Details

Reviewers

Jacques Lucke (JacquesLucke)

Maniphest Tasks

T86391: Mesh Primitive Nodes

Commits

rB9a56a3865c06: Geometry Nodes: Add initial version of mesh primitives

Summary

This patch includes nodes to build the following primitives:

In general the inputs are the same as the corresponding operators in the 3D view.

For the line primitive there are two options-- adding vertices between two end points,
or adding vertices each at an offset from the start point. For the former mode, there
is a choice between a vertex count and a distance between each point.

For the plane/grid primitive I combined the two into one node. Here's the thinking:
Generally primitives are named after the simpler form of the shape they create
(i.e. "Cone" can make some more complex shapes). Also, generally you want to tweak
the number of subdivisions anyway, so defaulting to plane is not an inconvenience.
And generally having fewer redundant base primitives is better.

Diff Detail

Repository

rB Blender

Branch

geometry-nodes-mesh-primitives

Build Status

Buildable 13487
Build 13487: arc lint + arc unit

Event Timeline

Hans Goudey (HooglyBoogly) requested review of this revision.Mar 13 2021, 11:47 PM

Hans Goudey (HooglyBoogly) created this revision.

Harbormaster completed remote builds in B13486: Diff 35148.Mar 13 2021, 11:47 PM

Bartosz Moniewski (monio) awarded a token.Mar 13 2021, 11:55 PM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)Mar 13 2021, 11:58 PM

Hans Goudey (HooglyBoogly) added a project: Geometry Nodes.

Adam Friesen (ace_dragon) awarded a token.Mar 14 2021, 12:01 AM

Erindale (Erindale) awarded a token.Mar 14 2021, 2:32 AM

Erindale (Erindale) added a subscriber: Erindale (Erindale).

Hans Goudey (HooglyBoogly) added a task: T86391: Mesh Primitive Nodes.Mar 14 2021, 3:36 AM

Kenzie (kenziemac130) awarded a token.Mar 14 2021, 4:15 AM

Nice work!!! I like how the cone is able to handle varying base and top sizes which is far more useful than the existing add cone operator.

On the cylinder it says "vertices" which is a little bit misleading considering there are twice as many vertices actually produced. Also in practice a cylinder often needs the long strips of faces to be divided with edge loops in order to be useful for subdiv and displacement. Maybe the cylinder primitive could be made similarly to the UV sphere and have "segments" and "rings" as well?

In D10715#271375, @Kenzie (kenziemac130) wrote:

Nice work!!! I like how the cone is able to handle varying base and top sizes which is far more useful than the existing add cone operator.

On the cylinder it says "vertices" which is a little bit misleading considering there are twice as many vertices actually produced. Also in practice a cylinder often needs the long strips of faces to be divided with edge loops in order to be useful for subdiv and displacement. Maybe the cylinder primitive could be made similarly to the UV sphere and have "segments" and "rings" as well?

I believe on a cylinder verts should be called meridians and horizontal cuts should be parallels

Cleanup: Remove unused includes, change switch to if
Add line primitive node

Harbormaster completed remote builds in B13487: Diff 35153.Mar 14 2021, 5:47 AM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)Mar 14 2021, 5:49 AM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)Mar 14 2021, 5:52 AM

In D10715#271375, @Kenzie (kenziemac130) wrote:

Nice work!!! I like how the cone is able to handle varying base and top sizes which is far more useful than the existing add cone operator.

On the cylinder it says "vertices" which is a little bit misleading considering there are twice as many vertices actually produced. Also in practice a cylinder often needs the long strips of faces to be divided with edge loops in order to be useful for subdiv and displacement. Maybe the cylinder primitive could be made similarly to the UV sphere and have "segments" and "rings" as well?

That gives me an idea-- the topology of the UV sphere and a cylinder / cone with rings would be very similar. I wonder if I could share the topology generation between the UV sphere, the cone, and the cylinder. Interesting! I'll have to think about that when I'm more awake.

Fran Marz (franMarz) awarded a token.Mar 14 2021, 10:00 AM

Some User (someuser) awarded a token.Mar 14 2021, 1:13 PM

Remove extra assert
Add plane primitive node
Remove unecessary checks for zero

Harbormaster completed remote builds in B13504: Diff 35179.Mar 15 2021, 3:16 AM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)Mar 15 2021, 3:26 AM

kursad k (kursadk) awarded a token.Mar 15 2021, 4:58 AM

Kenzie (kenziemac130) added a comment.Mar 15 2021, 9:20 AM

This comment was removed by Kenzie (kenziemac130).

