RSL Exercises

attributes, options and message-passing

Exercice Ia write a surface shader that takes its color from a user attribute
using: attribute()
Tips:

 
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Exercice Ib

 write a surface shader that takes its color from a user option
using: option()
Tips:

 
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Exercice II

 a surface that is red if visible to raytracing, green otherwise
using: attribute()
Tips:

 
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Exercice III

 a surface that gets its parameter values from a light, and a light shader that gets its parameter values from a surface
using: lightsource() and surface()
Tips:

-this is called message-passing.
-although this type of message-passing is deprecated qith the co-shaders, you should be failiar with it's useage because of the vast number of shaders that used it.
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