OBJ file format.

For this raytracer I chose to import the OBJ file format as the easiest one to parse.
So here is the first draft implementation of the importing of vertex positions.
This simple code is ready to use, the form is: (take-vertexes "test-file.obj")

Random rays.

Trying to generate random rays, I have got a problem.
Basically I had few ways to get a 'random' vector or in other words a random point on the surface of the unit sphere.

Renderman.

It seems that if I want to follow industry standards, I have not too much to choose from. It is either Renderman or Mental, or Blender, or something like Cg or alike. Yes, I know that they are "of different type", but my problem is to choose something distant just to set the direction. I have no preferences, and so after talk with one guy, the Renderman was chosen. Yet I have no idea about reyes and other renderman-specific things, but I will find it out.

Direction.

I thought a bit about this task and more and more I like the Haskell with its laconism. And more and more I see that LISP is pretty weak here comparing to the Haskell. But on the other hand, as LISP has weakness here, it has a strength somewhere else. And I believe, it is macros. Just because the LISP has nothing special else.

So now my idea is to pay as much attention to macros as possible. I don't want to put them just everywhere, but simply to make the language more laconic.

And one more thing, but not the least. I decided to implement the support of some already available shader language just to be able to use the code already written for this lamguage. I am still deciding which language to chose.