assimp/include/aiCamera.h

/*
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Open Asset Import Library (ASSIMP)
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*/

/** @file Defines the aiCamera data structure
 */

#ifndef AI_CAMERA_H_INC
#define AI_CAMERA_H_INC

#include "aiTypes.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.
 * 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 point 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.
	 */
	aiString mName;

	/** Position of the camera relative to the coordinate space
	 *  defined by the corresponding node.
	 *
	 *  The default value is 0|0|0.
	 */
	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.
	 */
	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.
	 */
	aiVector3D mLookAt;


	/** Half 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 farer away than the
	 * near clipping plane. The default value is 1000.f. The radio
	 * 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;

#ifdef __cplusplus

	aiCamera()
		: 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)
	{
	}

#endif
};


#ifdef __cplusplus
}
#endif

#endif // AI_CAMERA_H_INC