Hii, I want to create a line of 1 cm in THREE.Scene.I make a line by passing vertices value of {0,0,0} to {1,0,0} which makes straight horizontal line,But I have a doubt is it a 1 mm or 1 cm line ?? or is it measure in Pixel. Thanks & Regards Gaurav

This question was already answered multiple times by Ben Houston at stackoverflow: [Premkumar Jayaseelan] threejs: How the Unit of Measure of represent for position? three.js asked by Premkumar Jayaseelan on 05:48PM - 29 Apr 15 UTC …

Notice that when you resize a Three.js application, the height of the viewport affect object sizing, so there isn’t really an absolute size for everything. I’m thinking of how to introduce absolute sizing to Three.js. For starters, figuring this out will begin to help understand how to do that. Ulti…

Have you got the absolute sizing/mapping figured out?

For anybody coming across this post, the “official” answer is that three.js uses SI units, meaning that 1 unit = 1 metre. Even though this is abstract, it’ a good idea to stick to this as much as possible since it will make working with other applications easier.

[image] June_Wang: Have you got the absolute sizing/mapping figured out? Yes I have, for example if you try the following demo and resize the window, you’ll see the “buttons” stay the same size regardless of window size (the shadow and light is rendered with Three.js): That example however…

What do you mean it’s abstract? If 1 unit = 1 meter, then 1 unit is indeed 1 meter, no?

Abstract in the sense that 1 unit equals 1 metre just because we decided to follow the convention of SI units. I guess saying that it’s ‘by convention’, rather than ‘abstract’, makes more sense.

So if 1 unit = 1 meter, 0.001 unit = 0.001m, how precise can it get?

That depends on your scene, graphics card, and the values of the near and far clipping plane. If you need to make really tiny scenes, then it’s OK to break this convention - just switch to using 1 unit = 1μm. Or, if you need to go from very tiny to very huge then use a logarithmic depth buffer inst…

Units in Three.js

Questions

trusktr January 15, 2019, 10:40pm 16

@June_Wang For more details on how I originally came up with it, see [SOLVED] How do we size something using screen pixels.

Topic		Replies	Views
What unit of distance in threejs? Questions transform	12	13163	June 1, 2021
Three.js native units scaled to other units? Questions	2	677	January 26, 2022
Feature idea: world scale, or unit scale Discussion physical-material , scale , light	7	1964	June 2, 2023
Blender Object to ThreeJS (dimensions) Questions	6	2575	June 11, 2019
Orthographic Frustum Size Calculation Questions camera-controls , camera , animation , orthographic-camera , arcball-controls	17	274	May 14, 2025

Units in Three.js

Related topics