hi, i would like to get some guidance on how to convert a 2d point to 3d? I am planning to get an array of 2d points and draw a 3d model according to that 2d points

It’s not clear what you mean, 2d point means a point on the screen.
You can unproject that point and obtain its position in 3d space but you need to indicate the Z value.

If you don’t indicate the Z value you’ll obtain a planar object
So you want to draw a planar object?

Anyway you can convert 2d screen coordinates to 3d scene coordinates using