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 /** @file camera.h
  *  @brief Defines the aiCamera data structure
  */
 
 #pragma once
 #ifndef AI_CAMERA_H_INC
 #define AI_CAMERA_H_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #include "types.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // ---------------------------------------------------------------------------
 /** Helper structure to describe a virtual camera.
  *
  * Cameras have a representation in the node graph and can be animated.
  * An important aspect is that the camera itself is also part of the
  * scene-graph. This means, any values such as the look-at vector are not
  * *absolute*, they're <b>relative</b> to the coordinate system defined
  * by the node which corresponds to the camera. This allows for camera
  * animations. For static cameras parameters like the 'look-at' or 'up' vectors
  * are usually specified directly in aiCamera, but beware, they could also
  * be encoded in the node transformation. The following (pseudo)code sample
  * shows how to do it: <br><br>
  * @code
  * // Get the camera matrix for a camera at a specific time
  * // if the node hierarchy for the camera does not contain
  * // at least one animated node this is a static computation
  * get-camera-matrix (node sceneRoot, camera cam) : matrix
  * {
  *    node   cnd = find-node-for-camera(cam)
  *    matrix cmt = identity()
  *
  *    // as usual - get the absolute camera transformation for this frame
  *    for each node nd in hierarchy from sceneRoot to cnd
  *      matrix cur
  *      if (is-animated(nd))
  *         cur = eval-animation(nd)
  *      else cur = nd->mTransformation;
  *      cmt = mult-matrices( cmt, cur )
  *    end for
  *
  *    // now multiply with the camera's own local transform
  *    cam = mult-matrices (cam, get-camera-matrix(cmt) )
  * }
  * @endcode
  *
  * @note some file formats (such as 3DS, ASE) export a "target point" -
  * the point the camera is looking at (it can even be animated). Assimp
  * writes the target point as a subnode of the camera's main node,
  * called "<camName>.Target". However this is just additional information
  * then the transformation tracks of the camera main node make the
  * camera already look in the right direction.
  *
 */
 struct aiCamera {
     /** The name of the camera.
      *
      *  There must be a node in the scenegraph with the same name.
      *  This node specifies the position of the camera in the scene
      *  hierarchy and can be animated.
      */
     C_STRUCT aiString mName;
 
     /** Position of the camera relative to the coordinate space
      *  defined by the corresponding node.
      *
      *  The default value is 0|0|0.
      */
     C_STRUCT aiVector3D mPosition;
 
     /** 'Up' - vector of the camera coordinate system relative to
      *  the coordinate space defined by the corresponding node.
      *
      *  The 'right' vector of the camera coordinate system is
      *  the cross product of  the up and lookAt vectors.
      *  The default value is 0|1|0. The vector
      *  may be normalized, but it needn't.
      */
     C_STRUCT aiVector3D mUp;
 
     /** 'LookAt' - vector of the camera coordinate system relative to
      *  the coordinate space defined by the corresponding node.
      *
      *  This is the viewing direction of the user.
      *  The default value is 0|0|1. The vector
      *  may be normalized, but it needn't.
      */
     C_STRUCT aiVector3D mLookAt;
 
     /** Horizontal field of view angle, in radians.
      *
      *  The field of view angle is the angle between the center
      *  line of the screen and the left or right border.
      *  The default value is 1/4PI.
      */
     float mHorizontalFOV;
 
     /** Distance of the near clipping plane from the camera.
      *
      * The value may not be 0.f (for arithmetic reasons to prevent
      * a division through zero). The default value is 0.1f.
      */
     float mClipPlaneNear;
 
     /** Distance of the far clipping plane from the camera.
      *
      * The far clipping plane must, of course, be further away than the
      * near clipping plane. The default value is 1000.f. The ratio
      * between the near and the far plane should not be too
      * large (between 1000-10000 should be ok) to avoid floating-point
      * inaccuracies which could lead to z-fighting.
      */
     float mClipPlaneFar;
 
     /** Screen aspect ratio.
      *
      * This is the ration between the width and the height of the
      * screen. Typical values are 4/3, 1/2 or 1/1. This value is
      * 0 if the aspect ratio is not defined in the source file.
      * 0 is also the default value.
      */
     float mAspect;
 
     /** Half horizontal orthographic width, in scene units.
      *
      *  The orthographic width specifies the half width of the
      *  orthographic view box. If non-zero the camera is
      *  orthographic and the mAspect should define to the
      *  ratio between the orthographic width and height
      *  and mHorizontalFOV should be set to 0.
      *  The default value is 0 (not orthographic).
      */
     float mOrthographicWidth;
 #ifdef __cplusplus
 
     aiCamera() AI_NO_EXCEPT
             : mUp(0.f, 1.f, 0.f),
               mLookAt(0.f, 0.f, 1.f),
               mHorizontalFOV(0.25f * (float)AI_MATH_PI),
               mClipPlaneNear(0.1f),
               mClipPlaneFar(1000.f),
               mAspect(0.f),
               mOrthographicWidth(0.f) {}
 
     /** @brief Get a *right-handed* camera matrix from me
      *  @param out Camera matrix to be filled
      */
     void GetCameraMatrix(aiMatrix4x4 &out) const {
         /** todo: test ... should work, but i'm not absolutely sure */
 
         /** We don't know whether these vectors are already normalized ...*/
         aiVector3D zaxis = mLookAt;
         zaxis.Normalize();
         aiVector3D yaxis = mUp;
         yaxis.Normalize();
         aiVector3D xaxis = mUp ^ mLookAt;
         xaxis.Normalize();
 
         out.a4 = -(xaxis * mPosition);
         out.b4 = -(yaxis * mPosition);
         out.c4 = -(zaxis * mPosition);
 
         out.a1 = xaxis.x;
         out.a2 = xaxis.y;
         out.a3 = xaxis.z;
 
         out.b1 = yaxis.x;
         out.b2 = yaxis.y;
         out.b3 = yaxis.z;
 
         out.c1 = zaxis.x;
         out.c2 = zaxis.y;
         out.c3 = zaxis.z;
 
         out.d1 = out.d2 = out.d3 = 0.f;
         out.d4 = 1.f;
     }
 
 #endif
 };
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif // AI_CAMERA_H_INC

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