Consider the intersection of two ConvexHullMesh's, m1 and m2.

m1 = ConvexHullMesh@RandomReal[{0, 1}, {10, 3}];
m2 = ConvexHullMesh@RandomReal[{0, 1}, {10, 3}];
intersection = RegionIntersection[m1, m2];

All have a non-zero Volume

Volume /@ {m1, m2, intersection}

And one can obtain RandomPoints on m1 and m2

RandomPoint@m1  (*works*)
RandomPoint@m2 (*works*)

in contrast,

RandomPoint@intersection (*returns CompiledFunction errors*)

CompiledFunction: Argument Region <code>Mesh</code>CrossingCount errors

All run on 11.3.0 for Mac OS X x86 (64-bit)

Update 1: The 2D version of the above works fine without errors.

Update 2: (23 May 2019) Wolfram Tech Support confirms that this is a bug and is investigating.

  • 1
    $\begingroup$ Thanks for informing support about this! $\endgroup$ Commented May 23, 2019 at 19:59
  • $\begingroup$ RandomPoint[TriangulateMesh[intersection]] seems to work around the issue. $\endgroup$
    – Greg Hurst
    Commented May 23, 2019 at 20:18

1 Answer 1


I can reproduce the error, but I don't know what went wrong. This is probably worth a bug report at Wolfram Support.

I found out that BoundaryDiscretizeRegion can help to circumvent the problems.

M = BoundaryDiscretizeRegion@intersection;
  • 1
    $\begingroup$ Your BoundaryDiscretizeRegion workaround does the job in v11.3.0 $\endgroup$ Commented May 22, 2019 at 18:38

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