Some functions, like convex-hull computation or graph visualization, are implemented in several fashions, using
different algorithms, libraries, or visualization engines. The choice between the implementations can't always be made
from the sole algorithmical complexity point of view; instead, you are allowed to establish own preferences, based
on your subjective taste.
Let's recall that permanent preference settings can be made using the interactive prefer and reset_preference user
commands, as well as by manual editing the user's private file ~/.polymake/prefer.pl.
Temporary changes are made by calling prefer_now,
they hold until the user script finishes, or the current input line in the interactive mode is interpreted completely.
Use JavaView - default tool for the visualization of 3- or 4-dimensional geometric objects.
You can also use it for graph visualization. The 3-d spring embedder starts with random node placement, so
you have a chance to get various embeddings when trying it several times.