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OS: Linux

License: Freeware, Registration

QTree is a program for generating CPK, Ball and Stick and worms pictures of molecules using the quad-tree algorithm. This is a relatively fast method of generating near-photographic quality images though it does not generate shadows. A sense of depth is provided by darkening atoms farther away from the viewer.

QTree provides many facilities including colouring by residue type, atom type, chain, temperature factor, or residue range, rotation, background colouring, modified lighting models and slabs through the structure. An interactive help facility is provided.

Output from the program is in MTV ray-tracer format which may be viewed or converted into other formats using the ImageMagick package.

The QTree package consists of the following programs:

qtree The main rendering program producing CPK images by default
worms A pre-processor to generate worms images
ballstick A pre-processor to generate ball-and-stick or stick images
cpk A pre-processor used to generate images which mix CPK with ball-and-stick images