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Feb1-12, 09:39 AM
P: 1
I have struggled with bad resolution and quality in RegionPlot for a long time. In particular this is a problem for complicated multiple conditions. The way to solve it is to add PerformanceGoal and MaxRecursion:

RegionPlot[ f(x,y)>0 && g(x,y)>0, {x,xmin,xmax},{y,ymin,ymax},
PerformanceGoal -> "Quality", MaxRecursion -> 8]

I suspect that the default values are PerformanceGoal -> "Speed", MaxRecursion -> 1. The speed and quality seems to be very sensitive to MaxRecursion, so experiment a bit with different values.

( google keywords: resolution RegionPlot Mathematica )