Deen (Bit) awarded a token.Mar 15 2021, 1:53 PM

Use "Location" consistently
Add UVs to sphere primitive
Add UV attribute creation to cone node
Add UVs to plane primitive

The "UVs" added are a generic float2 attribute named uv.

Harbormaster completed remote builds in B13524: Diff 35227.Mar 15 2021, 10:59 PM

Fix off-by-one error in the line node

Harbormaster completed remote builds in B13525: Diff 35228.Mar 15 2021, 11:15 PM

Use BMesh for cone, cylinder, and sphere

This version will be up to 2000 times slower in some cases (the BMesh version of a high resolution sphere takes 40 seconds while
the version I had implemented before takes about 20ms). However, this will provide a simpler initial patch to simplify review for Bcon2.
I will post the speedups as a separate patch.

Harbormaster completed remote builds in B13526: Diff 35229.Mar 15 2021, 11:19 PM

Hans Goudey (HooglyBoogly) retitled this revision from Geometry Nodes: Add initial mesh primitives to Geometry Nodes: Add initial mesh version of primitives.Mar 15 2021, 11:19 PM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)

Hans Goudey (HooglyBoogly) added a reviewer: Jacques Lucke (JacquesLucke).

Hans Goudey (HooglyBoogly) retitled this revision from Geometry Nodes: Add initial mesh version of primitives to Geometry Nodes: Add initial version of mesh primitives.Mar 15 2021, 11:22 PM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)

Hans Goudey (HooglyBoogly) added a child revision: D10730: Geometry Nodes: Greatly improve speed of some mesh primitives.Mar 16 2021, 1:03 AM

Hans Goudey (HooglyBoogly) mentioned this in D9964: Geometry Nodes: Plane Primitive Node.Mar 16 2021, 4:35 AM

Hans Goudey (HooglyBoogly) mentioned this in D10190: Geometry Nodes: Point Primitive Node.Mar 16 2021, 4:38 AM

Just FYI this was brought to my attention as something related to that: D10093

Jacques Lucke (JacquesLucke) added inline comments.Mar 16 2021, 1:14 PM

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cone.cc
231	`nullptr`
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cube.cc
57	`nullptr`
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_ico_sphere.cc
62	`nullptr`
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_uv_sphere.cc
96	`nullptr`

On the UV Sphere, when Rings or Segments are less than 3 it returns no Geometry. I suppose this is partly a UI issue but would it be better to clamp using min(x, 3)?

I'm not done with the review yet.

I think returning no geometry in the case when the number of vertices is too low is better. One can always add a clamp node before, but the opposite would not be easily possible.

source/blender/nodes/CMakeLists.txt
170	sort alphabetically
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_circle.cc
125	Can be shortened to MutableSpan<MVert> verts{mesh->mvert, mesh->totvert}; MutableSpan<MLoop> loops{mesh->mloop, mesh->totloop}; MutableSpan<MEdge> edges{mesh->medge, mesh->totedge}; MutableSpan<MPoly> polys{mesh->mpoly, mesh->totpoly}; One could even remove the `MVert` part, but I think it help readability here.
141	`const`

Charlie Jolly (charlie) awarded a token.Mar 16 2021, 1:50 PM

Jacques Lucke (JacquesLucke) added inline comments.Mar 16 2021, 1:58 PM

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cone.cc
69	`use_top` does not make much sense to me. A better name might be `top_is_single_point`.
216	Compare with enum values instead of magic numbers.
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_ico_sphere.cc
54	The ico-sphere node generates wrong geometry when the radius is negative.
72	`8` is a bit low imo. The hardmax in `MESH_OT_primitive_ico_sphere_add` is `10`.

