Flesh out Blueprint protocol documentation for mixed-vars / material-dependent fields
@JustinPrivitera is already working on this.
Since May 8, 2026.
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Description
The documentation for making mixed-variables and material-dependent fields is very sparse. It would be helpful to have examples of these things, similar to what was done for the various matset flavors.
* The docs indicate that vertex-associated material fields are possible - what would that look like??
* Can we store vectors in mixed representations? What does it look like?
```
fields:
unibuffer:
topology: main
matset: mat
values:
x: []
y: []
matset_values:
x:[]
y:[]
```
```
fields:
multibuffer:
topology: main
matset: mat
matset_values:
A:
x:[]
y:[]
B:
x: []
y: []
```
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