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I ran @DazedAndDiffused's program and got this.
Source: https://bbcmic.ro/?t=9mBje #bbcbasic

I ran @bazzargh's program and got this.
Source: https://bbcmic.ro/?t=9mDls #bbcbasic

@bbcmicrobot @DazedAndDiffused it struck me thinking about your image-where illumination is based on depth-that with an ordered dither you wouldn't need to decide which surface is in the foreground, and I felt that was worth coding up

I ran @geoffl's program and got this.
Source: https://bbcmic.ro/?t=9pmVg #bbcbasic

@bazzargh More bleed through too.

@geoffl another way to get more points is, for each calculation, use it to plot a 4x4 block of pixels (covering all 16 thresholds in the dither pattern). I wasn't sure if that's what your original did since the pixels look fatter - I haven't tried to decode how it works