Sort Elements Node #109983

New Issue

Hans Goudey · 2023-07-11T21:08:18+02:00

Hans Goudey commented

2023-07-11 21:08:18 +02:00

Inputs

Domain All domains except for "corner" are supported
Selection Only selected elements are affected
Group ID Elements with the same group ID are sorted together (though there may be gaps of unselected elements), without considering outside elements. In the final geometry, the elements in each group are moved together, ordered by the value of the ID.
Sort Weight The sorted values used to do the reordering. If this and the group ID are single values, the node does nothing

Behavior

Sorting some domains implicitly reorders or changes other domains too. Reordering faces and curves will reorder their points. Reordering vertices will remap corner vertices and edge vertex indices. Reordering edges will remap corner edges.

Like other nodes, attributes need to be interpolated, so all attribute data is reordered, not just the topology attributes.

Performance Notes

When reordering faces or curves, if every face/curve has the same size, their offsets won't be affected, so they shouldn't be changed.

Background

Normally the order of elements in a geometry doesn't matter, but sometimes it does, and it's nice to have control in those situations. For example, edit mode already has the operators in the screenshot below. With fields, these can be better generalized.

![image](/attachments/c7424027-2d23-4c24-b8ef-f48498a75864) ## Inputs - **Domain** All domains except for "corner" are supported - **Selection** Only selected elements are affected - **Group ID** Elements with the same group ID are sorted together (though there may be gaps of unselected elements), without considering outside elements. In the final geometry, the elements in each group are moved together, ordered by the value of the ID. - **Sort Weight** The sorted values used to do the reordering. If this and the group ID are single values, the node does nothing ## Behavior Sorting some domains implicitly reorders or changes other domains too. Reordering faces and curves will reorder their points. Reordering vertices will remap corner vertices and edge vertex indices. Reordering edges will remap corner edges. Like other nodes, attributes need to be interpolated, so all attribute data is reordered, not just the topology attributes. #### Performance Notes - When reordering faces or curves, if every face/curve has the same size, their offsets won't be affected, so they shouldn't be changed. ## Background Normally the order of elements in a geometry doesn't matter, but sometimes it does, and it's nice to have control in those situations. For example, edit mode already has the operators in the screenshot below. With fields, these can be better generalized. ![image](/attachments/3d115cf0-ff36-4dc9-bd6b-e69594857965)

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