There seems to be a huge memory leak which becomes noticeable if you use focal
blur on a scene with high-frequency noise. I suspect it's not cleaning up all
the additional rays it fires per pixel, and noisy scenes need a huge number of
rays.

Here's a simple example scene:

camera {
 location -z*4

 aperture 0.2
 focal_point 0
 blur_samples 64
 confidence 1 variance 0
}

light_source { <-1,1,-1>*100, rgb 1 }

sphere { 0, 1 pigment { crackle solid scale .001 colour_map { [0 rgb x][1 rgb
x+y] } } }
cylinder { -y, -y*2, 3 pigment { rgb z } }
background { rgb .7 }

Watch pov's memory usage when it starts tracing against the sphere.

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