add Time step setter to API

src/Library/APIFunctions.cpp

@@ -75,6 +75,15 @@ extern "C"
 		return true;
 	}
 
+	API_FUNCTION bool SetSimulationTimeStep(float result_dt)
+	{
+		if (cs == nullptr)
+			return false;
+
+		cs->GetWorld()->SetDeltaTime(result_dt);	
+		return true;	
+	}
+
 	API_FUNCTION bool DoSimulationSteps(int nrSteps)
 	{
 		if (cs == nullptr)

src/Library/APIFunctions.h

@@ -58,6 +58,11 @@ extern "C"{
 	/// <returns>true if the operation was successful; false otherwise, i.e. if the simulation has not been initialized (correctly) yet.</returns>
 	API_FUNCTION bool GetSimulationTimeStep(float& result_dt);
 
+	/// <summary>Sets the step size of the simulation, in seconds.</summary>
+	/// <param ref="result_dt">[out] Will set the step size of the simulation.</param>
+	/// <returns>true if the operation was successful; false otherwise, i.e. if the simulation has not been initialized (correctly) yet.</returns>
+	API_FUNCTION bool SetSimulationTimeStep(float result_dt);
+
 	/// <summary>Performs the given number of simulation steps. 
 	/// To obtain the resulting status of the simulation, use the GetAgentPositions() function.</summary>
 	/// <param ref="nrSteps">The number of steps to perform.</param>