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MR - how to apply a mask to a material that affect the alpha when rendering?
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  • Jimmy
  • Posted: 13 December 2011 06:42 AM
  • Location: Mantorp, Östergötland
  • Total Posts: 135
  • Joined: 23 August 2006 09:14 AM

Hi! In Vray and Scanline renderer I can use a bitmap to mask parts of ageometry. When trying to do the same in MR I just can’t get it to affect the alpha, just the RGB. This is just basic stuff so I assume that I have missed something obvious.

I have attached a scene.

/Jimmy



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  • Samab
  • Posted: 13 December 2011 07:31 AM

Using the Cutout Opacity slot in A&D material should do it.



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Thanks Samab! “Cutout” did it! I was looking TOO much for “transparency”, “opacity” and “masks”.

/j

Author: Jimmy

Replied: 13 December 2011 08:08 AM  
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  • Samab
  • Posted: 13 December 2011 08:31 PM

With the mr A&D materials, there are two distinct types of transparency which are not the same. The actual Transparency setting, that is refractive transparency as in glass and water and suchlike, where there is substance there, but it’s transparent.
The Cutout opacity is for making holes in the surface with a map, where you want the appearance of there being no substance to that part of the surface, such as mapping leaves, particle shapes or billboard trees.



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