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+--- Thread: MultiPolyLineVisual3D and hit test area (/showthread.php?tid=4065)
MultiPolyLineVisual3D and hit test area - tim.rutter - 01-05-2018
I was wondering if there is a convenient way of increasing the hit test area of a MultiPolyLineVisual3D? The only solution i can think of is to duplicate the MultiPolyLineVisual3D and make this duplicated line transparent with a bigger LineThickness and use this for handling mouse over/click events and then perform actions on the associated visible line. I'm using the EventManager3D for event handling. The problem with this is doubles the number of lines I have on screen which adds overhead.
RE: MultiPolyLineVisual3D and hit test area - abenedik - 01-05-2018
One way to do that is to add thicker and transparent 3D lines (as you have suggested).
But a better way is to convert line's 3D positions into 2D screen positions and then get the closest line from mouse position in 2D space.
A sample on how to do that can be found with the samples that come with Ab3d.PowerToys library - see "3D lines" - "3D line selection" sample.