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diff --git a/APEX_1.4/include/turbulencefs/SubstanceSourceActor.h b/APEX_1.4/include/turbulencefs/SubstanceSourceActor.h
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+/*
+ * Copyright (c) 2008-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * NVIDIA CORPORATION and its licensors retain all intellectual property
+ * and proprietary rights in and to this software, related documentation
+ * and any modifications thereto.  Any use, reproduction, disclosure or
+ * distribution of this software and related documentation without an express
+ * license agreement from NVIDIA CORPORATION is strictly prohibited.
+ */
+
+#ifndef SUBSTANCE_SOURCE_ACTOR_H
+#define SUBSTANCE_SOURCE_ACTOR_H
+
+#include "Apex.h"
+#include "Shape.h"
+
+namespace nvidia
+{
+namespace apex
+{
+
+class SubstanceSourceAsset;
+
+
+/**
+ \brief Turbulence ScalarSource Actor class
+ */
+class SubstanceSourceActor : public Actor
+{
+protected:
+	virtual ~SubstanceSourceActor() {}
+
+public:
+	///Returns the asset the instance has been created from.
+	virtual SubstanceSourceAsset*		getSubstanceSourceAsset() const = 0;
+
+	/** 
+	\brief enable whether or not to use density in the simulation (enabling density reduces performance).
+	
+	If you are enabling density then you also need to add substance sources (without substance sources you will see no effect of density on the simulation, except a drop in performance)
+	*/
+	virtual void 						setEnabled(bool enable) = 0;
+
+	///Returns true if substance source enabled
+	virtual bool 						isEnabled() const = 0;
+
+	///intersect the collision shape against a given AABB
+	virtual bool						intersectAgainstAABB(PxBounds3) = 0;
+
+	///Returns pointer to Shape of substance source
+	virtual  Shape* 					getShape() const = 0;
+
+	///If it is a box, cast to box class, return NULL otherwise
+	virtual BoxShape* 					getBoxShape() = 0;
+
+	///If it is a sphere, cast to sphere class, return NULL otherwise
+	virtual SphereShape* 				getSphereShape() = 0;
+
+	///Return average value of density
+	virtual float						getAverageDensity() const = 0;
+
+	///Return STD value of density
+	virtual float						getStdDensity() const = 0;
+
+	///Set average and STD values for density
+	virtual void						setDensity(float averageDensity, float stdDensity) = 0;
+
+	///Sets the uniform overall object scale
+	virtual void						setCurrentScale(float scale) = 0;
+
+	///Retrieves the uniform overall object scale
+	virtual float						getCurrentScale(void) const = 0;
+
+	virtual void						release() = 0;
+};
+
+
+}
+} // end namespace nvidia
+
+#endif