I use " selectInput()" to load big file in app. Can it run on background and show the Progress Bar or Image?

Has anyone do something like that? Or any idea?

Thanks...

Now I work on a 3d project with processing + toxiclibs. It's need reduce vertex number when the model is too large for performance.

I check all contributed libraries on processing.org, and can not find way to do that. But I find Meshlab can do very good "reduce operation" with "quadric edge collapse decimation".