00001 /*========================================================================= 00002 00003 Program: Visualization Toolkit 00004 Module: $RCSfile: vtkRayCastStructures.h,v $ 00005 00006 Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen 00007 All rights reserved. 00008 See Copyright.txt or http://www.kitware.com/Copyright.htm for details. 00009 00010 This software is distributed WITHOUT ANY WARRANTY; without even 00011 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00012 PURPOSE. See the above copyright notice for more information. 00013 00014 =========================================================================*/ 00015 00026 #ifndef __vtkRayCastStructures_h 00027 #define __vtkRayCastStructures_h 00028 00029 typedef struct 00030 { 00031 // These are the input values that define the ray. Depending on 00032 // whether we are casting a WorldRay or a ViewRay, these are in 00033 // world coordinates or view coordinates. 00034 float Origin[3]; 00035 float Direction[3]; 00036 00037 // The pixel location for the ray that is being cast can be 00038 // important, for example if hardware ray bounding is being used 00039 // and the location in the depth buffer must be matched to this 00040 // ray. 00041 int Pixel[2]; 00042 00043 // The world coordinate location of the camera is important for the 00044 // ray caster to be able to return a Z value for the intersection 00045 float CameraPosition[3]; 00046 00047 // This input value defines the size of the image 00048 int ImageSize[2]; 00049 00050 // These are input values for clipping but may be changed 00051 // along the way 00052 float NearClip; 00053 float FarClip; 00054 00055 // These are the return values - RGBA and Z 00056 float Color[4]; 00057 float Depth; 00058 00059 00060 // Some additional space that may be useful for the 00061 // specific implementation of the ray caster. This structure 00062 // is a convenient place to put it, since there is one 00063 // per thread so that writing to these locations is safe 00064 00065 // Ray information transformed into local coordinates 00066 float TransformedStart[4]; 00067 float TransformedEnd[4]; 00068 float TransformedDirection[4]; 00069 float TransformedIncrement[3]; 00070 00071 // The number of steps we want to take if this is 00072 // a ray caster that takes steps 00073 int NumberOfStepsToTake; 00074 00075 // The number of steps we actually take if this is 00076 // a ray caster that takes steps 00077 int NumberOfStepsTaken; 00078 00079 } vtkRayCastRayInfo; 00080 00081 #endif
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