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 /*
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 /** @file light.h
  *  @brief Defines the aiLight data structure
  */
 
 #pragma once
 #ifndef AI_LIGHT_H_INC
 #define AI_LIGHT_H_INC
 
 #ifdef __GNUC__
 #   pragma GCC system_header
 #endif
 
 #include <assimp/types.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // ---------------------------------------------------------------------------
 /** Enumerates all supported types of light sources.
  */
 enum aiLightSourceType {
     aiLightSource_UNDEFINED     = 0x0,
 
     //! A directional light source has a well-defined direction
     //! but is infinitely far away. That's quite a good
     //! approximation for sun light.
     aiLightSource_DIRECTIONAL   = 0x1,
 
     //! A point light source has a well-defined position
     //! in space but no direction - it emits light in all
     //! directions. A normal bulb is a point light.
     aiLightSource_POINT         = 0x2,
 
     //! A spot light source emits light in a specific
     //! angle. It has a position and a direction it is pointing to.
     //! A good example for a spot light is a light spot in
     //! sport arenas.
     aiLightSource_SPOT          = 0x3,
 
     //! The generic light level of the world, including the bounces
     //! of all other light sources.
     //! Typically, there's at most one ambient light in a scene.
     //! This light type doesn't have a valid position, direction, or
     //! other properties, just a color.
     aiLightSource_AMBIENT       = 0x4,
 
     //! An area light is a rectangle with predefined size that uniformly
     //! emits light from one of its sides. The position is center of the
     //! rectangle and direction is its normal vector.
     aiLightSource_AREA          = 0x5,
 
     /** This value is not used. It is just there to force the
      *  compiler to map this enum to a 32 Bit integer.
      */
 #ifndef SWIG
     _aiLightSource_Force32Bit = INT_MAX
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** Helper structure to describe a light source.
  *
  *  Assimp supports multiple sorts of light sources, including
  *  directional, point and spot lights. All of them are defined with just
  *  a single structure and distinguished by their parameters.
  *  Note - some file formats (such as 3DS, ASE) export a "target point" -
  *  the point a spot light is looking at (it can even be animated). Assimp
  *  writes the target point as a sub-node of a spot-lights's main node,
  *  called "<spotName>.Target". However, this is just additional information
  *  then, the transformation tracks of the main node make the
  *  spot light already point in the right direction.
 */
 struct aiLight {
     /** The name of the light source.
      *
      *  There must be a node in the scene-graph with the same name.
      *  This node specifies the position of the light in the scene
      *  hierarchy and can be animated.
      */
     C_STRUCT aiString mName;
 
     /** The type of the light source.
      *
      * aiLightSource_UNDEFINED is not a valid value for this member.
      */
     C_ENUM aiLightSourceType mType;
 
     /** Position of the light source in space. Relative to the
      *  transformation of the node corresponding to the light.
      *
      *  The position is undefined for directional lights.
      */
     C_STRUCT aiVector3D mPosition;
 
     /** Direction of the light source in space. Relative to the
      *  transformation of the node corresponding to the light.
      *
      *  The direction is undefined for point lights. The vector
      *  may be normalized, but it needn't.
      */
     C_STRUCT aiVector3D mDirection;
 
     /** Up direction of the light source in space. Relative to the
      *  transformation of the node corresponding to the light.
      *
      *  The direction is undefined for point lights. The vector
      *  may be normalized, but it needn't.
      */
     C_STRUCT aiVector3D mUp;
 
     /** Constant light attenuation factor.
      *
      *  The intensity of the light source at a given distance 'd' from
      *  the light's position is
      *  @code
      *  Atten = 1/( att0 + att1 * d + att2 * d*d)
      *  @endcode
      *  This member corresponds to the att0 variable in the equation.
      *  Naturally undefined for directional lights.
      */
     float mAttenuationConstant;
 
     /** Linear light attenuation factor.
      *
      *  The intensity of the light source at a given distance 'd' from
      *  the light's position is
      *  @code
      *  Atten = 1/( att0 + att1 * d + att2 * d*d)
      *  @endcode
      *  This member corresponds to the att1 variable in the equation.
      *  Naturally undefined for directional lights.
      */
     float mAttenuationLinear;
 
     /** Quadratic light attenuation factor.
      *
      *  The intensity of the light source at a given distance 'd' from
      *  the light's position is
      *  @code
      *  Atten = 1/( att0 + att1 * d + att2 * d*d)
      *  @endcode
      *  This member corresponds to the att2 variable in the equation.
      *  Naturally undefined for directional lights.
      */
     float mAttenuationQuadratic;
 
     /** Diffuse color of the light source
      *
      *  The diffuse light color is multiplied with the diffuse
      *  material color to obtain the final color that contributes
      *  to the diffuse shading term.
      */
     C_STRUCT aiColor3D mColorDiffuse;
 
     /** Specular color of the light source
      *
      *  The specular light color is multiplied with the specular
      *  material color to obtain the final color that contributes
      *  to the specular shading term.
      */
     C_STRUCT aiColor3D mColorSpecular;
 
     /** Ambient color of the light source
      *
      *  The ambient light color is multiplied with the ambient
      *  material color to obtain the final color that contributes
      *  to the ambient shading term. Most renderers will ignore
      *  this value it, is just a remaining of the fixed-function pipeline
      *  that is still supported by quite many file formats.
      */
     C_STRUCT aiColor3D mColorAmbient;
 
     /** Inner angle of a spot light's light cone.
      *
      *  The spot light has maximum influence on objects inside this
      *  angle. The angle is given in radians. It is 2PI for point
      *  lights and undefined for directional lights.
      */
     float mAngleInnerCone;
 
     /** Outer angle of a spot light's light cone.
      *
      *  The spot light does not affect objects outside this angle.
      *  The angle is given in radians. It is 2PI for point lights and
      *  undefined for directional lights. The outer angle must be
      *  greater than or equal to the inner angle.
      *  It is assumed that the application uses a smooth
      *  interpolation between the inner and the outer cone of the
      *  spot light.
      */
     float mAngleOuterCone;
 
     /** Size of area light source. */
     C_STRUCT aiVector2D mSize;
 
 #ifdef __cplusplus
 
     aiLight() AI_NO_EXCEPT
         :   mType                 (aiLightSource_UNDEFINED)
         ,   mAttenuationConstant  (0.f)
         ,   mAttenuationLinear    (1.f)
         ,   mAttenuationQuadratic (0.f)
         ,   mAngleInnerCone       ((float)AI_MATH_TWO_PI)
         ,   mAngleOuterCone       ((float)AI_MATH_TWO_PI)
         ,   mSize                 (0.f, 0.f)
     {
     }
 
 #endif
 };
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // !! AI_LIGHT_H_INC

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