[Fluxus] vec 3/4 vs opacity

[Dave Griffiths]

> i've been thinking about how to sort out the 3 and 4 element colour
> vector issue. there's a conflict with (opacity), since alpha values are
> overwritten by the value set with (opacity). what is preferred, should
> we ditch (opacity) completely? or (opacity) could work as a multiplier
> to colour alpha values, but probably this would be more work. if we can
> agree on the preferred way of working, i'd like to take on this task.

is it possible to make (opacity) just overwrite the alpha element for the
current colour? - calling (colour) with a three element vector should just
set the first 3 elements.

this would mean (opacity) would be unnecessary, but it's behavour is
retained for compatibility.

cheers,

dave