perf(slice): reduce memory allocation + replace stack #7
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The slowest part of the slice operation is the plane allocation, which is very large because it is was simple to not assume which direction will be drawn on.
(512 * sqrt(3) * 2 * anisotropy(10))^2 * 8 bytes = 2.5 GB
However, if we calculate the plane area we actually need, only a fraction of that allocation is needed.
With a smaller plane, there is no need to use a stack. We can just use regular loops.
The main issue here is whether I did the calculation right. So far so good...