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, 10 insertions, 10 deletions

diff --git a/source/blender/editors/space_nla/nla_edit.c b/source/blender/editors/space_nla/nla_edit.c
index 23cd504978c..5cf3ace747b 100644
--- a/source/blender/editors/space_nla/nla_edit.c
+++ b/source/blender/editors/space_nla/nla_edit.c
@@ -617,7 +617,7 @@ static int nlaedit_add_actionclip_exec(bContext *C, wmOperator *op)
 	nlaedit_add_tracks_empty(&ac);
 
 	/* get a list of the editable tracks being shown in the NLA
-	 *	- this is limited to active ones for now, but could be expanded to
+	 * - this is limited to active ones for now, but could be expanded to
 	 */
 	filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_ACTIVE | ANIMFILTER_FOREDIT);
 	items = ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
@@ -745,8 +745,8 @@ static int nlaedit_add_transition_exec(bContext *C, wmOperator *op)
 			if (IS_EQF(s1->end, s2->start))
 				continue;
 			/* make sure neither one is a transition
-			 *	- although this is impossible to create with the standard tools,
-			 *    the user may have altered the settings
+			 * - although this is impossible to create with the standard tools,
+			 *   the user may have altered the settings
 			 */
 			if (ELEM(NLASTRIP_TYPE_TRANSITION, s1->type, s2->type))
 				continue;
@@ -762,9 +762,9 @@ static int nlaedit_add_transition_exec(bContext *C, wmOperator *op)
 			strip->type = NLASTRIP_TYPE_TRANSITION;
 
 			/* generic settings
-			 *	- selected flag to highlight this to the user
-			 *	- auto-blends to ensure that blend in/out values are automatically
-			 *	  determined by overlaps of strips
+			 * - selected flag to highlight this to the user
+			 * - auto-blends to ensure that blend in/out values are automatically
+			 *   determined by overlaps of strips
 			 */
 			strip->flag = NLASTRIP_FLAG_SELECT | NLASTRIP_FLAG_AUTO_BLENDS;
 
@@ -1062,8 +1062,8 @@ static int nlaedit_duplicate_exec(bContext *C, wmOperator *op)
 				/* in case there's no space in the track above, or we haven't got a reference to it yet, try adding */
 				if (BKE_nlatrack_add_strip(nlt->next, nstrip) == 0) {
 					/* need to add a new track above the one above the current one
-					 *	- if the current one is the last one, nlt->next will be NULL, which defaults to adding
-					 *	  at the top of the stack anyway...
+					 * - if the current one is the last one, nlt->next will be NULL, which defaults to adding
+					 *   at the top of the stack anyway...
 					 */
 					track = BKE_nlatrack_add(adt, nlt->next);
 					BKE_nlatrack_add_strip(track, nstrip);
@@ -1213,7 +1213,7 @@ static void nlaedit_split_strip_actclip(Main *bmain, AnimData *adt, NlaTrack *nl
 	float splitframe, splitaframe;
 
 	/* calculate the frames to do the splitting at
-	 *	- use current frame if within extents of strip
+	 * - use current frame if within extents of strip
 	 */
 	if ((cfra > strip->start) && (cfra < strip->end)) {
 		/* use the current frame */
@@ -1509,7 +1509,7 @@ static int nlaedit_swap_exec(bContext *C, wmOperator *op)
 		}
 
 		/* get two selected strips only (these will be metas due to prev step) to operate on
-		 *  - only allow swapping 2, as with more the context becomes unclear
+		 * - only allow swapping 2, as with more the context becomes unclear
 		 */
 		for (strip = nlt->strips.first; strip; strip = stripN) {
 			stripN = strip->next;