Nested transparency in OpenSCAD output

Question

Transparency in OpenSCAD output can be achieved by prepending % to elements, but this doesn't allow to put a transparent element in a surrounding element with a higher degree (e.g. expressed in percentage) of transparency and make it possible to see an (opaque) element in a transparent element inside a transparent element. How to do that?

Answer 1

the a-value of color([r,g,b,a]) can be used to control transparency, e.g.:

color([0.5,0.5,0,0.8]) cube(size=[10,10,10], center=true);
%cube(size=[20,20,20], center=true);

or with different colors:

color([0.5,0.5,0,0.8]) cube(size=[10,10,10], center=true);
color([0,0.5,0.5,0.3]) cube(size=[20,20,20], center=true);