Geometry Nodes: Add Attribute Proximity Node

This node calculates a distance from each point to the closest position
on a target geometry, similar to the vertex weight proximity modifier.
Mapping the output distance to a different range can be done with an
attribute math node after this node.

A drop-down changes whether to calculate distances from points,
edges, or faces. In points mode, the node also calculates distances
from point cloud points.

Design task and use cases: T84842

Differential Revision: https://developer.blender.org/D10154

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_bvhutils.h b/source/blender/blenkernel/BKE_bvhutils.h
index 84a17136361..78908908343 100644
--- a/source/blender/blenkernel/BKE_bvhutils.h
+++ b/source/blender/blenkernel/BKE_bvhutils.h
@@ -38,6 +38,7 @@ struct BMEditMesh;
 struct MFace;
 struct MVert;
 struct Mesh;
+struct PointCloud;
 
 struct BVHCache;
 
@@ -249,6 +250,20 @@ float bvhtree_sphereray_tri_intersection(const BVHTreeRay *ray,
                                          const float v1[3],
                                          const float v2[3]);
 
+typedef struct BVHTreeFromPointCloud {
+  struct BVHTree *tree;
+
+  BVHTree_NearestPointCallback nearest_callback;
+
+  const float (*coords)[3];
+} BVHTreeFromPointCloud;
+
+BVHTree *BKE_bvhtree_from_pointcloud_get(struct BVHTreeFromPointCloud *data,
+                                         const struct PointCloud *pointcloud,
+                                         const int tree_type);
+
+void free_bvhtree_from_pointcloud(struct BVHTreeFromPointCloud *data);
+
 /**
  * BVHCache
  */