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Understanding Buffers Better.


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Ok, so I am trying to figure out how the heck to attach a custom attribute and had to simplify things a whole bunch to try to understand what is happening.
I am trying to attach a "offsets" attribute to each point and then in the vertex Shader manipulate the positions with the offsets.
http://www.babylonjs-playground.com/#1TDIAH#1 but as in this example it causes the shader to invalidate.

this is directly related to the post:

I just need to get a better understanding of some of this stuff before I move on.  Figured this stuff will be important for rendering dynamic procedural foliage fields.

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So when do I need to use the offset?

I was under the impression that I was like constructing a single Buffer with those elements and that I needed to include the offset when there was a prior one I added.
also What is the instanced flag for?  

this is stuff I kind of always ignored and I think its time to learn it all now.

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