Dear Michael,

I did the following steps:

1. Created a sphere.
2. Created a plane.
3. Used the trim tool to divide the sphere into two unequal parts.
4. "Kept" only the shallow, dish-shaped part.
5. Highlighted it.
6. Clicked "show points".
7. A square-ish grid of points appeared.
8. Pulled one of them to make a pointy, egg-shaped dish.

Perfect till this juncture. But all points disappeared, never to return.
The only way to make them return was to undo, undo until the point-grid appeared. Then I got to change ANY one point, and the grid vanished, the points were gone.

...and all the king's horses, and all the king's men,
...nor all the perfumes of Arabia, and certainly not
...all my piety nor my wisdom,

could get the points back.

Tried this in Sept. and Oct. Betas; same result. What am I doing wrong? Or it is a bug?

Nariman.

Hi Nariman, it sounds like a bug. If you can please post the .3dm file that contains this object it would help to track down what is happening. (in general posting a model file is a big help, it makes it easier to examine the situation).

The bug is probably triggered because by moving the point probably a sharp crease is forming inside the object. When this happens MoI will cause a surface to be split into 2 surfaces at the crease (which are joined together at the crease line). There is a restriction in MoI where you can only turn on points for objects with more than one surface in them if the surfaces have the same point structure along their shared edges. This should be the case here, but it seems that this part is where there is a bug that you're running into.

As a quick work-around for the bug, select your object that won't have points turn on, and use Edit/Separate on it. This will break apart the object into individual separate surfaces, and you should always be able to turn on points for a single individual surface.

- Michael