If I want to generate a line drawing

[Travis Cobbs]

If I want to generate a line drawing, as shown in the picture, which tool should I use?

I have tried it, pattern creator cannot do this

I only use line meta function.

Do you want a line drawing of an LDraw model? If so, enable edges in LDView as then enable "Edges only".

If instead you mean that you want to create a line drawing as an LDraw pattern, that would be different, and LDraw isn't really designed for that. (In fact, the only lines allowed in official parts are edge lines and conditional edge lines.) It's certainly possible to put lines of any arbitrary color in an LDraw file, but since this isn't allowed in official parts, I'm guessing that's why LDPC won't let you do it.