Items tagged with torus

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Try this command.

display(semitorus([0, 0, 0], 0 .. Pi, 1, 2), lightmodel = light4, orientation = [-140, 60], scaling = constrained, style = patchnogrid)

I get this mess. The picture on the help page doesn't look any better.Setting the range 0..2 Pi looks fine though. So I think it is a bug.

What I was trying to do is plot 3/4 of a torus i.e circle disk swept in 3/4 of a carcle with capped ends. What is a good way?

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