GPU particles disappeared with BILLBOARDMODE_STRETCHED

Bugs
1

PG: https://playground.babylonjs.com/#0K3AQ2#2479
I noticed BILLBOARDMODE_STRETCHED is valid for GPUParticleSystem, but I failed to find any particle after setting this.

2

I can’t tell the difference between BILLBOARDMODE_ALLPreformatted textand BBILLBOARDMODE_STRETCHED Preformatted text(tested with a generic particle system)
What should the expected BILLBOARDMODE_STRETCHED Preformatted textlook like?

3

This playground can see the difference: https://playground.babylonjs.com/#0K3AQ2#2481
Texture in the first playground will look the same after rotate.

4

I’ve checked the difference and the internal buffer

renderVertexBuffers[“direction”] = renderBuffer.createVertexBuffer(“direction”, offset, 3, this._attributesStrideSize, true);

not working seems to be the problem.

5
6

This PR will fix the problem:

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