Geometry Node: Edge Rings node #104623
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Jacques Lucke
Hans Goudey
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Reference: blender/blender#104623
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Delete Branch "mod_moder/blender:edge_rings"
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Geometry node analog of edit mode edge rings selections operator.
I think this is a really nice idea, and I like the possibilities it brings. However, like the last comment on Phabricator mentioned, in order to be a compelling PR, it really should have more use-case oriented examples of how this can be used in real-world procedural modeling tasks. The examples currently in the description make sense, but beyond being interesting, they don't make a strong case for why the node should be included.
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A couple of use cases I can think of:
Just for indexing of edges in chain propose i did some speedups of Shortest Edge Path nodes. As i can see, only way to make this in general is to use path finder algorithm.
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I think this node could be useful in a scenarios where the base geometry is generated with GN and there is a need for specific selection without going out of the procedural workflow. Same goes for storing attributes base on that selection.
Examples:
Making random selection that goes in specific direction and wraps around the model. If the base mesh is skewed or rotated
Edge Ringsnode could be useful in selecting such edges.Selecting specific parts of the mesh after joining multiple meshes together. For example after using
Mesh Booleannode, but same could go after any remesh operation.Same as nr 2. but after
Volume to MeshorGrid to MeshSelecting specific segments of an extruded curve along its tangent. Could be useful for ropes.
Selecting segments of pseudo-parametric surfaces made with GN and Curve Objects. Note that the extruded curves are not the same ones that are used for generating surface geometry.
Selecting layered parts of the geometry that is not aligned with X/Y/Z axis (similar to example nr 1). Could be useful for masking and selecting parts of procedurally generated cliffs.
I think that this node can be very useful in nodetools too, but I haven't tested it in that context.
I have to say, just watching the screenshots, they mostly seem too abstract to be applaudable.
I don't think a function is really desired if you leave others behind. I mean those architectural artists, environmental artists, FX artists, mograph, stylized arts, etc.
I only see 6th example to be a little interesting, which reminds me river generation.
but I don't think 6th example has to live with edge ring node.
there can potentially be other more general approaches that doesn't restrict themselves on topology, but more freely variable with random seeds.
Here I am not saying edge ring node isn't good.
I just don't think the provided use-cases promote anything.
Would love to see this implemented!
I've definitely had a couple of occasions over the past year where I wanted this node to exist. It seems like a pretty basic form of selection that should be available in procedural modelling, without there being any need to find specific examples to justify it's existence.
There will always be numerous use cases that are hard to anticipate or provide as some sort of generic examples, as every user will have their own specific needs, especially when it comes to a building block node like this.
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