Determine the vertices of the near and far planes by utilizing the THREE.Frustum method

Seeking assistance with the THREE.Frustum object.

The Issue:

I am trying to calculate near and far plane vertices, referencing these tutorials:

  1. Tutorial 1
  2. Tutorial 2

I have implemented a function based on the explained procedure for obtaining top-left/right vertices considering the camera's horizontal field of view:

// Code snippet here

While this implementation seems to be functioning...

The Query:

Is there a more elegant or perhaps more accurate method to achieve the same outcome using a THREE.Frustum object?

javascriptopengl-eswebglthree.js

Answer №1

The Frustum of Three may not be the most helpful tool—it simply consists of planes. However, it seems like your solution is on the right track, although there is a simpler way to approach this problem.

You can find the coordinates for the upper right corner of the near plane in camera space using these values:

var ntr = new THREE.Vector3( wNear / 2, hNear / 2, -camera.near );

Your definitions for wNear and hNear are correct.

Ensure that camera.matrixWorld is up-to-date, then convert that point to world coordinates with the following code:

camera.updateMatrixWorld();
ntr.applyMatrix4( camera.matrixWorld );

Change the signs to determine the remaining three corners, and repeat the process for the far plane.

You were on the right path; you just took a more complex route. :-)

UPDATE: now compatible with three.js r.66

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