How to get model 2d/3d pre picture?

[leilei]

Hi,I am writing an import model plug-in to generate GDL.I can get the geometry information and write it into 2D / 3D script.Now I can get the geometry information and write it into 2D / 3D script, but I want to get the preview picture of the model and add it before generating GDL,How to do it?
Just like the GDL pre interface, I just get the geometry information and generate a preview picture.