coordinate system

[derrick-xwp]

Dear author,

can you give more explainations to following two coordinate system?
x_down_y_down_z_cam_dir
x_down_y_up_z_neg_cam_dir

How can I draw to visualize the xyz axises?

Thanks

[mhfy6868]

Same issue,
for "x_down_y_down_z_cam_dir" and
"x_down_y_up_z_neg_cam_dir", looking for some explainations.

Thanks