Why doesn't the raycaster recognize wireframe-objects?

Questions
1

When I click on the edge of the green wireframe (red circle) nothing happens…

grafik

var intersects = raycaster.intersectObjects(targetListMouse);

            if (intersects.length > 0) {
                console.log("intersects[0]", intersects[0])
    }

this is how I create the wireframe

let geoWireframe ;
let wireframe ;
let Linegeometry = new THREE.Geometry();
Linegeometry.vertices.push(tempGeo.vertices[edge[1]], tempGeo.vertices[edge[0]],tempGeo.vertices[edge[1]]);
Linegeometry.faces.push(new THREE.Face3(0,1,2));
geoWireframe = new WireframeGeometry2( Linegeometry );
wireframe = new Wireframe( geoWireframe, matLineEdges );
wireframe.computeLineDistances();
wireframe.visible = true;
scene.add( wireframe );
targetListMouse.push(wireframe) // used by the raycaster
2

Is there any support for raycasting fat lines?

3

Related? https://github.com/mrdoob/three.js/pull/17160

2 Likes
4

Unfortunately not. But it seems @gkjohnson is planning to work on this in the near future: Line2 Example: Remove copy function overrides by gkjohnson · Pull Request #17798 · mrdoob/three.js · GitHub

2 Likes
5

Is there any working raycast-support for normal ( / any) lines?

When I use this line https://threejs.org/docs/#api/en/objects/Line near my mesh, the raycaster treats every click on my mesh as a click on the lines…

6

Would it be an option to create a fake wireframe by forwarding an extra per-vertex vector attribute that defines a local coordinate system on each face, and use this in a shader for drawing the lines? Or perhaps a much simpler solution would be to raycast on the mesh and just filter the results by local coordinates (or even texture coordinates). :wink:

7

https://threejs.org/examples/webgl_interactive_lines

This example seems to work fine.

This could be a problem in your code. If the raycast returns multiple intersections, you have to evaluate the result and ensure only to pick the relevant one for your use case.

1 Like
8

But it seems @gkjohnson is planning to work on this in the near future

I am! It may be a couple weeks before I can get a PR in but in the mean time I’ve been using the interactive lines example approach (as you suggested in another comment) for raycasting while rendering with fat lines. It’s not perfect but it does the job for thin lines.

2 Likes