For todays post on three.js I thought I would write a quick bit on arrow helpers. In three.js there are a number of built in helper methods than can be used to quickly create structures that helper to visualize what is going on with orientation of objects. The THREE.ArrowHelper constructor is one such helper that can be used for visualizing directions in three.js.
In this post I am using revision 98 of three.js, which was released in late October 2018. Three.js is still a project that is being developed, and at a fairly fast rate with new revisions continuing out what seems like every month.
So a basic example of an Arrow helper would involve setting a direction, origin, length, and color by passing those values to the THREE.ArrowHelper constructor in that order. The direction and origin should be insistences of THREE.Vector3. The length should be a number value consistent with the desired length relative to the other values of the camera and objects in the scene, and the color should be a hex value.
It might also be of interest in how to go about changing direction of the arrow helper when working out an animation of some kind or anything to that effect. For this there is the setDirection method of the arrow helper instance.
Thats are there is to it when it comes to arrow helpers in three.js for now. if you enjoyed this post you might want to check out my many other posts on three.js. In any case thank you for reading.