Further Notes on Entity Selection
Further Notes on Entity Selection
"Hover over": showing what will be selected.
By default hovering the cursor over a row in an object menu will also highlight and label the item on the screen, helping to identify where in the model the item is.
Resolving ambiguous screen picks.
When screen-picking you may occasionally pick a point that does not lie unambiguously on an entity. In this case the "ambiguous pick" menu, see the figure (right), will be mapped, and you will be forced to choose an item. You can:
- Choose a menu item: the top one is always nearest to the point you picked, or:
- ect this pick: the pick is ignored and you get another chance.
- Take items from the menu list.
- Show these items are by labelling them.
- Abort the whole picking operation using .
Treatment of 3D elements during Area or Polygon pickingcontrols how 3D elements are treated during screen area type picking. (This does not affect single picks, which will always take the nearest element only.) |
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| All eligible elements in area |
By default area picking of a mesh that contains solids or thick shells will include elements that are eligible for display, but which have not actually been drawn because they are interior to the mesh. You can think of this as all elements in the "tunnel" behind the screen area: blanking in this way will punch a clear hole right through the mesh as shown in this example. |
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| Only external elements |
Alternatively only those elements which have actually been drawn, for a 3D mesh the ernal surface, will be selected: elements culled from the display because they are internal are not selected. The effect of a pick in this mode is like peeling an onion: only the outer layer is removed in each selection pass. Contrast this example with the image above: only the outer layer of solids has been removed. |
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