Merge branch 'master' into geometry-nodes-mesh-primitives-slow
Simplify span constructors, use nullptr
Sort alphabetically, use const
Rename variables
Don't set fourth component of SOCK_VECTOR to 1.0f

Harbormaster completed remote builds in B13538: Diff 35249.Mar 16 2021, 3:11 PM

Jacques Lucke (JacquesLucke) added inline comments.Mar 16 2021, 3:13 PM

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_line.cc
43	I think it would be good if the End Location and Offset are (0, 0, 1).
131	Please test this for `count <= 1`.
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_plane.cc
72 ↗	(On Diff #35229)	Can be simplified the same way as mentioned in the other comment.
84 ↗	(On Diff #35229)	I think it might be cleaner to just assign x, y, and z separately here.
92 ↗	(On Diff #35229)	`const`

Don't use magic values
Change ico sphere max subdivisions, use absolute value of radius
Line: Use the same socket for end and offset, improve handling of low resolutions and 0 count
Assign x, y, and z separately, use const

Harbormaster completed remote builds in B13544: Diff 35257.Mar 16 2021, 4:51 PM

Hans Goudey (HooglyBoogly) added inline comments.Mar 16 2021, 4:54 PM

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cone.cc
69	I used `top_is_point` which is just a bit shorter than what you suggested.
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_ico_sphere.cc
72	Okay, I'll stick with that then. It's very slow though!
source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_line.cc
43	So the line goes upward, sure.

Jacques Lucke (JacquesLucke) accepted this revision.Mar 16 2021, 5:15 PM

This revision is now accepted and ready to land.Mar 16 2021, 5:15 PM

Zino Guerr (Zino) awarded a token.Mar 16 2021, 10:24 PM

Hans Goudey (HooglyBoogly) edited the summary of this revision. (Show Details)Mar 16 2021, 10:28 PM

Closed by commit rB9a56a3865c06: Geometry Nodes: Add initial version of mesh primitives (authored by Hans Goudey (HooglyBoogly)). · Explain WhyMar 16 2021, 10:38 PM

This revision was automatically updated to reflect the committed changes.

Hans Goudey (HooglyBoogly) added a commit: rB9a56a3865c06: Geometry Nodes: Add initial version of mesh primitives.

Damian (damian) awarded a token.Mar 16 2021, 11:20 PM

Vyacheslav (hitrpr) awarded a token.Mar 17 2021, 8:59 AM

Great, now, at least we can generate exact amount of points!
I hope indexes will be exposed as attribute.

Already tested.
IMO primitives and mesh operations (like subdivide etc.) should be separated. Now they all mixed and it is confusing a bit, if you are new user and use menu.

In D10715#272552, @Vyacheslav (hitrpr) wrote:

Great, now, at least we can generate exact amount of points!
I hope indexes will be exposed as attribute.

Already tested.
IMO primitives and mesh operations (like subdivide etc.) should be separated. Now they all mixed and it is confusing a bit, if you are new user and use menu.

IMO primitives and mesh operations (like subdivide etc.) should be separated.

Yes, definitely, like the comment in nodeitems_builtins.py says, we'll need to do some refactoring of the add menu before adding these to a sub-menu. But I hope to do that for 2.93.

Rafael Campos (Rafafcdk) awarded a token.Mar 18 2021, 8:24 AM

Geometry Nodes: Add initial version of mesh primitives
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Diff 35153

release/scripts/startup/nodeitems_builtins.py

source/blender/blenkernel/BKE_node.h

source/blender/blenkernel/intern/node.cc

source/blender/blenlib/BLI_float3.hh

source/blender/makesdna/DNA_node_types.h

source/blender/makesrna/intern/rna_nodetree.c

source/blender/nodes/CMakeLists.txt

source/blender/nodes/NOD_geometry.h

source/blender/nodes/NOD_static_types.h

source/blender/nodes/geometry/node_geometry_util.hh

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_circle.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cone.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cube.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cylinder.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_ico_sphere.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_line.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_uv_sphere.cc

source/blender/nodes/geometry/nodes/node_geo_transform.cc

Geometry Nodes: Add initial version of mesh primitivesClosedPublicActions

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Diff 35153

release/scripts/startup/nodeitems_builtins.py

source/blender/blenkernel/BKE_node.h

source/blender/blenkernel/intern/node.cc

source/blender/blenlib/BLI_float3.hh

source/blender/makesdna/DNA_node_types.h

source/blender/makesrna/intern/rna_nodetree.c

source/blender/nodes/CMakeLists.txt

source/blender/nodes/NOD_geometry.h

source/blender/nodes/NOD_static_types.h

source/blender/nodes/geometry/node_geometry_util.hh

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_circle.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cone.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cube.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_cylinder.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_ico_sphere.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_line.cc

source/blender/nodes/geometry/nodes/node_geo_mesh_primitive_uv_sphere.cc

source/blender/nodes/geometry/nodes/node_geo_transform.cc

Geometry Nodes: Add initial version of mesh primitives
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