Here’s the script:

when green flag clicked
forever
3D engine
Point towards (mouse pointer v)
end

define 3D engine
erase all
go to x: [x] y: [y]
repeat [number]
stamp
change y by (1)
end

3D engine is run without screen refresh and you can name it whatever you want. It’s your project. You can also edit the 3D block. By adding more repeat blocks and adding switch costumes. And if you want to look normal, then you have to reset the costume when you start.

You're not allowed to make guides on the New Scratchers forum

Hello! It's great that you want to help out other Scratchers. However, I think we have enough guides in the forums at the moment. Please feel free to welcome new Scratchers on the group welcoming topic or on individual topics created by New Scratchers.

Other places that can always use more helpful Scratchers like you, are the "Help With Scripts“ and ”Questions About Scratch" areas - please use them as designed, by responding to topics created by folks with problems to solve

Finally, a really good place for Scratch guides is the Scratch Wiki - check it out and see if it's something you might like to work on. They have a number of guides - and great organization.