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Mesh: Cache loose vertices #105567

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Hans Goudey merged 29 commits from HooglyBoogly/blender:mesh-loose-vert-cache into main 2023-04-22 13:46:23 +02:00
Conversation 3 Commits 29 Files Changed 16 +212 -138
Hans Goudey commented 2023-03-08 15:31:26 +01:00
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Similar to the cache of loose edges added in 1ea169d90e,
cache the number of loose vertices and which are loose in a bit map.
This can save significant time when drawing large meshes in the
viewport, because recalculations can be avoided when the data doesn't
change, and because many geometry nodes set the loose geometry caches
eagerly when the meshes contain no loose elements.

There are two types of loose vertices:

  1. Vertices not used by any edges or faces
    Mesh.loose_verts()
  2. Vertices not used by any faces (may be used by loose edges)
    Mesh.verts_no_face()

Because both are used by Blender in various places, because the cost
is only a bit per vertex (or constant at best) and because of design
consistency, we cache both types of loose elements. The bit maps will
only be allocated when they're actually used, but they are already
accessed in a few important places:

  • Attribute domain interpolation
  • Subdivision surface modifier
  • Viewport drawing

Just the skipping viewport drawing calculation after certain geometry
nodes setups can have a large impact. Here is the time taken by
viewport loose geometry extraction before and after the change:

  • 4 million vertex grid node: 28 ms to 0 ms
  • Large molecular nodes setup (curve to mesh node): 104 ms to 0 ms
  • Realize instances with 1 million cubes: 131 ms to 0 ms
Similar to the cache of loose edges added in 1ea169d90e39647eac72, cache the number of loose vertices and which are loose in a bit map. This can save significant time when drawing large meshes in the viewport, because recalculations can be avoided when the data doesn't change, and because many geometry nodes set the loose geometry caches eagerly when the meshes contain no loose elements. There are two types of loose vertices: 1. Vertices not used by any edges or faces `Mesh.loose_verts()` 2. Vertices not used by any faces (may be used by loose edges) `Mesh.verts_no_face()` Because both are used by Blender in various places, because the cost is only a bit per vertex (or constant at best) and because of design consistency, we cache both types of loose elements. The bit maps will only be allocated when they're actually used, but they are already accessed in a few important places: - Attribute domain interpolation - Subdivision surface modifier - Viewport drawing Just the skipping viewport drawing calculation after certain geometry nodes setups can have a large impact. Here is the time taken by viewport loose geometry extraction before and after the change: - 4 million vertex grid node: 28 ms to 0 ms - Large molecular nodes setup (curve to mesh node): 104 ms to 0 ms - Realize instances with 1 million cubes: 131 ms to 0 ms
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Hans Goudey added 1 commit 2023-03-08 15:31:38 +01:00
Mesh: Cache loose vertices
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Similar to the cache of loose edges added in 1ea169d90e, cache
the number of loose vertices and which are loose in a bit map. This
can save significant time when drawing large meshes in the viewport.
Hans Goudey added this to the Modeling project 2023-03-08 15:32:54 +01:00
Hans Goudey commented 2023-03-08 15:33:33 +01:00
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@blender-bot build

@blender-bot build
Hans Goudey added 4 commits 2023-03-08 19:09:23 +01:00
Fix: Return correct cache for verts
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Hans Goudey commented 2023-03-08 19:09:38 +01:00
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@blender-bot build

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Hans Goudey changed title from Mesh: Cache loose vertices to WIP: Mesh: Cache loose vertices 2023-03-08 21:36:48 +01:00
Hans Goudey added 2 commits 2023-03-22 16:42:01 +01:00
Hans Goudey added 1 commit 2023-03-22 17:43:31 +01:00
Hans Goudey added 2 commits 2023-03-27 13:23:05 +02:00
Hans Goudey added 3 commits 2023-03-28 00:29:50 +02:00
Hans Goudey added 1 commit 2023-03-28 00:58:05 +02:00
Cleanup
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Hans Goudey changed title from WIP: Mesh: Cache loose vertices to Mesh: Cache loose vertices 2023-03-28 00:58:27 +02:00
Hans Goudey commented 2023-03-28 00:58:39 +02:00
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@blender-bot build

