I encountered an issue using RegionPlot together with rotated regions. Notice how as long as one drags a slider in this simple Manipulate the plot behaves as one would expect, but reevaluates as soon as the slider is let go (and takes an suspiciously long time doing whatever it does). This question might, or might not be relevant (using DiscretizeRegion does not fix anything in this case however).

parabola[a_, b_] = ImplicitRegion[x - b y^2 > a, {x, y}]

TransformedRegion[parabola[a, b], 
RotationTransform[w, {a, 0}]], 
PlotRange -> {{0, 5}, {-3, 3}}], 
{a, 1, 2}, {b, 0, 2}, {w, -45°, 45° }]
  • $\begingroup$ I get the same, however evaluation takes about 2secs and evaluates to a slightly different result than before evaluation. Most importantly, changes in w are reversed after evaluation. Linux, 10.4 64bit, 16gb RAM, NVidia I had to quit kernel 2 times before it rendered properly, but that's I think a Linux-NVidia issue. $\endgroup$ – Feyre Jun 27 '16 at 11:51
  • $\begingroup$ I get this crashing my kernel if I move the b slider. I can actually get the kernel to quit even without using Manipulate just by evaluating RegionPlot[ TransformedRegion[ImplicitRegion[x - .5 y^2 > 1, {x, y}], RotationTransform[\[Pi]/4, {1, 0}]], PlotRange -> {{0, 5}, {-3, 3}}] - I'm on version 10.3.1 Mac $\endgroup$ – Jason B. Jun 27 '16 at 13:30

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