Lots of work on Audio & Physics engine:

-Added new 3D stream player node
-Added ability for Area to capture sound from streams
-Added small features in physics to be able to properly guess distance to areas for sound
-Fixed 3D CollisionObject so shapes are added the same as in 2D, directly from children
-Fixed KinematicBody API to make it the same as 2D.

1 files changed, 31 insertions, 0 deletions

diff --git a/scene/3d/spatial_velocity_tracker.h b/scene/3d/spatial_velocity_tracker.h
new file mode 100644
index 0000000000..65f3eaca93
--- /dev/null
+++ b/scene/3d/spatial_velocity_tracker.h
@@ -0,0 +1,31 @@
+#ifndef SPATIAL_VELOCITY_TRACKER_H
+#define SPATIAL_VELOCITY_TRACKER_H
+
+#include "scene/3d/spatial.h"
+
+class SpatialVelocityTracker : public Reference {
+	GDCLASS(SpatialVelocityTracker, Reference)
+
+	struct PositionHistory {
+		uint64_t frame;
+		Vector3 position;
+	};
+
+	bool fixed_step;
+	Vector<PositionHistory> position_history;
+	int position_history_len;
+
+protected:
+	static void _bind_methods();
+
+public:
+	void reset(const Vector3 &p_new_pos);
+	void set_track_fixed_step(bool p_use_fixed_step);
+	bool is_tracking_fixed_step() const;
+	void update_position(const Vector3 &p_position);
+	Vector3 get_tracked_linear_velocity() const;
+
+	SpatialVelocityTracker();
+};
+
+#endif // SPATIAL_VELOCITY_TRACKER_H