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  1. PO
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    <p>I've wanted to implement something like this and I choose a very different method - maybe much worse, I don't really know - but much easier to do IMO, so I put it here in case someone wants it.</p> <p>Basically, I used only 2 raycasts to know the first and last points of the selection rectangle, projected on my ground plane, and iterate over my objects to know which ones are in.</p> <p>Some very basic code:</p> <pre><code> function onDocumentMouseDown(event) { // usual Raycaster stuff ... // get the ground intersection var intersects = raycaster.intersectObject(ground); GlobalGroundSelection = { screen: { x: event.clientX, y: event.clientY }, ground: intersects[0].point }; } function onDocumentMouseUp(event) { // ends a ground selection if (GlobalGroundSelection) { // usual Raycaster stuff ... // get the ground intersection var intersects = raycaster.intersectObjects(ground); var selection = { begins: GlobalGroundSelection.ground, ends: intersects[0].point }; GlobalGroundSelection = null; selectCharactersInZone(selection.begins, selection.ends); } } function onDocumentMouseMove(event) { if (GlobalGroundSelection) { // in a selection, draw a rectangle var p1 = GlobalGroundSelection.screen, p2 = { x: event.clientX, y: event.clientY }; /* with these coordinates left: p1.x &gt; p2.x ? p2.x : p1.x, top: p1.y &gt; p2.y ? p2.y : p1.y, width: Math.abs(p1.x - p2.x), height: Math.abs(p1.y - p2.y) */ } } </code></pre> <p>Here is my select function:</p> <pre><code>function selectCharactersInZone (start, end) { var selected = _.filter( SELECTABLE_OBJECTS , function(object) { // warning: this ignore the Y elevation value var itsin = object.position.x &gt; start.x &amp;&amp; object.position.z &gt; start.z &amp;&amp; object.position.x &lt; end.x &amp;&amp; object.position.z &lt; end.z; return itsin; }); return selected; } </code></pre> <p>Some warnings: as far as I know, this technique is only usable when you don't care about Y positions AND your selection is a basic rectangle.</p> <p>My 2c</p>
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    1. POThreejs - How to pick all objects in area?
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    1. USvincent
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    1. COI wonder about the implementation of `selectCharactersInZone(begins, ends)`; are you iterating on ALL your object, and returning only those that found in the selected area?
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      1. USeldad87
    2. COI use this function to find the objects in the selected area so yes, I'm iterating on all **selectectable** objects - in my case a couple of characters - so it's fast enough. In my opinion, it's up to you to iterating over a decent amount of objects, and use a simple enough "find" test. I have edited the answer with my `selectCharactersInZone(begins, ends)` function.
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      1. USvincent
 

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