The dialog for the creation of the geometry object ellipsoid includes an "axis" field that requires an [x y z] vector which is defaulted to [1 0 0].
![](https://forum.featool.com/file/n808/default_ellipsoid_dialog.png)
The default settings produce the following:
![](https://forum.featool.com/file/n808/default_ellipsoid_axis_1_0_0.png)
The "axis" vector determines the orientation of the ellipsoid. For these default settings, this vector [1 0 0] is the axis of the largest radii (z, in this case). However, it seems to me that the more intuitive default setting for this "axis" would be [0 0 1] so that the x, y, and z radii settings would be seen/measured along the x-, y-, and z-axis:
![](https://forum.featool.com/file/n808/modified_ellipsoid_axis_0_0_1.png)
The ellipsoid can then be oriented as needed using the "axis" vector:
![](https://forum.featool.com/file/n808/reoriented_ellipsoid_axis_1_2_1.png)
Maybe I am missing the significance of the "axis" vector... but until I figured it out, I was struggling to design an ellipsoid with the x/y/z/ dimensions that I intended.
Kind regards,
Randal