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glm/gtx/quaternion.hpp

@@ -177,6 +177,34 @@ namespace glm
 		vec<3, T, P> const & orig, 
 		vec<3, T, P> const & dest);
 
+		/// Build a look at quaternion based on the default handedness.
+	///
+	/// @param direction Desired direction of the camera.
+	/// @param up Up vector, how the camera is oriented.. Typically (0, 0, 1).
+	template<typename T, precision P>
+	GLM_FUNC_DECL tquat<T, P> quatLookAt(
+		tvec3<T, P> const & direction,
+		tvec3<T, P> const & up);
+
+	/// Build a right-handed look at quaternion.
+	///
+	/// @param direction Desired direction of the camera.
+	/// @param up Up vector, how the camera is oriented. Typically (0, 0, 1).
+	template<typename T, precision P>
+	GLM_FUNC_DECL tquat<T, P> quatLookAtRH(
+		tvec3<T, P> const & direction,
+		tvec3<T, P> const & up);
+
+	/// Build a left-handed look at quaternion.
+	///
+	/// @param eye Position of the camera
+	/// @param direction Desired direction onto which the +z-axis gets mapped
+	/// @param up Up vector, how the camera is oriented. Typically (0, 0, 1).
+	template <typename T, precision P>
+	GLM_FUNC_DECL tquat<T, P> quatLookAtLH(
+		tvec3<T, P> const & direction,
+		tvec3<T, P> const & up);
+	
 	/// Returns the squared length of x.
 	/// 
 	/// @see gtx_quaternion

glm/gtx/quaternion.inl

@@ -209,4 +209,38 @@ namespace glm
 			rotationAxis.z * invs);
 	}
 	
+	template<typename T, precision P>
+	GLM_FUNC_QUALIFIER tquat<T, P> quatLookAt(tvec3<T, P> const& direction, tvec3<T, P> const& up)
+	{
+#		if GLM_COORDINATE_SYSTEM == GLM_LEFT_HANDED
+			return quatLookAtLH(direction, up);
+#		else
+			return quatLookAtRH(direction, up);
+# 		endif
+	}
+
+	template<typename T, precision P>
+	GLM_FUNC_QUALIFIER tquat<T, P> quatLookAtRH(tvec3<T, P> const& direction, tvec3<T, P> const& up)
+	{
+		tmat3x3<T, P> Result(uninitialize);
+
+		Result[2] = -normalize(direction);
+		Result[0] = normalize(cross(up, Result[2]));
+		Result[1] = cross(Result[2], Result[0]);
+
+		return quat_cast(Result);
+	}
+
+	template<typename T, precision P>
+	GLM_FUNC_QUALIFIER tquat<T, P> quatLookAtLH(tvec3<T, P> const& direction, tvec3<T, P> const& up)
+	{
+		tmat3x3<T, P> Result(uninitialize);
+
+		Result[2] = normalize(direction);
+		Result[0] = normalize(cross(up, Result[2]));
+		Result[1] = cross(Result[2], Result[0]);
+
+		return quat_cast(Result);
+	}
+
 }//namespace glm