da_Elfs 10 ft comment.

It's not telling the difference when compared, chipnuts, it's just that you wouldn't notice low quality unless you had them right next to eachother and were looking for it. The majority of people wouldn't ever even think about it because they aren't looking for good/bad quality. They are looking at the content. Unless quality is noticeably good or bad then they probably will never even notice it.

A good trick, laminating. Regular people are more impressed by laminating than high dpi. Plus, on many papers laminating helps blend the colors together and make them appear more rich.

[chipnuts]

chipnuts, it's just that you wouldn't notice low quality unless you had them right next to eachother and were looking for it. The majority of people wouldn't ever even think about it because they aren't looking for good/bad quality. They are looking at the content. Unless quality is noticeably good or bad then they probably will never even notice it.

Right, I was 'just kidding' that I could tell the difference, hence the '.....J/K'

I bet your laminating tip is 100% accurate, b/c (because) most people would just go, 'OOooOOH! glossy... pretty!' hehehhe

[Janosik]

2 themaxxer : yes is exterior

heh for final render i hit only 6000 pix per width coz i got background image taken with some s....y camera at 3000 pix per width so background is a bottle neck . I choose vray sinc 9 pix filter too, so i hope it will be enough for this case.

2 all : thanks to all for your ideas and opinios

[EricCamper]

Yeah...I get this all the time....I had someone ask for a 9600 dpi image at 20 feet by 10 feet...LOL....

[Clifton Santiago]

I recently completed a 32,000 px exterior rendering for a 12m banner. Couldn't get the IR to save, nor strip rendering to work. Ended up using QMC/QMC, with blowup regions.