![]() Once I have a non zero length for the vector I can then use the multiply scalar method to multiply that length by any desired value that I give as the first argument when calling the multiply scalar method.Lowp vec4 color // for colors, lowp is usually fine mediump vec4 position // for positions and texture coordinates, mediump is usually ok highp vec4 astronomical_position // for some positions and time, highp is necessary //(precision of time measurement decreases over time //and things get jumpy if they rely on absolute time since start of the application) 1 - Basic Vector3 multiply scalar exampleįor a basic example of this multiply scalar method there is starting out with just using the typical set method to set an initial length for the vector that is greater than 0. This is also where I am packing the source code examples for my many oter posts on threejs. I have the source code examples in this post up on my test threejs Github Repository. The source code examples in this post are also on Github Code breaking changes are made to threejs often so check your version numbers first and for most if any of these code examples are breaking on versions of threejs later than r140. The version of threejs that I was using when I first wrote this post was r135, and the last time I came around to do some editing I was using r140. I will be touching base on a lot of these methods in this post but it would be best to look into Vector3 as a whole in greater detail. There are many other useful methods in the Vector3 class that can be used together in a chain such as the add method that can be used to translate from a given vector with another vector. Every point that lays on this ray going outward has the same direction, but the length is what will be different. In other words think in terms of a ray starting at an origin and then moving outward into space from there. From there a method like that of multiply scalar can be used to easily set any desired vector unit length. What this method does is it sets the unit length of a vector to that of one while preserving the direction of the vector. I have wrote a post on the normalize method of the Vector3 class a while back also which is something that is worth looking into more if you have not done so. Look into what else there is to work worth in the Vector3 class There are many a few other topics beyond the basic of threejs that you should also be aware of at this point, so in this section I will be quickly going over some of them. This is not a getting started type post with threejs, and I also assume that you have at least a little experience with client side javaScript in general also. This is a post on using the multiply scalar method of the Vector3 class in the javaScript library known as threejs. The multiply scalar methods of the Vector3 class and what to know first So then in this post I will be going over example of the multiply scalar method, but also many other Vector3 class features and various features of threejs in general as always. I often use this multiply scalar method in combination with other Vector3 methods such as the normalized method that will set the unit length of the vector to that of one, which would be a good starting point before using a method like the multiply scalar method. In other words it is a way to change the position of the vector, but only along a ray that comes out from an origin that is found by way of the current values of the Vector. The multiply scalar method is a way to adjust the unit length of the vector without chaining anything with the direction of the vector. ![]() ![]() However there are also a number of other useful methods in this class including methods like the multiply scalar method which will be the main focal point of this post today. ![]() There are the very basics with this class when it comes to starting out with the set, and copy methods for example. One major part of doing anything interesting with threejs is learning how to go about positioning things when it comes to working with the Vector3 class in the library. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |