I have uploaded to hackage a new version of my ray-tracer, Glome. In previous releases, Glome was a monolithic application. In this release, the core algorithms have been abstracted out into a pair of libraries, GlomeVec and GlomeTrace. GlomeVec is a vector library. It's not necessarily any better than any of the other vector libraries on Hackage, but it's fairly simple and does what I need it to do. Also included with GlomeVec is a solid texture library, which has a perlin noise function that may be useful for other projects. GlomeTrace contains constructors for building scenes out of basic primitives like spheres, cones, triangles, and grouping them, moving them around, and performing boolean operations on them, and functions to test rays for intersection against these objects. It also has some higher-level operations, like tracing a ray corresponding to a certain x/y coordinate within the camera's field of view, and returning the color by recursively tracing rays against the scene. (Recursion comes into play if the object is reflective.) GlomeTrace uses a typeclass called Solid for geometric primitives, and the composite primitives that are built up from other primitives use an existential type SolidItem that is just a container for all types that are instances of Solid, so it should be quite easy for an application to add new primitives of its own and have them integrate nicely with the ones that are already defined, just by making them instances of Solid. One very useful composite primitive is a BIH (Bounding Interval Hierarchy), which is a type of automatically-constructed tree of bounding volumes used to speed up the process of tracing a ray against many objects. Constructing a bih is easy: just pass a list of SolidItems to the bih constructor, and it returns a "Bih" object that is itself a SolidItem, so you can trace rays against it as if it were a single primitive. GlomeTrace and GlomeVec now have (partial) haddock documentation so it should be easier to understand the code than it was previously. There is also a (somewhat out of date) tutorial linked to from the Haskell wiki: http://www.haskell.org/haskellwiki/Glome Glome the application requires OpenGL for display, but GlomeVec and GlomeTrace do not. -jim Packages: http://hackage.haskell.org/package/GlomeVec http://hackage.haskell.org/package/GlomeTrace http://hackage.haskell.org/package/glome-hs