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Error if skeleton is out of view when scene starts


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In a blender scene one of the character meshes has an armature with an animation.

After exporting to a .babylon file and loading it, if the character with the skeleton armature is visible when the scene starts , the animation plays and the scene works as normal,

If the camera is facing away from the animated character when the scene starts this error occurs



Uncaught TypeError: Failed to execute 'uniformMatrix4fv' on 'WebGLRenderingContext' : No function was found that matched the signature provided.

(using nw.js based on Chromium 41.0.2272.76.)


This is how the scene is loaded

BABYLON.SceneLoader.Load("", "TheBlenderScene.babylon", engine, function (newScene) {        newScene.executeWhenReady(function () {

It's happened in 3 projects, my current workaround has been to include all the animated meshes in the view when the game starts.

Has any one else has had this problem, or have an idea of how to avoid the error? thanks

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Yep here's two test scenes that reproduce the error.
Although I found it only happens when "Variance" shadows are enabled (from blender), otherwise it works,
so it looks like varience shadows are causing the error
Here's a scene with two animated object in view: 
And here's the identical scene with the camera facing away from the animated objects
This is what the blender setup looks like
Here's a zip with all the files (including the blender file)
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The skeleton's transformation matrix is not calculated, since prepare is (probably) called only when a camera is targeting the object.

Adding a

this.prepare();//make sure it will recalculate the matrix next time prepare is called.this._isDirty = true; 

at the end of the Skeleton's constructor solved the issue.

@DK - Pull Request follows in a sec. The isDirty = true is actually optional, it works well without it. It is there just to make sure it works as before, just with matrix initialization.

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  • 1 year later...

This seems to be broken (again?) - i am using the 2.5 beta from github (downloaded yesterday).

And I get exactly this problem right on startup:

(I do have a character with a skeleton in the scene and I have a shadowGenerator active on this character. But the character get's moved into view.)


Uncaught TypeError: Failed to execute 'uniformMatrix4fv' on 'WebGLRenderingContext': No function was found that matched the signature provided.
  (anonymous function)    

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Calling this.character.skeleton.prepare() explicitly fixed the problem for me - so thank you very much for this thread and the solution @RaananW !



Since the fix was the same, this bug really seems to be reintroduced (or the pull request wasn't merged - I have not checked into that.)

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Playground that reproduce error and the fixes described in this thread:

(To see the error the browser console has to be opened before pressing run, I am using the latest chrome)





The only change: Not rotating the Camera by Math.Pi on Y-Axis. (Which brings the animated mesh back into view of the camera).

No-Error 2:


This time camera is still rotated (mesh out of view) but .prepare() is called on the skeleton, this also fixes the error.

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Thank you David, really appreciate it!

Trying to get to know babylon good enough, so I can use it next weekend for a ludum dare submission.

(And this is by no means a breaking bug - but if I hadn't found this thread I would have been pretty confused what causes it.)

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