"Edouard Poor" <pov### [at] edouardinfo> wrote:

> All I'm doing is moving the camera to a random offset each render. The offset is
> chosen from the iris image I've superimposed in the bottom right. This one is a
> pentagram, but any bitmap can be chosen.

Interesting technique.  My approach in the past was a physical aperture + focal
blur, or an ugly patch to change the sampling.  I was surprised how long it
took even for simple spheres, as you have here.

> so that the final composition of all the effects is faster than a single render
> with all the elements turned on

With a single render you can use adaptive sampling much like focal blur, but
then you lose out on some of the effects you've mentioned.  Is it really
faster?  Maybe it's the *combination* of effects that slows it down in a single
render.  Interesting.  If nothing else, this method is sure easy enough to
parallelize!

> The picture shows that my code still has some issues - out of focus elements in
> certain areas (towards the edge of the picture near the axes) have some odd
> distortions. I'm going to have to track down the problem on those...

If you mean the lower left, I think it looks alright.  The distortion seems
natural due to the camera angle, and if the specular reflection is distorted,
then a convolution with the aperture image will show the same effect.

 - Ricky

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