I need to pass an array of matrices to my shader, but it’s not currently possible because there is no setMatrices() on ShaderMaterial.
There is a setMatrices() on Effect, but mymat.getEffect().setMatrices(...) did not work because mymat.getEffect() returned null. So, I tried to call mymat.isReady() to make the internal _effect variable created, it still did not work, I think because the call must be done at the right time in the pipeline.
So, what about adding setMatrices() to ShaderMaterial? There are a number of others setXXX() methods that exist on Effect but not on ShaderMaterial (setIntArray/2/3/4, setFloatArray/2/3/4, setBool, etc).
I saw you added the setMatrices(), thanks for that!
However, would it be possible this method take a Matrice[] | Float32Array? I already have a Float32Array, so having to convert it to Matrice[] and having setMatrices() convert it back to Float32Array would make me sad 
Thanks in advance for what you can do.
Will try also to do this one!
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Feel free to start a PR and we will use it to discuss
Do not be worried about making mistakes
Was there a problem with this PR? I can see the changes are not part of the current preview release.
I will publish the nightly and it will be on preview 
Thanks.
In fact, I confused merging and publishing: I saw you merged several days ago, so though I should see the changes in in the releases afterward.
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