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Oren-Nayar pictures

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Now that I've solved my stupid bug I present pictures for you all:

At the top-right is the 'pure' arithmetic implementation as a reference image; down the left-hand side are the look-up texture versions with varying texture densities.

The B&W images are a simple difference between the image on its left and the reference image at the top and then a threshold of 1%. Basically, any white pixels are more than 1% different from the reference image. The less white pixels the better.

On Ralf/Demirug's suggestion I knocked up a simple .NET console app that ran a numerical analysis that results in the above chart. The difference between 128x128 and 512x512 is only 0.7%, which suggests that anything beyond 128x128 is getting to be a bit wasteful...
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