brushing overplotted points

[dicook]

when points are overplotted the ones underneath fail to get coloured.

[casperhart]

There should be room to improve this, but I don't think it can be solved with the way brushing works.

Currently two scenes are rendered: the main one which is displayed, and a 'picking' scene which is invisible. The invisible scene has points filled with a colour corresponding to the ID, e.g. 0x000001, 0x000002, etc. When you select the points, it gets the distinct colours within the rectangle which is drawn, and those are the IDs which are selected. So if a point isn't visible, it won't be selected. To improve this, I could try making the points in the picking scene smaller so there's less chance of overlap, but it won't be perfect.

Ideally, the selection box would be translated to a shape in 3D space and then check if each point lies within that shape, but that would be quite a big task to implement.

[casperhart]

Try this:

remotes::install_github("casperhart/detourr@picking-improvements")

Using the example from #117, selecting points at basis one then moving to basis 2, this is before:

And this is after:

[casperhart]

fixed by #119