Am 14.04.2015 um 12:59 schrieb Doctor John:

> I seem to remember someone having a similar problem with the white spots
> a few years ago, possibly on this very ng. I'll search my archives to
> see if I can find the relevant thread.

I recall one guy who had stray white dot artifacts all over his scenes; 
in the end it turned out that his AMD processor had suffered permanent 
damage from overheating. (Some time later, the very same guy complained 
about the very same type of artifacts again; it turned out that he had 
fried yet another CPU.)

But I don't think that's the issue here. The white dots are clearly 
limited to a particular feature of the scene (the surf); also, at the 
far bottom right we can see how the white more or less gradually blends 
into the dark blue of the lake, probably due to anti-aliasing. The 
overheat artifacts didn't behave that way.

My personal guess would be that the water surface texture isn't properly 
limited to the flat water region, but extends a bit up the beach slope.

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