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Description

This is in relation to this question. I am trying to derive this conical figure yet I seem to get an error with this code. I would be happy if someone could point out how to solve this problem

Code

Module[
 {
  R1 = Cuboid[{0, 0, 0}, {5, 5, 5}],
  R2 = Cone[{{0, 0, 0}, {5, 5, 5}}, 3]
  },
 Show[{
   Graphics3D[{Opacity@0.05, R2}], 
   RegionPlot3D[R1, PlotStyle -> Directive[White, Opacity@0.3]],
   RegionPlot3D[
    DiscretizeRegion[RegionIntersection[R2, R1], PrecisionGoal -> 10]
    ]
   },
  Boxed -> False]
 ]

Error

Skeleton is not a graphics directive
Skeleton is not Graphics3D primitive or directive
DiscretizeRegion was unable to discretize the region RegionIntersection

System

Windows 10 x 64
Mathematica 10.3

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11
  • 1
    $\begingroup$ Works in 10.4 and 11.0 (I confirm it doesn't in 10.3) $\endgroup$
    – Szabolcs
    Nov 21 '16 at 11:22
  • $\begingroup$ Is there a workaround to this problem? It seems like the problem lays with DiscretizeRegion but it hasn't been updated since v10.2 $\endgroup$
    – e.doroskevic
    Nov 21 '16 at 11:26
  • $\begingroup$ I don't know. "Updated in 10.2" means almost nothing. I think it refers to the API, not the implementation, and it's missing for several symbols even when the API did change ... 11.0 is clearly better at discretizing regions than 10.2 was. $\endgroup$
    – Szabolcs
    Nov 21 '16 at 11:32
  • 1
    $\begingroup$ The conical output This is an output from my MacBook Pro . I looks like you have something else unintentionally pasted in your notebook. Open a new project and paste exactly the code used here. Can you also attached your notebooks here? Add a SystemInformation[] $\endgroup$
    – Jose Enrique Calderon
    Nov 21 '16 at 13:44
  • $\begingroup$ What version of Mathematica you run it on? $\endgroup$
    – e.doroskevic
    Nov 21 '16 at 13:51
3
$\begingroup$

I am not sure I understand what the issue is and only post this in case it facilitates:

Module[{r1 = Cuboid[{0, 0, 0}, {5, 5, 5}], 
  r2 = Cone[{{0, 0, 0}, {5, 5, 5}}, 3]},
 i = DiscretizeRegion[RegionIntersection[r1, r2]];
 Show[
  Graphics3D[{Opacity[0.3], White, r1, Opacity[0.1], LightBlue, r2}],
  RegionPlot3D[i, PlotPoints -> 50],
  Boxed -> False, Background -> Black
  ]
 ]

enter image description here

Improvements to discretization may be suggested by others.

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2
  • $\begingroup$ Thank you for your reply, but it doesn't work in version v10.3. Up-vote for the effort! :P $\endgroup$
    – e.doroskevic
    Nov 21 '16 at 13:35
  • $\begingroup$ @e.doroskevic ok. I hope others can be helpful. Good luck:) $\endgroup$
    – ubpdqn
    Nov 21 '16 at 13:37

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