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Hans Goudey requested review from Jacques Lucke 2023-03-28 01:14:54 +02:00
Hans Goudey added this to the 3.6 LTS milestone 2023-03-30 16:31:07 +02:00
Hans Goudey added 1 commit 2023-03-31 17:57:30 +02:00
Hans Goudey added 1 commit 2023-04-04 22:27:14 +02:00
Hans Goudey added 4 commits 2023-04-14 18:53:04 +02:00
Hans Goudey added 1 commit 2023-04-16 22:10:02 +02:00
Hans Goudey added 2 commits 2023-04-17 14:10:59 +02:00
Jacques Lucke requested changes 2023-04-21 13:02:03 +02:00
source/blender/blenkernel/intern/bvhutils.cc Outdated
@ -1145,3 +1145,1 @@
static BitVector<> loose_verts_map_get(const Span<blender::int2> edges,
int verts_num,
int *r_loose_vert_num)
static BitVector<> loose_verts_map_get(const Mesh &mesh, int *r_loose_vert_num)
Jacques Lucke commented 2023-04-21 12:50:38 +02:00
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Does this intentionally return by value instead of const-references? Same below.

Does this intentionally return by value instead of const-references? Same below.
HooglyBoogly marked this conversation as resolved
source/blender/makesdna/DNA_mesh_types.h Outdated
@ -307,6 +317,9 @@ typedef struct Mesh {
* cache dirty. If the mesh was changed first, the relevant dirty tags should be called first.
*/
void loose_edges_tag_none() const;
void loose_verts_edge_tag_none() const;
Jacques Lucke commented 2023-04-21 12:55:24 +02:00
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Why are these const? Aren't these function you should call after changing the topology when having non-const access to the mesh? BKE_mesh_tag_positions_changed is non-const as well.

Why are these `const`? Aren't these function you should call after changing the topology when having non-const access to the mesh? `BKE_mesh_tag_positions_changed` is non-const as well.
Hans Goudey commented 2023-04-21 14:47:52 +02:00
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They're const because setting them doesn't change the logical state of the mesh. Let's say you're doing a mostly unrelated calculation and discover that there are no loose vertices, these could be called to pass that information elsewhere without changing the mesh.

BKE_mesh_tag_positions_changed is different, it means "I've changed the positions, the mesh is now different than it was".

They're const because setting them doesn't change the logical state of the mesh. Let's say you're doing a mostly unrelated calculation and discover that there are no loose vertices, these could be called to pass that information elsewhere without changing the mesh. `BKE_mesh_tag_positions_changed` is different, it means "I've changed the positions, the mesh is now different than it was".
source/blender/makesdna/DNA_mesh_types.h Outdated
@ -308,2 +318,4 @@
*/
void loose_edges_tag_none() const;
void loose_verts_edge_tag_none() const;
void loose_verts_face_tag_none() const;
Jacques Lucke commented 2023-04-21 12:58:37 +02:00
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It feels a bit like these tag functions are redundant. Shouldn't tag_no_loose_edges and tag_no_loose_verts methods be enough?

It feels a bit like these `tag` functions are redundant. Shouldn't `tag_no_loose_edges` and `tag_no_loose_verts` methods be enough?
Hans Goudey commented 2023-04-21 14:49:51 +02:00
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Generally they're used in similar situations, but not always. For example, the realize instances node:

  if (all_meshes_info.no_loose_verts_edge_hint) {
    dst_mesh->loose_verts_edge_tag_none();
  }
  if (all_meshes_info.no_loose_verts_face_hint) {
    dst_mesh->loose_verts_face_tag_none();
  }
Generally they're used in similar situations, but not always. For example, the realize instances node: ``` if (all_meshes_info.no_loose_verts_edge_hint) { dst_mesh->loose_verts_edge_tag_none(); } if (all_meshes_info.no_loose_verts_face_hint) { dst_mesh->loose_verts_face_tag_none(); } ```
Hans Goudey requested review from Jacques Lucke 2023-04-21 14:50:50 +02:00
Hans Goudey added 3 commits 2023-04-21 16:07:23 +02:00
Hans Goudey added 1 commit 2023-04-21 16:13:59 +02:00
Hans Goudey added 1 commit 2023-04-21 17:23:00 +02:00 
tag_verts_no_face_none is actually not redundant with
loose_edges_tag_none though, since it also contains loose verts.
Hans Goudey added 1 commit 2023-04-21 20:23:23 +02:00
Jacques Lucke approved these changes 2023-04-22 11:45:41 +02:00
Hans Goudey merged commit 8e967cfeaf into main 2023-04-22 13:46:23 +02:00
Hans Goudey deleted branch mesh-loose-vert-cache 2023-04-22 13:46:24 +02:00
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