Error encountered while importing animation from 3ds Max to Collada format and then to Three.js: "Scaling exceeds limits"

After exporting a rigged and animated model to collada using the opencollada exporter from 3ds max, everything seems to load fine and the animation runs smoothly. However, with each loop of the animation, I encounter the following warning:

THREE.Animation.update: Warning! Scale out of bound ...

This warning displays as:

THREE.Animation.update: Warning! Scale out of bounds:-0.002944999956526251 on bone 0

To see this issue in action, simply open the console on the page where I've hosted it. The source code can also be found in a github repo:

The issue arises from this specific line in the three.js source code:

scale = ( currentTime - prevKey.time ) / ( nextKey.time - prevKey.time );

During the last frame of the animation, nextKey corresponds to the first frame with a time of 0, while prevKey refers to the last frame with a time of 0.66666 in my case. As a result, the calculation 0 - 0.6666 leads to a negative number, causing the calculated "scale" to be out of bounds.

Could this be a bug within three.js, an issue with how I exported my models, or something else entirely? It seems unlikely that this behavior would be appropriate for looped keys.

javascriptthree.jscollada

Answer №1

This bug in threejs is a real issue that has been observed in one of the code examples. You can view the details of the bug here.

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