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Alpha transparency not working

Thu, 26/04/2012 - 01:52 — comeinandburn
Project:YafaRay
Version:0.1.2-beta1
Component:Blender Exporter
Category:bug report
Priority:normal
Assigned:Olaf
Status:by design
Description

Alpha channel

I've tried on Mac OSX, and Window 7 64 bit, both with 2.62 and Yafaray 0.1.2 combo.  I've tried using the existin alpha channel as well as a separate Diffuse and Alpha channel.

 

Alpha mapping not workingMaterial settingsDiffuse

 

I've tried with images that contain an alpha channel and this doesn't work

AttachmentSize
LeafAlphaProblem.zip355.84 KB

Comments

Thu, 26/04/2012 - 15:51 — Olaf

#1

Thu, 26/04/2012 - 15:49 — Olaf

#2

Assigned to:Anonymous» Olaf
Status:active» by design

I have updated your blend.file. So now it works fine here with latest exporter and Blender CVS:

 

 

updated .blend: http://dl.dropbox.com/u/21229169/LeafAlphaProblem.7z

 

HTH, Olaf.

Thu, 26/04/2012 - 21:58 — comeinandburn

#3

Hi Olaf,

 

   There is still strange behaviour even after your updated file.  In order for this to work you have assigned the BW image to translucency but it needs to use a negative value (-1.00).

  I tested the use of a single image texture with included alpha channel (.png) and something else bizarre happened.  If I select "use alpha" and set a positive (1.0) value in the transparency I get an inverted result (the centre disappears).  When I uncheck "use alpha" it works but leaves a premultiply type of result with the material fringes on the edges.

  Finally if I check "use alpha" and then use a negative (-1.0) transperancy value all is well with a single channel.  Funny behaviour which should likely be addressed since it's quite confusing.

 

thanks for looking.