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IndexE3d_CameraUpdateViewDirection E3d_CameraCalcOrbit E3d_CameraDefault E3d_CameraSet E3d_CameraAllocate E3d_CameraFree E3d_CameraUpdateViewDirectionCalculate ViewDistance and the unit-length vector of the line of sightSyntax void E3d_CameraUpdateViewDirection(E3dCamera* LCamera)Argument E3dCamera* LCamera Pointer to the Camera structureDescription Calculates the ViewDistance and the unit-length vector of the line of sight for the given Camera and sets the appropriate fields in the Camera structure. Return value None. See also E3d_CameraCalcUpVector E3d_CameraCalcOrbitCalculate camera Longitude & Latitude angles from positionSyntax void E3d_CameraCalcOrbit(E3dCamera* LCamera)Argument E3dCamera* LCamera Pointer to the Camera structureDescription Computes the Longitude & Latitude angles from the cameara and interest position. Return value None. See also E3d_CameraCalcUpVector, E3d_CameraUpdateViewDirection E3d_CameraDefaultInitialize Camera structureSyntax void E3d_CameraDefault(E3dCamera* LCamera)Argument E3dCamera* LCamera Pointer to the Camera structureDescription E3d_CameraDefault initializes an E3dCamera structure to reasonable default values. This function must be called for E3dCamera structures not allocated by E3d_CameraAllocate(). Return value None. E3d_CameraSetInitialize Camera position and field-of-viewSyntax void E3d_CameraSet(E3dCamera* LCamera, double LXPos, double LYPos, double LZPos,
double LFieldOfView, double LZoom, double LZNear, double LZFar,
double LEyeDistance)
ArgumentE3dCamera* LCamera Pointer to the Camera structure double LXPos Position X double LYPos Position Y double LZPos Position Z double LFieldOfView Field of view in degrees in the Y direction double LZoom Zoom factor for orthogonal views double LZNear Near clipping plane Z depth double LZFar Far clipping plane Z depth double LEyeDistance Eye distance for stereoscopic 3DDescription E3d_CameraSet initializes an E3dCamera structure to the given values and updates the Camera's auxiliary information. Return value None. E3d_CameraAllocateAllocate and initialize a Camera structureSyntax E3dCamera* E3d_CameraAllocate(void)Arguments None. Description E3d_CameraAllocate allocates and initializes an new E3dCamera structure. Return value Pointer to the newly allocated E3dCamera structure or NULL in case of an error. E3d_CameraFreeFree a Camera structureSyntax void E3d_CameraFree(E3dCamera* LCamera)Argument E3dCamera* LCamera The Camera structure to be freedDescription This function first decrements the reference count (RefCnt) of the given Camera structure (if it's not already zero). After that, if RefCnt is still greater than zero, it means that something other than the function calling E3d_CameraFree() is still referring to this Camera, so E3d_CameraFree() will simply return. If RefCnt is zero, E3d_CameraFree() will free the Camera structure. Return value None. |