Fixed the lag with Follow Path and optimized constraint loops with Track To and Lock Track. I was plainly disabling the refresh of the target, but that caused a lag (3D window, not Render). Now, it raises a flag when it find a loop, so it only disables the refreshing when it needs to.

This is a temporary fix, but a complete fix will require a rewrite of of some part of the where_is_object function, and that would take too much time before 2.31.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 6dbbf0d1697..10e29759347 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -483,6 +483,9 @@ short get_constraint_target (bConstraint *con, short ownertype, void* ownerdata,
 			data = (bTrackToConstraint*)con->data;
 
 			if (data->tar){
+				// Refresh the object if it isn't a constraint loop
+				if (!(con->flag & CONSTRAINT_NOREFRESH))
+					where_is_object_time (data->tar, ctime);	
 				constraint_target_to_mat4(data->tar, data->subtarget, mat, size, ctime);
 				valid=1;
 			}
@@ -511,6 +514,10 @@ short get_constraint_target (bConstraint *con, short ownertype, void* ownerdata,
 			data = (bLockTrackConstraint*)con->data;
 
 			if (data->tar){
+				// Refresh the object if it isn't a constraint loop
+				if (!(con->flag & CONSTRAINT_NOREFRESH))
+					where_is_object_time (data->tar, ctime);	
+
 				constraint_target_to_mat4(data->tar, data->subtarget, mat, size, ctime);
 				valid=1;
 			}
@@ -528,6 +535,8 @@ short get_constraint_target (bConstraint *con, short ownertype, void* ownerdata,
 				float q[4], vec[4], dir[3], *quat, x1, totmat[4][4];
 				float curvetime;
 
+				where_is_object_time (data->tar, ctime);	
+
 				Mat4One (totmat);
 
 				cu= data->tar->data;