Compositor: Expose track velocity via the Track Position node

velocity is measured in pixels per frame. It is basically a coordinate
difference of track coordinate at current frame and previous one (no future
prediction happens).

It's not really most intuitive place for such a things, but historically the
node was called this way..

Track velocity could be used to face effects like motion blur bu piping it
to the vector blur node.

Reviewers: campbellbarton

Reviewed By: campbellbarton

Subscribers: hype, sebastian_k

Differential Revision: https://developer.blender.org/D1591

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/compositor/operations/COM_TrackPositionOperation.h b/source/blender/compositor/operations/COM_TrackPositionOperation.h
index 10dbaf96646..a5a58ad9f09 100644
--- a/source/blender/compositor/operations/COM_TrackPositionOperation.h
+++ b/source/blender/compositor/operations/COM_TrackPositionOperation.h
@@ -47,6 +47,7 @@ protected:
 	int m_axis;
 	int m_position;
 	int m_relativeFrame;
+	bool m_speed_output;
 
 	int m_width, m_height;
 	float m_markerPos[2];
@@ -67,6 +68,7 @@ public:
 	void setAxis(int value) {this->m_axis = value;}
 	void setPosition(int value) {this->m_position = value;}
 	void setRelativeFrame(int value) {this->m_relativeFrame = value;}
+	void setSpeedOutput(bool speed_output) {this->m_speed_output = speed_output;};
 
 	void initExecution();