Vray's Limitation is SU (not a new statement)

holmes1977

I have been using Vray for about a year now to present my designs to my clients.

The more I use it the more I love it. But also realize its limitations due to SU.

My client wants to print a 1.2m x 2m advertising sign. Which means I would have to have a render output of 3600 x 6000 pixels or more. (please correct me if Im way off). I am having major problems with SU crashing at anything above 2048 x 1536. This is also using the render to VrImage method.

I realize that SU crashes because of its Ram use limits. So I cant quite understand how people use Vray to render any SU file above 25mb at large res.

As soon as I press render I painfully watch the Ram usage go up to 3ish gb then crash. Is there something Im missing, or doing wrong?

How do other people work around this problem?

Im using:

-The latest Vray
-SU 7 pro
-Win 7 prof 64bit
-i7 CPU 920 @ 2.67Ghz
-6gb Dominator Ram

Thanks for any help

thomthom

Even when using VRImage?

hmm... I've been able to render much larger than that.

Are you by any chance often using displacement?

What are your V-Ray setup (settings)?
What are you model stats?

Can you post a few examples of your scenes that run out of memory when rendered very large?

thomthom

Also, remember that when increasing the output you often can decrease other settings.

For instance, if you got your scene looking good at 800x600 with IR -4, -1, then when you increase output to 1600x1200 you can adjust your IR to -5, -2 since the IR is resolution dependant.

thomthom

@holmes1977 said:

Model Stats
Edges 2864
Faces 923
Components 136
Groups 186
Materials 87

That can't be the full stats... in the Model Info -> Statistic window, make sure you tick "Show nested components"

By the way, which version of VfSU do you use?

holmes1977

Also there is no displacement. Im only using bump on the stacked brick.

holmes1977

Hi Thom

Model Stats
Edges 2864
Faces 923
Components 136
Groups 186
Materials 87

Files size is 22.5mb
The largest material is the concrete driveway at 2550x3500 pixels at 2.89mb. Which is abit big but it is a large area.

Here is the image at 1024x768

The IR setting for this are -4, -1. When I rendered at 3000x2250 and left the IR settings the same. So tonight I'll changeit to -6, -3.

Thnaks again Thom your a star. I'll render this tonight and let you know how I get on.

holmes1977

Whoops having a dumb moment

Model Stats
Edges 818932
Faces 226155
Components 500
Groups 2151
Materials 87

That looks abit more like it. Tonight or this afternoon Ill render it again and see if chnging the IR settings helps. Otherwise I'll post all my settings.

Im using the latest Vray.
The last render I did had the RAM usage up at 3.24 gb, I was holding my breath waiting for it to crash but it didnt.

Cheers mate

thomthom

You have mentioned "The latest Vray" as your VfSU version, can you be specific? There's been several times where people have thought to have the latest, while they actually did not. And I also don't know if that means the beta or not.

thomthom

Ah yea - the version number is now located under Preferences -> Extensions -> V-Ray for Sketchup

There is an memory leak in this version however. So as you render after render you might find that memory is not released. Version .83 should be released right about now - but I'm not sure if it fixes the memory leak. But it does fix an array of other problems.

holmes1977

Sorry Thom for being vague
The Vray version is 1.48.66

It dosnt say what version Vray is in the options anymore
So had to hunt for the installer.

Ive finished work and am about to test changing the IR settings.

holmes1977

You were total right about the IR settings

Im now rendering double the size of the last render at 4096x3072
and it is using a whole 1gb less memory.

I didnt realize that it would make that much difference.

Have you had any experience in printing large images. If you have, what
output size do you think I would need if I wanted to print to 1.2m x 2m?

Thanks again for your help Thom

rv1974

It's sad but VRAYforSU is the oxymoron. Use original max version.

thomthom

It really depends on from where it will be seen. Such large images usually are seen from further away so one usually doesn't need the same resolution as A3/A4.

1.2m = ~47.24"
2.0m = ~78,74"

Say you print this in 100dpi - slightly larger than screen resolution:
47.24 * 100 = 4724
78,74 * 100 = 7874

But that might be very high resolution is you are at a distance.

1.2m x 2.0m has an aspect ratio of ~1,667
4096 x 3072 has an aspect ratio of ~1,333 - so that means some cropping must be done unless you change that.
Also, 1.2m x 2.0m is portrait, and 4096 x 3072 is landscape - so I'm not sure what orientation you are going for. ?

I'll assume the output to be 2.0m x 1.2m - landscape.

So if we use the full length of your render and print that to 2.0m, the resulting DPI is:
4096 / 78.74 = ~52.02dpi

thomthom

@rv1974 said:

It's sad but VRAYforSU is the oxymoron. Use original max version.

Getting a Max license - not a cheap solution...

And as for the semantics: can't say I see how one can define "V-Ray for Sketchup" as an oxymoron.

rv1974

@thomthom said:

@rv1974 said:

It's sad but VRAYforSU is the oxymoron. Use original max version.

Getting a Max license - not a cheap solution...

And as for the semantics: can't say I see how one can define "V-Ray for Sketchup" as an oxymoron.

There are some good examples of oxymoron in english wiki that depict my statement qiute well: Serious Joke, Sweet sorrow, Happy depression...

thomthom

"Metaphoric oxymoron" ?