I have a number of parts in an exploded view, and I'm using difference with a
cube to create a cutaway.
Unfortunately the sliced faces of the parts are all the same green color.

Is there a way to preserve the part color?

Is there a better way to get a cross section that will preserve the color?
I thought about applying the color after the cross sectioning but that would
be a bit of a pain to apply and then remove for each part.

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I was afraid of that.  The model is currently in a dozen files.

I suppose I could put a flag in the dimensions file to trigger the cutaway
before I assemble them in the top level file.

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Ok, I implemented that, but the cut edges are still colored by something that
ends up in a awful looking moire pattern that shifts when I rotate.

//In the dimensions file, I have:
CrossSection = true;

// Example of how I am clipping the parts.  No color is applied in the part
files
module Front(){
difference(){
FrontFull();
if (CrossSection == true){
HalfClip(); // a large box, tall in Z with one face centered on X=0
}
}// end of difference
}// end of module

// So each part is individually clipped in it's own file

// In the main assembly file I apply color.

Explode = 1;

module Assembly(){
union(){
translate([0,0,Explode4]){color ([0.9,0.9,0.9]) Back();}
translate([0,0,Explode3]){color ([0.9,0.1,0.1]) Fill();}
translate([0,0,Explode*2]){color ([0.0,0.0,0.5]) Ring();}
translate ([0,0,Explode]) {color ([0.0,0.5,0.0]) Front();}
color([0.5,0.0,0.0]) Nose();
}// end of union
}// end of module

// No clipping done at the top level where I apply the color.

Assembly();

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I don't quite understand what you mean.

Like this, on each part?

module part(){
render();
difference(){
PartFull();
if (CrossSection == true){
HalfClip(); //
}

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