wong shek

Error while rendering simple polygon model

1

- Version&Platform: MeshLab2021.10-windows.exe - Data: [poly_model](https://github.com/wsh2021/FILE/blob/main/outer_facades.ply) Maybe triangulation error? 

Faces normal reverse after triangulation ？

21

**Describe the issue** Import a polygon .obj file with triangulation (earcut option on), then export to .off, but some face normal reverse. **To Reproduce** - Minimal files [ZH2.obj](https://github.com/wsh2021/FILE/blob/main/ZH2.obj) [ZH2.mtl](https://github.com/wsh2021/FILE/blob/main/ZH2.mtl) -...

Need a trackbar control mode

2

Could you add a trackbar control mode to this great viewer, just like meshlab~ The default mouse and keyboard control modes are a bit uncomfortable to use now :(