RenderMan Shading Language is a shading language created in 1989.
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Renderman Shading Language (abbreviated RSL) is a component of the RenderMan Interface Specification, and is used to define shaders. The language syntax is C-like. A shader written in RSL can be used without changes on any RenderMan-compliant renderer, such as Pixar's PhotoRealistic RenderMan, DNA Research's 3Delight, Sitexgraphics' Air or an open source solution such as Pixie or Aqsis. Read more on Wikipedia...
float length(vector v) {
return sqrt(v . v); /* . is a dot product */
}