Default values of `min_ijk` in `read_from_dense` and `read_into_dense` are different

[swahtz]

📋 Originally created by @fwilliams

Original author: @fwilliams
Date: 2024-12-13T20:59:55Z

---

(Original issue by Jiahui Huang in the old repo)

When converting dense pytorch tensor from/to VDB jagged tensor, we need the min_ijk argument, whose default values are different in read_from_dense and read_into_dense -- this would cause confusion to users. Specifically:

• In read_from_dense, its argument dense_origins is by default [0,0,0];
• In read_into_dense, its argument min_coord is by default 'null', which will be online computed as grid.ijk.min().

We need to align those default values (maybe also align the naming of the arguments)

Also remember to change fvnn.VDBTensor's to_dense and from_dense interface accordingly.

[fwilliams]

@blackencino I think you were looking at this most recently. Is it still relevant?