Mesh Screw Node #86901

New Issue

Hans Goudey · 2021-03-24T19:46:45+01:00

Hans Goudey commented

2021-03-24 19:46:45 +01:00

{F9908143 size=full}

This task is for a port of the "Screw" modifier to a node.

Details

All of the "Axis" and "Axis Object" controls from the screw modifier can simply be a "Direction" input, which can be further calculated with vector math nodes, etc.
There can be a single "Steps" parameter, since the "Viewport / Render" difference can be calculated outside of the node.
The merging can likely be handled afterwards with a separate node if necessary. This may be slightly less efficient, but I think the simplicity is worth it.
Smooth shading can be done with a separate node, so can flipping the normals.

Related Nodes

	Currently geometry nodes doesn't use the normals stored in `MVert`, but this node would probably be good to add eventually

Further Questions

Generalizing "Stretch UVs": The idea for geometry nodes is to use generic float2 layers for UVs, so this option would need to be generalized a bit to include in the node
Calculate Order: I've seen a few bug reports come in where the solution was just to turn this option on. Maybe it should just be turned on by default and not exposed in the node UI?

{[F9908143](https://archive.blender.org/developer/F9908143/image.png) size=full} This task is for a port of the "Screw" modifier to a node. **Details** * All of the "Axis" and "Axis Object" controls from the screw modifier can simply be a "Direction" input, which can be further calculated with vector math nodes, etc. * There can be a single "Steps" parameter, since the "Viewport / Render" difference can be calculated outside of the node. * The merging can likely be handled afterwards with a separate node if necessary. This may be slightly less efficient, but I think the simplicity is worth it. * Smooth shading can be done with a separate node, so can flipping the normals. **Related Nodes** | ![image.png](https://archive.blender.org/developer/F9908155/image.png) | Currently geometry nodes doesn't use the normals stored in `MVert`, but this node would probably be good to add eventually | | -- | -- | **Further Questions** * Generalizing "Stretch UVs": The idea for geometry nodes is to use generic `float2` layers for UVs, so this option would need to be generalized a bit to include in the node * Calculate Order: I've seen a few bug reports come in where the solution was just to turn this option on. Maybe it should just be turned on by default and not exposed in the node UI?

Hans Goudey commented

2021-03-24 19:46:45 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Hans Goudey commented

2021-03-24 19:46:45 +01:00

Added subscriber: @HooglyBoogly

Gregory commented

2021-03-24 20:10:21 +01:00

Added subscriber: @GregoryS

Hans Goudey commented

2021-03-24 20:17:10 +01:00

Added subscriber: @ideasman42

Hans Goudey commented

2022-06-04 11:28:25 +02:00

Changed status from 'Confirmed' to: 'Archived'

Hans Goudey closed this issue

2022-06-04 11:28:25 +02:00

Hans Goudey commented

2022-06-04 11:28:25 +02:00

Currently I'm not convinced that a high level node like this is required in geometry nodes. I think it's better if we provide the tools to build node groups that accomplish similar things. This is a win for performance (easier to optimize smaller amounts of lower level code), flexibility (more building blocks to piece together for different results), and the power of the system (ultimately, more will be possible because of the previous reasoning).

Iliya Katushenock commented

2022-06-04 11:42:31 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-06-04 11:42:31 +02:00

I made such a group of nodes.
It can be implemented both as an array and through profile curves and spirals.
So yes, I don't think there is much gain from a single node.

I made such a group of nodes. It can be implemented both as an array and through profile curves and spirals. So yes, I don't think there is much gain from a single node.

Stephan Kellermayr commented

2022-08-20 01:58:00 +02:00

Added subscriber: @Stephan-Kellermayr

Stephan Kellermayr commented

2022-08-20 01:58:00 +02:00

Just in case anyone is looking for it, here is an (almost) complete replica of the Screw Modifier based on Geometry Nodes: https://blender.stackexchange.com/a/272351/145249

Just in case anyone is looking for it, here is an (almost) complete replica of the Screw Modifier based on Geometry Nodes: https://blender.stackexchange.com/a/272351/145249 ![PgORP.png](https://archive.blender.org/developer/F13406749/PgORP.png)

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Mesh Screw Node #86901