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I have dozens of vertices and dozens of faces which is why I use the v={};i={} and Graphics3D and GraphicsComplex, which I'll keep for the below example even though it's not necessary in this case. Also I'll specify x,y,z points even though below I'm not using the z dimension.

I'm trying to remove an interior polygon from a face. When I was working with 2D I could specify a colored polygon and then specify an interior white polygon and the latter would override the former, but that's not working for me in 3D. I probably just have it set up wrong.

This is what doesn't work:

v = {{0, 0, 0}, {10, 0, 0}, {10, 10, 0}, {0, 10, 0}, {2, 2, 0}, {2, 5, 0}, {5, 5, 0}, {5, 2, 0}};
i = {{1, 2, 3, 4}};
{Graphics3D[{Red, GraphicsComplex[v, Polygon[i]]} ]    ;   
 i = {{5, 6, 7, 8}}; 
 Graphics3D[{White, GraphicsComplex[v, Polygon[i]]}]}
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Graphics3D[Normal@PolyhedronData["Dodecahedron", "Faces"] /. 
           p : Polygon[__] :> {RandomChoice[{Red, White, Blue, Transparent}], p},
           Lighting -> "Neutral"]

Mathematica graphics

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  • $\begingroup$ I'm sorry, I don't understand this. I want a 10 by 10 square with a 3 by 3 square inside of it removed. Maybe I'm not putting your answer in the right place. This is what I did: v = {{0, 0, 0}, {10, 0, 0}, {10, 10, 0}, {0, 10, 0}, {2, 2, 0}, {2, 5, 0}, {5, 5, 0}, {5, 2, 0}}; i = { {1, 2, 3, 4}}; {Graphics3D[{Red, GraphicsComplex[v, Polygon[i]]} ] ; i = {{5, 6, 7, 8}}; Graphics3D[{White, GraphicsComplex[v, Polygon[i]]}, Lighting -> "Neutral"]} $\endgroup$
    – Howard Wilk
    Sep 30, 2014 at 16:18
  • $\begingroup$ I'm new to this. I don't know what "rep points" are. I just posted this question at community.wolfram.com and attached it there. $\endgroup$
    – Howard Wilk
    Sep 30, 2014 at 16:32
  • $\begingroup$ Now that I tried to move this discussion to chat, I see what "rep points" are--and that I have 1, not enough to chat. Community.wolfram.com had an "Attachments"/"Add a file to this post" so that's what I did. Why don't you post your answer there? $\endgroup$
    – Howard Wilk
    Sep 30, 2014 at 17:06

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