From 65d294c38554b222d8aa70bbad39e9fc0edcd076 Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Thu, 8 Jun 2023 16:26:11 -0400
Subject: [PATCH] Geometry Nodes: Use smaller grain size for sampe nearest
 surface node

This increases the framerate in a production file from about 2.3 to 2.5
FPS, and reduces gaps in a profile where the CPU was waiting for just
a few threads to finish the BVH tree lookups. If BVH lookups become
faster in the future, this grain size could be increased.
---
 .../geometry/nodes/node_geo_sample_nearest_surface.cc      | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/source/blender/nodes/geometry/nodes/node_geo_sample_nearest_surface.cc b/source/blender/nodes/geometry/nodes/node_geo_sample_nearest_surface.cc
index f4520a16d3a..0d59f52cadf 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_sample_nearest_surface.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_sample_nearest_surface.cc
@@ -140,6 +140,13 @@ class SampleNearestSurfaceFunction : public mf::MultiFunction {
     const Mesh &mesh = *source_.get_mesh_for_read();
     get_closest_mesh_looptris(mesh, positions, mask, triangle_index, {}, sample_position);
   }
+
+  ExecutionHints get_execution_hints() const override
+  {
+    ExecutionHints hints;
+    hints.min_grain_size = 512;
+    return hints;
+  }
 };
 
 static GField get_input_attribute_field(GeoNodeExecParams &params, const eCustomDataType data_type)