Unable to add hotspots on point cloud model

[virtualheritage]

I would like to add some annotations on a point cloud model, but it seems that click event doesn't get triggered on this type of models. I have tried in modelviewer editor, but no success.

Validation report shows that this model has 0 triangles, so I guess there is no surface where you can click thus click event doesn't get triggered.

Any workaround or idea to allow click events being triggered when clicking vertices?

[elalish]

I'm not sure. I would recommend falling back to setting data-position to world-coordinate values by hand.

[virtualheritage]

Thanks for your answer, but sadly our use-case requires non-programmer users being able to add hotspots, so that solution wouldn't be suitable for us.

[elalish]

Well, it is possible in three.js: https://threejs.org/examples/#webgl_interactive_raycasting_points and it looks like a bug in our positionAndNormalFromPoint() method that's discarding them. Would you mind linking a point-cloud GLB for me to test with? It still won't work in our editor since that uses surfaceFromPoint() now, but it should be pretty easy to set up your own hotspot-adding page.

[virtualheritage]

Of course: removed link

[elalish]

Okay, I've got this fixed over in #4228. I tested that it works on your model, though it often picks points that don't seem right. My best guess is that model has points that are colored transparent (alpha < 1). I'd recommend removing those points, or changing their colors.

[virtualheritage]

Thanks!