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Mental ray baked normal map aliasing?
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  • goonp
  • Posted: 26 April 2012 12:50 AM
  • Total Posts: 67
  • Joined: 16 June 2008 02:27 PM

Mental ray does well with everything single smooth group model but when you want to bake a texture from several scattered things on a surface they always look aliased whatever you have in Sample per Pixel panel.

Am I missing something?  Is it a bug? Have it been fixed in modern Max versions?


win7-64, Q6600, RAM 5gb, Gforce 9800gt 1gb, 3dsmax 2008

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just render at a larger resolution and down sample in photoshop

Author: hoganburrows
Replied: 26 April 2012 11:28 AM  
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Is there a reason you have to use mental ray to bake the maps?  I’ve often had problems with mental ray baking normal maps and I just switch to the scanline renderer and enable the global supersampler and set to Hammersly.


3ds Max 2013, Maya 2013
Windows 7 Ultimate 64 Bit
Core i7, 12GB RAM
Nvidia Quadro FX 3700 (Driver 297.03)

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I do as you offered. The problem only is that I am accustomed to use mental ray light sources and daylight system and mental ray shaders as materials and have to use shell material for scanline.  Beside Scanline ignores any displacement on a material while baking unless it’s a true geometry.

I am curious whether it’s fixed in Max 2013 ?  I have Max 2008

ps. Another thing that bothers me a lot is that Max baker seems to render every texture square. So if I need to get a texture 128x2048 pixels it nevertheless do it 2048x2048 and then rescale it to what I requested.  It sometimes takes just forever with a decent sampling quality.  Does it still work the same way?

Author: goonp
Replied: 26 April 2012 05:48 AM  
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I have not found a solution to the aliasing issue.  Mental Ray seems to just ignore the sampling in the render setup, and I can’t find any other place to adjust it.  I see this problem all over the place when I google it.

I am able to render out a non-square image.  But it still takes the 0 to 1 texture space (square) and compresses it to fit the non-square render.


3ds Max 2013, Maya 2013
Windows 7 Ultimate 64 Bit
Core i7, 12GB RAM
Nvidia Quadro FX 3700 (Driver 297.03)

Replies: 1
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Thanks for the info, Valen.  Do sombody know other good programs to bake textures with a support of cage/envelope geometry to adjust projection rays?  Maya?  XSI? Houdiny?  I am curious whether there are any better solutions than Max one?  Texture baking is a key thing in my work.

Author: goonp
Replied: 27 April 2012 03:33 AM  




   
 
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