#1 Flexible sampling class

[Andreas Kahler]

Flexible sampling class
* at the moment only used in RAYTRACER class for
subsampling/anit-aliasing
* apart from uniform sampling: random and stratified
* prepared for adaptive sampling, but not implemented
yet
* will be needed later for path tracing

To apply the patch
cd xxx/raypp
patch -p2 -u -i samplepatch.txt

On Window additionally use the -l option

[Andreas Kahler]

Flexible sampling class

[Andreas Kahler]

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I added sampling to phongtest if you want to try it out.