Unable to draw 3D lines

I tried but only can draw lines on plan. And if there are two points not on a same surface, how can I connect them?

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Currently we don’t have 3d curves. What are you trying to do?

What about straight lines? like if I want to connect the two triangles below with straight lines?

What are you trying to achieve with that? You can’t do that, but probably there is another way to do what you want.