The problem here is that you're using single quotes instead of double quotes. Single quotes are interpreted by the shell (i.e., before 3dbucket is even running) to mean "I want exactly this text; don't interpret it further", while double quotes mean "I want to do variable and command substitution on this, but nothing else". So both kinds of quotes prevent the brackets from being interpreted as a glob, and prevent a word from being split in two at a space, but single quotes also prevent substitutions.
For reference, here are some relevant manual sections:
quoting in bash
shell expansions in bash
lexical structure of tcsh
