Just for fun, have a battery: color("red") difference() { cylinder(d=50,h=100); cylinder(d=20,h=105); translate([0,0,-5]) cylinder(d=40,h=100); translate([0,-1000,-500]) cube(1000); } color("silver") difference() { cylinder(d=40,h=95); translate([0,0,5]) cylinder(d=30,h=95); translate([-0.01,-1000+0.01,-500]) cube(1000); } color("green") translate([0,0,5]) difference() { cylinder(d=30,h=90); translate([0,0,5]) cylinder(d=20,h=90); translate([-0.02,-1000+0.02,-500]) cube(1000); } color("gray") translate([0,0,10]) difference() { cylinder(d=20,h=95); translate([-0.03,-1000+0.03,-500]) cube(1000); } - Revar > On Feb 7, 2021, at 3:27 PM, Revar Desmera <revarbat@gmail.com> wrote: > > Ahhhh. I see. If the removed cube has coincident faces to the other parts, the last cube’s color wins. You can get the result you want by making the cubes very slightly offset from one another. > > color("red") > difference() { > cylinder(d=50,h=100); > cylinder(d=40,h=1000, center=true); > translate([0,-1000,-500]) cube(1000); > } > color("green") > difference() { > cylinder(d=40,h=90); > cylinder(d=30,h=1000, center=true); > translate([-0.01,-1000+0.01,-500]) cube(1000); > } > > <Screen Shot 2021-02-07 at 3.26.58 PM.png> > > - Revar > > >> On Feb 7, 2021, at 3:20 PM, Revar Desmera <revarbat@gmail.com <mailto:revarbat@gmail.com>> wrote: >> >> Odd. It works for me in OpenSCAD 2021.01 (OS X): >> >> color("red") >> difference() { >> cylinder(d=50,h=100); >> translate([0,-1000,-500]) cube(1000); >> } >> >> <Screen Shot 2021-02-07 at 3.18.50 PM.png> >> >> - Revar >> >> >> >>> On Feb 7, 2021, at 2:29 PM, jon <jon@jonbondy.com <mailto:jon@jonbondy.com>> wrote: >>> >>> Great suggestion. But it does not work... >>> >>> <mcgpbpmffakdoboa.png> >>> >>> I have four sections like this: >>> >>> color("red") >>> difference() { >>> Plunger(); >>> translate([0, 0, -20]) >>> cube(1000); >>> } >>> >>> There are four objects, colored red, blue, green, and orange. The internal color is always the color of the last object. >>> >>> Puzzling >>> >>> >>> >>> On 2/7/2021 5:12 PM, nop head wrote: >>>> I think the only way is to make four separate differences and colour them. >>>> >>>> On Sun, 7 Feb 2021 at 22:11, jon <jon@jonbondy.com <mailto:jon@jonbondy.com>> wrote: >>>> I am making an assembly for a customer consisting of 4 interlocking parts. I colored each and then cut into the assembly with a difference() of a cube(), expecting the colors of the parts to persist throughout the entire part. Not so. >>>> >>>> <bdmbalicpfleleoa.png> >>>> >>>> I don't know if this would be feasible, but the utility is obvious. >>>> >>>> Anyone know of another way to visualize a series of parts like this? Think of it as a complex syringe... >>>> >>>> >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >>>> >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >> >

On 2/7/2021 3:11 PM, MichaelAtOz wrote: > To clarify, technically there is no interior colour. ATM colour is a > surface property of the faces of the object (ie the triangles or > polygons). The colour of the faces resulting from a difference, ie the > cut face, has the colour of the negative object. Hence, as above, cut > face of Shape1() is blue. See issue #1608:  https://github.com/openscad/openscad/issues/1608