Loading JSON models with raycasting and colliding with meshes in three.js

Currently, I am utilizing a raycaster to detect if the mouse (or touch) hits a mesh. The object is slender and I would like to enlarge the size of whatever can be intersected by the Ray. While working with game objects in three.js, is there a way for me to insert my own collision mesh that does not render but still activates the Ray?

https://i.sstatic.net/Aad1V.jpg

For instance, when the ray collides with an (invisible) pink cylinder linked to the original mesh, it triggers the intersection.

Simply creating another mesh grouped with the original one and setting visibility to false or opacity to 0 does not produce the desired result. I am searching for a more integrated solution, if available.

Thank you in advance!

javascriptthree.jscollisionintersectionraycasting

Answer №1

If you need a collision mesh in your scene that can be detected by raycasting but doesn't need to be visible, follow these steps:

Add the collision mesh as a child of another mesh in your scene. Then, make sure to set the visibility of the collision mesh's material to false using the following code snippet:

collisionMeshMaterial = new THREE.MeshBasicMaterial( {
    visible: false
} );

By doing this, the collision mesh will be responsive to raycasting without being rendered on the screen.

This solution is applicable for three.js version r.74.

Answer №2

One way to handle clickable meshes is by maintaining a separate collection of them instead of adding them directly to the scene.

To check for intersection, you can simply use: 

raycaster.intersectObjects(collection);

It's important to ensure that these meshes are synchronized with their parent object at all times.

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