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+/**
+  @file GLight.h
+
+  @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+
+  @created 2003-11-12
+  @edited  2009-11-08
+*/
+
+#ifndef G3D_GLight_h
+#define G3D_GLight_h
+
+#include "G3D/platform.h"
+#include "G3D/Vector4.h"
+#include "G3D/Vector3.h"
+#include "G3D/Color4.h"
+
+namespace G3D {
+class Any;
+
+/**
+ A light representation that closely follows the OpenGL light format.
+ */
+class GLight  {
+public:
+    /** World space position (for a directional light, w = 0 */
+    Vector4             position;
+
+    /** For a spot or directional light, this is the "right vector" that will be used when constructing
+        a reference frame(). */
+    Vector3             rightDirection;
+
+    /** Direction in which the light faces, if a spot light.  This is the "look vector" of the light source. */
+    Vector3             spotDirection;
+
+    /** In <B>degrees</B>.  180 = no cutoff (point/dir).  Values less than 90 = spot light */
+    float               spotCutoff;
+
+    /** If true, G3D::SuperShader will render a cone of light large
+        enough to encompass the entire square that bounds the cutoff
+        angle. This produces a square prism instead of a cone of light
+        when used with a G3D::ShadowMap.  for an unshadowed light this
+        has no effect.*/
+    bool                spotSquare;
+
+    /** Constant, linear, quadratic */
+    float               attenuation[3];
+
+    /** May be outside the range [0, 1] */
+    Color3              color;
+
+    /** If false, this light is ignored */
+    bool                enabled;
+
+    /** If false, this light does not create specular highlights
+        (useful when using negative lights). */
+    bool                specular;
+
+    /** If false, this light does not create diffuse illumination
+        (useful when rendering a specular-only pass). */
+    bool                diffuse;
+
+    GLight();
+   
+    /** Accepted forms:
+        - GLight::directional( vector3, color3, [bool, [bool]])
+        - GLight::spot(vector3, vector3, #, color3, [#, [#, [#, [#, [bool, [bool]]]])
+        - GLight::point(vector3, color3, [#, [#, [#, [#, [bool, [bool]]]])
+        - GLight { [all fields] }
+    */
+    GLight(const Any& any);
+    
+    /** Converts the Color3 to an Any. */
+    operator Any() const;
+
+    /** @param toLight will be normalized */
+    static GLight directional(const Vector3& toLight, const Color3& color, bool specular = true, bool diffuse = true);
+
+    static GLight point(const Vector3& pos, const Color3& color, float constAtt = 1, float linAtt = 0, float quadAtt = 0.5f, bool specular = true, bool diffuse = true);
+
+    /** @param pointDirection Will be normalized.  Points in the
+        direction that light propagates.
+
+        @param cutOffAngleDegrees Must be on the range [0, 90]. This
+        is the angle from the point direction to the edge of the light
+        cone.  I.e., a value of 45 produces a light with a 90-degree 
+        cone of view.
+    */
+    static GLight spot(const Vector3& pos, const Vector3& pointDirection, float cutOffAngleDegrees, 
+                       const Color3& color, float constAtt = 1, float linAtt = 0, float quadAtt = 0,
+                       bool specular = true, bool diffuse = true);
+
+    /** Returns the sphere within which this light has some noticable effect.  May be infinite.
+        @param cutoff The value at which the light intensity is considered negligible. */
+    class Sphere effectSphere(float cutoff = 30.0f / 255) const;
+
+    /** Computes a reference frame (e.g., for use with G3D::ShadowMap */
+    class CoordinateFrame frame() const;
+
+    bool operator==(const GLight& other) const;
+    bool operator!=(const GLight& other) const;
+};
+
+} // namespace
+#endif
+