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Thank you! As someone with no prior Maxima experience, those were some great starting points for me to learn and explore!

Note `plot3d(...);` doesn't seem to work: the output image is missing/broken.

you probably didn't define the function, f(x,y), which is the line before plot3d. it's a slightly buggy behavior

Ah, yes, can reproduce the problem if f(x,y) isn't defined.

Also, if f(x,y) is "broken" (e.g. by a typo like syn instead of sin) then the effect is the same.

plot3d did work for me (on Chrome). Impressive.