This is also where I park the source code examples for the many other blog posts that I have wrote on threejs as well. I also have the source code examples that I am writing about up on Github in my test threejs repository. The Mesh if what should often be what is used to set orientation first and foremost, it is just that there are some situations in which the orientation of a geometry will need to be adjusted too at least once. A geometry is often used with a Mesh, and a mesh is based off of the Object3d class. There is rotating a geometry and then there is rotating something that contains that geometry. It should go without saying why the Euler class is important when it comes to rotating a geometry, but the vector3 class is also of interest when it comes to using something like the look at method as a way to set the orientation of a geometry or a mesh object as the value passed to such a method when using just one argument needs to be an instance of vector3. The vecor3 class is a position so the values are x y, and z cornets, while with Euler there is a similar set of values but the values used are radian values that represent angles rather than a position. The two classes are somewhat similar in terms of properties and methods but the values that are used with them are very different. A Vector3 class instance is used to represent a position in space, and a Euler class instance is used to represent an orientation of an object in space. If are not familial with the Vector3 and Euler classes now would be a good time to look into these and have at least some basic understanding of what they are used for. Read up more on Vector3 and the Euler classes However I will take a moment to cover some basics in this section that you should take a moment to get solid with before continuing reading this post of you have not done so all ready. The content of this post is then on a topic that might be a little advanced for people that are still relatively new to threejs and javaScript in general. This is a post on using methods of a buffer geometry instance to rotate just a geometry independent of any orientation of a mesh object that might use this geometry. Buffer geometry rotation and what to know first In this post I will be going over a few examples that will showcase this sort of thing. However I think it might be best to use these methods only once to make the geometry line up with what would be expected when using an object3d level method or property value to set an orientation of a mesh object that contains a geometry. Often I end up using a method like that of the rotateX method however just like that of the Object3d class there is also a look at method that might also work in some cases. When it comes to rotating a buffer geometry there are a number of methods that are of interest for this kind of task.
In some cases I might want to rotate a geometry rather than rotating the mesh object, or any parent object of the mesh. However it is also worth pointing out that the buffer geometry used in a mesh object can also be rotated independently of a mesh objects orientation as well. When it comes to a Mesh object which is one of many objects that are based off of object3d, this rotation property can be used as a way to rotate the mesh as a whole, along with any children that might be added to the mesh objects as well. When it comes to rotating things in threejs there is the rotation property of the object3d class that stores an instance of the Euler class which is one way to adjust the local rotaton of such an object.
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