Cycles: Improved robustness of hair motion blur.motion_curve_fix

In some instances, the number of control vertices of a hair could change mid-frame.
Cycles would then be unable to calculate proper motion blur for those hairs. This adds
interpolated CVs to fill in for the missing data. While this will not necessarily result in
a fully accurate reconstruction of the guide hair, it preserves motion blur instead of disabling it.

Reviewers: #cycles, sergey

Reviewed By: #cycles, sergey

Subscribers: sergey, brecht, #cycles

Tags: #cycles

Differential Revision: https://developer.blender.org/D3695

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/compositor/operations/COM_SunBeamsOperation.cpp b/source/blender/compositor/operations/COM_SunBeamsOperation.cpp
index 40f2ee226ae..e556d366353 100644
--- a/source/blender/compositor/operations/COM_SunBeamsOperation.cpp
+++ b/source/blender/compositor/operations/COM_SunBeamsOperation.cpp
@@ -16,7 +16,7 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  *
  * Contributor:
- *		Lukas Toenne
+ *      Lukas Toenne
  */
 
 #include "MEM_guardedalloc.h"
@@ -141,7 +141,7 @@ struct BufferLineAccumulator {
 
 	/**
 	 * Perform the actual accumulation along a ray segment from source to pt.
-	 * Only pixels withing dist_min..dist_max contribute.
+	 * Only pixels within dist_min..dist_max contribute.
 	 *
 	 * The loop runs backwards(!) over the primary sector space axis u, i.e. increasing distance to pt.
 	 * After each step it decrements v by dv < 1, adding a buffer shift when necessary.