Earlier I reported that enabled the RLE to work both forwards and backwards had slowed it down considerably. As it turns out I had simply broken it, which I have now fixed.
On the above image, a standard single-thread render took 1.32 seconds. With RLE enabled, it took 0.64 seconds. This is slower than previous times quoted for the skull, as this render contains a lot of non-empty voxels.
In order to improve this further I have added a setting where voxels that are surrounded by other solid voxels and therefore are not visible are considered empty, and not rendered at all. This lengthens the pre-processing of the volume, though not by an unacceptable amount. The rendering time for the above image was reduced further to 0.13 seconds.
I have not been able to test it on a multi threaded render yet.
I also added a linear interpolation sampling when warping and scaling the render to fill the screen. This helps to remove some artifacts and give a generally smoother (though blurry) appearance. Render time with this option enabled increased slightly to 0.15 seconds.
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