Add an EventListener to a blender object

Tagged: blender, eventlistener, object

This topic has 2 replies, 2 voices, and was last updated 3 years, 1 month ago by elie520.

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2021-03-17 at 10:16 pm #39541

elie520
Participant

Hello,
I have a blender project from which I created a verge3d project. I used a bit of puzzle, but I would now like to directly use some JavaScript because it’s easier for me to organize my code.
I’m at a point where I would simply like to add an eventlistener to detect a click on an object.

I start by getting my hand on the desired object with let my_obj = app.scene.getObjectByName('myObjectName'). Then I naively tried my_obj.addEventListener('click', function(){console.log('my_obj was clicked!')}), but it won’t work, since I don’t think my_obj has that method. But is there a way to achieve what I want? Thank you!

2021-03-17 at 10:42 pm #39542

GLiFTeK
Customer

I believe you’d have to use raycasting for this.

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2021-03-18 at 11:55 pm #39574
elie520
Participant
This is PERFECT thanks a lot!!

For future reference, here’s a working example:
```
function clickedBlenderObject(event) { // returns the clicked object if any, null otherwise
        let mouse = new v3d.Vector2();
        mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
        mouse.y = - (event.clientY / window.innerHeight) * 2 + 1;
        let raycaster = new v3d.Raycaster()
        raycaster.setFromCamera(mouse, app.camera);
        let intersected = raycaster.intersectObjects(app.scene.children)
        return intersected.length?intersected[0].object:null
    }

function myFunction(event) {
        let clicked_object = clickedBlenderObject(event)
        if (clicked_object) {
            //do whatever you want with your clicked_object and the event
        }
    }

window.addEventListener('click', myFunction);
```
Of course, much more can be done since the raycasting encapsulates much more infos.

Once more, thank you GlifTek :)
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