stl files have flipped face orientation

[tony2guo]

Hi, I am an engineer at Gyro Systems in Taiwan.
These two stl files: tmr_100w_02_c.stl and tmr_ee_c.stl have flipped face orientation, causing Rviz to render the faces incorrectly.

Suppose I flip the normals of the tmr_ee_c.stl, Rviz renders it correctly.