How to calculate how many screen pixels represent one world coordinate unit?

[hzqij]

In THREE.js:
How to calculate how many screen pixels represent one world coordinate unit?

[Fyrestar]

If it’s about perspective and depth then this function will help, otherwise you should provide more information.

Functions to calculate the visible width / height at a given z-depth from a perspective camera

These two functions will give you the visible height and width in your scene at a given distance from a PerspectiveCamera. It’s useful if you want to create an object that is the full width / height of the scene, or want to place objects at screen edges etc. Here’s the code (ES6): const visibleHeightAtZDepth = ( depth, camera ) => { // compensate for cameras not positioned at z=0 const cameraOffset = camera.position.z; if ( depth < cameraOffset ) depth -= cameraOffset; else depth += c…

[hzqij]

For example, I have a unit cube. When there is no scaling, I want to get one coordinate unit represented by how many screen pixels.

When I zoom in, then this one coordinate unit is represented by how many screen pixels.

thanks.