Vray render size too big

Rendering V-Ray
1

Hi there vray rhino users-
My client has requested a 6metre x 6metre render of a product for a display and the graphic printer has requested a minimum of 150 dpi. Since vray only outputs in 72dpi this means my render needs to be 12mX12m or 36600x36600 pixels- -Whenever I try to do either size the rhino maxes out the memory GPU and or CPU and freezes or crashes. Rhino 6 Vray 3.6.2

Does anyone have a solution ?

Geforce GTX 1070
AMD Ryzen 5 1600 six core
3.2 Ghz
16GB RAM

Any help would be great

jahn

2

150 dpi is what they need for text and linework, which would be done with vectors, and therefore is actually possible. A render is more like a photo, and no camera with a resolution of 1.3 BILLION PIXELS exists except maybe in a scientific experiment somewhere.

Basically tell them they’re wrong and give them a decent render as big as you can reasonably handle, and make sure the sampling is very high so you don’t get any aliasing, which is probably more important than the resolution per se.

These absurd requirements for gigantic renders for large format prints are a bit of a pet peeve of mine, if you can tell. The very first digital cameras used by professional photographers were only capable of like 640X480 resolution, and they made great photos that were put on magazine covers. Someone’s bloody pop-up exhibition banner does not actually require ten times more pixels than 16K video.

3

Hey Jim

Thanks for the input - Taken onboard - unfortunately I’m not in the habit of telling clients they are wrong even though the temptation is often there! Doing the biggest render I can then will resample in Photoshop.

Regards jahn

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For tasks like this I use a photo enlarge software like Photozoom, so you get a little bit more quality than simple upscale per Photoshop.

5

There is also a reasonably priced BlowUp plugin for Photoshop for better quality enlargements. We use it for similar tasks with good results.

6

Thanks Jarek and Micha.
I have had a look at these programs and they seem to be good at what they do- Definately better than trying to render a 6m square image at 300dpi!!!

Jahn

7

Jahn,

We do a lot of mural size print graphics in that size range or larger. Typically we compose them in Illustrator so that the fonts are in vector overlayed on top of a raster image (prepared in Photoshop). That way we have crisp text when needed on top of a softer background raster image.

As 6x6m is larger than the artboard of both of those programs you will need to scale them according to your output (final print size).

Typically any raster image we do that size is never larger than 100 ppi at final print size.

A couple points worth mentioning.

  1. The new Photoshop CC 2018 or newer is excellent at enlarging images now. I use it all the time to do just that with minimal smoothing (or other filters) required.

  2. I typically prefer to use TIF or RAW raster images as they do not have the “artifacts” that are created as part of the JPG algorithm. They become very noticeable if you need to enlarge your image substantially. I then convert them to Photoshop PSD files.

  3. Also the new Illustrator “image trace” function works very well. Depending on how your graphic is going to be viewed (example: as a highway billboard at 80mph etc from 120ft away) it can convert photo images to some very reasonable vector output for very large print projects (in your size range).

  4. I see that your system memory is 16meg. I have created large graphics with that amount of memory but you will want to make sure that your Photoshop “Scratch Disk” is set large enough to handle the very large file sizes you will be generating. Also do not save your files to “compressed” versions of their formats. Ive noticed that tends to demand a lot more available system memory needed and generated out of memory issues for me. Scratch disk is a very capable “virtual memory” system but still needs available system memory to do the swap.

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