opengl - How can I draw a half torus? -

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I'm reading OpenGL Game Programming from the tutorials on the Net itself. I want to draw a semi torus like this can look like a gateway, how can I do this, is anyone involved in mathematics? Most tutorials show online how to attract a full torus.

Set as appropriate ([0,0,1, 0] should work, assuming + Z 'up') and attract a complete Torus.


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