[Bf-blender-cvs] [498ba75] master: 2D stabilization: by default init anchor_frame to frame 1

[Ichthyostega]

Commit: 498ba756abeec746322b883d98ba6a192f37e7ea
Author: Ichthyostega
Date:   Mon Aug 22 17:29:19 2016 +0200
Branches: master
https://developer.blender.org/rB498ba756abeec746322b883d98ba6a192f37e7ea

2D stabilization: by default init anchor_frame to frame 1

It is common in blender to use 1-based counting for
frame sequences (while 0-based is allowed). Thus
initializing to use frame 1 as reference for stabilization
is likely to produce smooth start values in most cases

===================================================================

M	source/blender/blenkernel/intern/tracking.c
M	source/blender/blenloader/intern/versioning_270.c

===================================================================

diff --git a/source/blender/blenkernel/intern/tracking.c b/source/blender/blenkernel/intern/tracking.c
index d5d3384..a86606f 100644
--- a/source/blender/blenkernel/intern/tracking.c
+++ b/source/blender/blenkernel/intern/tracking.c
@@ -330,7 +330,7 @@ void BKE_tracking_settings_init(MovieTracking *tracking)
 	tracking->settings.object_distance = 1;
 
 	tracking->stabilization.scaleinf = 1.0f;
-	tracking->stabilization.anchor_frame = MINFRAME;
+	tracking->stabilization.anchor_frame = 1;
 	zero_v2(tracking->stabilization.target_pos);
 	tracking->stabilization.target_rot = 0.0f;
 	tracking->stabilization.scale = 1.0f;
diff --git a/source/blender/blenloader/intern/versioning_270.c b/source/blender/blenloader/intern/versioning_270.c
index 1ef32d6..49ef8ba 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -1373,6 +1373,9 @@ void blo_do_versions_270(FileData *fd, Library *UNUSED(lib), Main *main)
 					 * now used always (as "target scale") */
 					clip->tracking.stabilization.scale = 1.0f;
 				}
+				/* blender prefers 1-based frame counting;
+				 * thus using frame 1 as reference typically works best */
+				clip->tracking.stabilization.anchor_frame = 1;
 				/* by default show the track lists expanded, to improve "discoverability" */
 				clip->tracking.stabilization.flag |= TRACKING_SHOW_STAB_TRACKS;
 				/* deprecated, not used anymore */