Initial Sparse Array Edits Proposal

[gitamohr]

Description of Proposal

This proposal introduces a new value type, VtArrayEdit that can sparsely edit weaker VtArray opinions by inserting, erasing, and overwriting elements via a simple editing language, and a general framework for handling sparse attribute value opinions of any type in USD, including time-varying opinions in time samples and value clips.

Sparse Array-Editing Attribute Overrides in OpenUSD

Contributing

• I agree to and accept the Supplemental Terms.

[meshula]

I am wondering about a general resize operation (which I don't think I spotted). I'm thinking of a case like wanting to always successfully set the 3rd element of an array to some value. The proposal says that excess elements are ignored, and so I imagine that if the 3rd element is beyond the end of the array, my value is an excess element. So then, I notice that insert and remove change an array size, so I could imagine first doing three insertions at the end of the array in order to force that the array is at least three long, and now my write will succeed. Was something like resize minimum 3 already considered? That would be less problematic than my hypothetical work around.