Is it possible to incorporate a selection box along with the Raycaster in Three.js?

In my GLTF scene, I have been exploring the use of the example selection box (code) to select multiple meshes.

Unfortunately, the current approach is providing inaccurate results as it selects based on the centroid of each mesh and includes meshes that are not visible in the camera view (for example, selecting all walls when viewing one side of a house model).

I also tried using the Raycaster, which worked well for mouse/pointer picking.

Is there a way to combine a selection box or two Vector3 points (representing the starting and ending points of the box) with the Raycaster to achieve accurate selections?

javascriptthree.jsraycasting

Answer №1

To construct a Frustum using Three.js, you can utilize a Raycaster.

  1. Start by creating two Plane entities to represent the near and far planes of your camera.
  2. Then, employ the Raycaster to calculate where the start and end points of your selection area intersect with the previously created Plane objects.
  3. Next, use these intersection points to define the boundaries of the Frustum.
  4. Finally, leverage the methods Frustum.containsPoint and Frustum.intersectsObject to determine if a specific object falls within your selection area.

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