Hi all,

   I am using volume rendering with ray traced technique.  I saw black color 
along the edge of image.  I checked the shader code.  There is a variable 
called fragColor and initial value is set to  vec4(0.0, 0.0, 0.0, 0.0);.  I 
would like to know why this value is using black on initial.  Should we use 
background colour for the initial?  Thanks.


Regards,
Clement Chu
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