Pointclouds: support mesh <-> pointcloud in convert operator

Just converts verts to points and vice versa.
Materials and Attribute layers are preserved (so for example if you set
custom radii on the pointcloud, convert to mesh, then convert back to
pointcloud, this will be preserved).

Also not add a Radius layer by default (it is still added and
filled when adding a pointcloud object from the menu), a global Radius
property that will be used if there is no radius attribute can be added
later. A Radius attribute can also be added in the pointcloud data
properties (and filled via python).

This will also add a new utility function that copies materials between
datablocks: BKE_id_materials_copy

ref T75717

Differential Revision: https://developer.blender.org/D7391

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/material.c b/source/blender/blenkernel/intern/material.c
index 885cc1baefc..d8c0b5d6dce 100644
--- a/source/blender/blenkernel/intern/material.c
+++ b/source/blender/blenkernel/intern/material.c
@@ -535,6 +535,27 @@ static void material_data_index_clear_id(ID *id)
   }
 }
 
+void BKE_id_materials_copy(Main *bmain, ID *id_src, ID *id_dst)
+{
+  Material ***matar_src = BKE_id_material_array_p(id_src);
+  const short *materials_len_p_src = BKE_id_material_len_p(id_src);
+
+  Material ***matar_dst = BKE_id_material_array_p(id_dst);
+  short *materials_len_p_dst = BKE_id_material_len_p(id_dst);
+
+  *materials_len_p_dst = *materials_len_p_src;
+  if (*materials_len_p_src != 0) {
+    (*matar_dst) = MEM_dupallocN(*matar_src);
+
+    for (int a = 0; a < *materials_len_p_src; a++) {
+      id_us_plus((ID *)(*matar_dst)[a]);
+    }
+
+    DEG_id_tag_update(id_dst, ID_RECALC_COPY_ON_WRITE);
+    DEG_relations_tag_update(bmain);
+  }
+}
+
 void BKE_id_material_resize(Main *bmain, ID *id, short totcol, bool do_id_user)
 {
   Material ***matar = BKE_id_material_array_p(id);