Geometry Nodes: Add index and value inputs to sample curve node

As described in T92474 and T91650, this patch adds two features to the
sample curve node. First is an index input, to allow choosing the curve
to sample for each point. Second is a custom field input, which is
evaluated on the control points of the curve and then sampled like the
other outputs. There is an "All Curves" option for the old behavior
which takes the length of all curves into account.

For invalid curve indices, the node outputs zeros (default values).
Invalid lengths and factors are clamped.

There have been various discussions about splitting the node up more,
but this is an intuitive combination of options and will work well
enough for current use cases. The node could still be generalized more
in the future.

Keep in mind that the source field is evaluated on curve control points,
not the evaluated points used for sampling. This is necessary so that
fields like "Index" work as expected.

Differential Revision: https://developer.blender.org/D16147

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_blender_version.h b/source/blender/blenkernel/BKE_blender_version.h
index 806fff2099e..1a642cf4eb3 100644
--- a/source/blender/blenkernel/BKE_blender_version.h
+++ b/source/blender/blenkernel/BKE_blender_version.h
@@ -25,7 +25,7 @@ extern "C" {
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 5
+#define BLENDER_FILE_SUBVERSION 6
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and show a warning if the file