Camera Shader: altering default camera

Cross22

I am looking for documentation or examples on how to alter the default camera behavior using shader mixer.

For the sake of argument, let's say I like the default renderer, but I would like to add a checkerboard pattern on top of the output image. We have a generator for checkerboards and various mixer / math bricks. So that part is straight forward.
What I don't know is where to get the default color/opacity values from? Is there a brick or variable for that?
Once I have blended the values- what is the output/root brick to attach my color & opacity values to ?

Cross22

There were two things I did not realize:
a) varyings are made available via the "Variable(Fixed)" block
b) 3delight is just a renderman implementation, and camera shaders correspond to Imagers

Looking up the renderman specs I can probably pull out the necessary information:
https://renderman.pixar.com/resources/RPS_16/index.html?url=standardShaders.html

I wish there was a way to print out values for debugging purposes- that would make it easier rather than trying to guess what coordinate spaces are being used.

The DigiVault

Hi grubertm.

I came across this a while ago....not sure if it'll help but you never know.....

http://docs.daz3d.com/doku.php/public/software/dazstudio/4/referenceguide/interface/panes/shader_mixer/bricks/dzsimplefogbrick/start