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exr exports linear?
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  • Total Posts: 5
  • Joined: 30 August 2006 12:56 AM

Anybody know if mudbox exports it’s exr texture files as linear?

thanks



Replies: 0
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  • oglu
  • Posted: 25 March 2010 05:59 AM

what do you mean by linear.?



http://www.linkedin.com/pub/christoph-schaedl/6/558/73b

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  • 2byts
  • Posted: 26 March 2010 12:27 AM

32 bit EXR for displacment maps is independant of rendering in linear space.

In fact, all scalar maps are independant -bumps and spec maps included, and they do not need to be gamma corrected.

The only time you may want to use linear space is for painting the color maps but your monitor will display in non-linear, and any photo textures be non-linear, and editing textures in photoshop will be non-linear (exr is severely limited in photoshop) so you will not be able to accurately judge the color values unless you adress all of these issues.

In short, when texturing....its simpler to work in non-linear, and gamma correct at the lighting/rendering stage.

Rendering in linear space is only for getting more accurate and controllable lighting.  But because of the hardware limitations, texturing in linear space is next to impossible.



Replies: 1
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Thanks, for the reply. I realized I could answer my own question by exporting both a jpeg and a 16 bit half float exr and comparing them in nuke. And yes, they are the both gamma encoded. In fact I can’t see any difference whatsoever.

So I guess from this we conclude that mudbox is doing all of it’s texture painting in 8bbc? Do you know if that is correct?

Rendering in linear space is actually the *only* way get accurate lighting. So we do gamma correct all gamma encoded texture maps and use lens shaders in maya.

Author: corestudio

Replied: 26 March 2010 02:49 AM  
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Mudbox does its painting and processing in the bit depth of the target texture layer. So it can be 8bpc, 16 bpc int, 16 bpc float, and 32bpc float.

Mudbox is not doing any gamma correction on these texture layers.



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Great, thanks Ian. we try to keep to 16bbc float as much as possible so we’ll go that route.

Author: corestudio

Replied: 26 March 2010 08:53 AM  
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When you export a layer it’s not linear color space ?



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  • 2byts
  • Posted: 12 October 2011 12:34 AM

scalar maps such as displacement, bump, and spec are in linear.  Color maps are sRgb because you are painting in sRgb (your monitor color space)



Replies: 1
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That is correct.

Author: A.Baroody

Replied: 12 October 2011 05:43 AM