Region Plot with more than two functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg124474] Region Plot with more than two functions*From*: Gabriel Landi <gtlandi at gmail.com>*Date*: Sat, 21 Jan 2012 05:13:09 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

Dear Group, Consider the following two examples from the RegionPlot documentation (Under PlotStyle): p1=RegionPlot[(x + 1)^2 + y^2 < 2 || (x - 1)^2 + y^2 < 2, {x, -3, 3}, {y, -3, 3}] p2 = RegionPlot[{(x + 1)^2 + y^2 < 2, (x - 1)^2 + y^2 < 2}, {x, -3, 3}, {y, -3, 3}] At least in my system (Mac OS 10.7, Mathematica 8.0.1), the quality of the graphs are entirely different. Moreover, if I wrap them in a GraphicsGrid, p2 appears with it's mesh wheres p1 doesn't. GraphicsGrid[{{p1}}] GraphicsGrid[{{p2}}] This seems like a problem with Opacity, for if I insert PlotStyle -> Lighter[ColorData[1, "ColorList"], 0.75] into p2, the problem is solved. Is this a bug, or am I missing something? Thanks in advance, Gabriel