[osg-users] Raytraced shader code

[Clement.Chu at csiro.au]

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