Why the model seems need a rotation?

[HouxiongYao]

I have run the code with 1-3-1.obj ,and belowing is the results: If I delete 1-3-1.obj,here is the paths: It seems like that if rotate the paths 90 degrees, the visualization will be just perfect. But I really don't know the reason or how to fix it.

[penickar]

When you import an obj file to the Blender you need to specify transform to be Y Forward and Z Up, see here:

[HouxiongYao]

When you import an obj file to the Blender you need to specify transform to be Y Forward and Z Up, see here:

Thank you! This method successfully solved my problem！