Adjust for browser zoom within Three.js CSSRenderer

I'm currently developing a project in three.js using the CSSRenderer and the challenge I'm facing is ensuring that it displays correctly even when the browser zoom is not set at 100%. So far, it appears that:

I thought about possibly detecting the zoom level and applying a CSS zoom in the opposite direction to compensate, similar to what was suggested in Vijey's post found here: Changing the browser zoom level

Given this, it seems challenging to properly display the three.js scene when the browser zoom is anything other than 100%. I even struggled to display a warning message to users advising them that the application may not function correctly at different zoom levels in the browser. Can anybody offer a solution to this issue? Is there ongoing work to address this problem?

javascriptcss3dthree.js

Answer №1

When working with Three.js, transformations are typically applied using the matrix3d() function. However, there is a well-documented issue in Chrome where 3d transformations utilizing matrix3D may not scale correctly when the browser zoom is adjusted.

An illustration of this bug can be viewed here. If you play around with the zoom level, you'll observe the boundary between the red and blue boxes shifting.

To circumvent this Chrome bug, it is recommended to apply transformations such as rotate, translate, and scale independently. By following this approach, the scaling behaves as intended, as evidenced here (consistent boundary between boxes across zoom levels).

An enhanced version of the CSSRenderer has been shared that implements this strategy and ensures correct scaling.

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