Can anyone provide stl files that contains only triangles?

[Yitian-Xian]

Hi all, first of all, thanks for the contributors' support on the joint position control, which is very helpful!

Currently I have encountered with one issue when I am using the realtime_urdf_filter package: https://github.com/blodow/realtime_urdf_filter. When I tried to filter the pointcloud of the robot body, it crashed and said 'Assertion `face.mNumIndices == 3' failed.'. I check https://github.com/blodow/realtime_urdf_filter/issues/36 and found that to use this package, the mesh should only contain triangles.

https://github.com/AndrejOrsula/panda_ign_moveit2/tree/master/panda_description provides an image of the robot collision mesh, from which we can see there are some polygons.

Therefore, can anyone tell me how to fix the stl files so that it only contains triangles? Thanks!!