RenderElement Crashes

[idtools]

Hello,
We encouter a constant problem while HR rendering 5000x3750.
It happens that when we check for more than one render elements, it crashes : 'Error creating bitmap'. It crashes also with the VRayFB.
We use VIZ2007and VRay1.5 / AMD 2.4 + 2GB RAM on each of 5 rendernodes.
Thanks for your help.
Arno

[vlado]

Basically, you are running out of RAM. One way to reduce the memory usage for the render elements is to write the image to a .vrimg file and then use the vrimg2exr converter to extract the channels.

(*) Make sure you are using the V-Ray VFB;
(*) In the Common tab of the Render scene dialog set the resolution to something like 320x240;
(*) In the V-Ray VFB settings, turn OFF the "Get resolution from Max" option for the VFB, and specify the actual resolution that you need;
(*) Turn off the "use memory frame buffer" option;
(*) Turn on the "write raw image file" option and specify a .vrimg file in the field below it.
(*) Turn on the "generate preview" option.
(*) After the rendering is complete, use the vrimg2exr tool to extract the render elements as .exr files. You can find the vrimg2exr tool in the Start menu > Programs > Chaos Group > V-Ray for 3dsmax > Tools. There is also a GUI for it posted in the off-topic section of the forum, I think.

Alternatively, you can simply render on a 64-bit machine with 64-bit 3dsmax and V-Ray.

Best regards,
Vlado

[Candelero]

Check your PM as well.

Best regards,
nikki Candelero

[idtools]

render elements error

it works rendering with the frame Buffer
but we don't understand.
What's the "PM".

[idtools]

THANKS

thank you for the tip of the frame buffer.
Ooops, just check my PM. Thanks for that.

[idtools]

Hi all

As we couldn't be able to extract our channels, from the .vrimg file, we render in the frame buffer with separate channels.
So now, we have our image, and the channels in the frame buffer but when we want record one of these, it crashes "Cannot create bitmap".

So first, can you help us, we have our frame buffer still open (we are doing Viewport captures to extract Channels!!!). Is there another way to record them ?
And then, can you give us an help for extracting the channels from the vrimg.

Thanks

[Candelero]

To extract a channel from the VRIMG file:

> vrimg2exr render.vrimg render_channel.exr -channel VRayReflection


[render.vrimg] - is your vrimg file
[render_channel.exr] - would be your new created EXR file
[-channel] - will extract only a channel
[VRayReflection] - channel name

Best regards,
nikki Candelero

[idtools]

I can't extract integrated channels from my vrimg file.
Here is my command


So I get my 20000.exr file with an alpha channel.
20000_Shadows.exr is created but it's all black
And can't get the RenderID channels.

Do I something wrong or is it definetely impossible ?

I've downloaded the "magicman" lele script and the one from ferdel, nothing more.
I've read that Nuke can be a solution. How it works ?


Thanks for your help
Still in hurry
Arno

[vlado]

Can you extract other channels (e.g. lighting, GI, etc)?

The renderID channel is an Integer channel, and vrimg2exr will not convert that to a RGB image.

Best regards,
Vlado

[idtools]

Thanks for your answer.
I tried with an another file and succeed in extracting the VrayShadows.
But...
The .exr extracted from the Color is overbrighted.
When I convert to -half, the exr issued is still in 32bits.
...

In the future, will it be possible to extract the integers channels ?

Arno

[vlado]

How do you tell if it is a 32- or a 16-bit one? Also, which program are you using to look at the Color channel?

It may be possible in the future to convert integer channels to RGBs as well.

Best regards,
Vlado

[idtools]

That's a good new.

When I open, the file in Photoshop, the frame displays NameFile.exr @10% (RVB/32*).

Thanks for your help.
Arno