Algodoo

Here's a slightly more advanced (and more convenient) way of handling the colors:

1. Create the following local variables in the small box (type the following three lines into the text box in the upper left of the script menu):

_Red := [1,0,0,1]
_Green := [0,1,0,1]
_Blue := [0,0,1,1]

After entering those three lines, you should now see three new local variables in the script menu.

2. Now you can decide which color that you want other geometries to change to during collision with the following onCollide script. For example, if you want Red, just use the following script:

{e.other.color = _Red }

If you want Green or Blue, just use {e.other.color = _Green} or {e.other.color = _Blue}. Now you do not need to remember which arrays are used for which colors ([1,0,0,1] is an array). Just type the actual name of the color, starting with the underscore character!