A better alternative is the option of conditional super-sampling done using an algorithm like the one that Frederik uses for disk renders in Ultra Fractal.
This is more complex in programming terms but only computes extra pixels where necessary (as dictated by the user AA options) so is pretty much optimum in performance terms.
Possible method:
1. Render at given siize as normal.
2. Now scan pixels/pixel diffs to decide where over-sampling is required based on the desired AA settings and perform extra pixel calculations as necessary - storing extra data in small buffer with location info. Note that this could be recursive such that if the user has specified a max. of 4*4 oversampling with a threshold limit of x then where the limit is not met you perform 2*2 first then if the limit is still not met you go to 3*3 and so on, ending at the user specified max such as 4*4.
3. Use extra pixels to apply AA to the standard render (in 1).
Of course if the user specifies a threshold limit of zero then you need to use Ray's method in any case
March 01, 2013, 07:41:31 PM
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