RSL exercises - basic functions

RSL Exercises

basic functions

Exercise Ia	write a basic surface shader
using:	ambient(), diffuse() and specular()
Tips:
-specular is traditionally not multiplied by the surface color, but have its own tint. -Ci *= Oi;

Exercise Ib	same as above, but with a color texture and a specular map. if an alpha channel is present in the texture map, use it as opacity map
using:	texture(), textureinfo()
Tips:
-Oi is a color! -You only need one channel (greyscale) in your specular map.

Exercise IIa	a facing ratio surface shader
using:	dot product, normalize()
Tips:
-dot product of two normalized vectors give the cos of angle.

Exercise IIb	a surface that is green if the normal is facing the camera, red otherwise
using:	dot product, normalize()
Tips:
-dot product of two normalized vectors give the cos of angle.

Exercise IIIa	a surface that outputs P in world space,or N camera space
using:	transform(), ntransform()
Tips:
-try to avoid negative values to get into your image. Remapping from [-1-1] to [0-1] can be done with a scale and an offset.

Exercise IIIb	a surface that prints the NDC coordinates of the shaded point
using:	transform() and printf()
Tips:
-read note on the shading grid

Exercise IV	a surface that implements a procedural tile texture, with a bump
using:	calculatenormal(), and any mathematical functions you fancy, (e.g. sin(), abs(), mod(), min(), max(), mix(), etc)
Tips:
-use smoothstep() to reduce aliasing

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