00001 /*========================================================================= 00002 00003 Program: Visualization Toolkit 00004 Module: $RCSfile: vtkRayCastStructures.h,v $ 00005 Language: C++ 00006 00007 00008 Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 00009 All rights reserved. 00010 00011 Redistribution and use in source and binary forms, with or without 00012 modification, are permitted provided that the following conditions are met: 00013 00014 * Redistributions of source code must retain the above copyright notice, 00015 this list of conditions and the following disclaimer. 00016 00017 * Redistributions in binary form must reproduce the above copyright notice, 00018 this list of conditions and the following disclaimer in the documentation 00019 and/or other materials provided with the distribution. 00020 00021 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names 00022 of any contributors may be used to endorse or promote products derived 00023 from this software without specific prior written permission. 00024 00025 * Modified source versions must be plainly marked as such, and must not be 00026 misrepresented as being the original software. 00027 00028 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' 00029 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00030 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00031 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR 00032 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00033 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 00034 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00035 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00036 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00037 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00038 00039 =========================================================================*/ 00040 00054 #ifndef __vtkRayCastStructures_h 00055 #define __vtkRayCastStructures_h 00056 00057 typedef struct 00058 { 00059 // These are the input values that define the ray. Depending on 00060 // whether we are casting a WorldRay or a ViewRay, these are in 00061 // world coordinates or view coordinates. 00062 float Origin[3]; 00063 float Direction[3]; 00064 00065 // The pixel location for the ray that is being cast can be 00066 // important, for example if hardware ray bounding is being used 00067 // and the location in the depth buffer must be matched to this 00068 // ray. 00069 int Pixel[2]; 00070 00071 // The world coordinate location of the camera is important for the 00072 // ray caster to be able to return a Z value for the intersection 00073 float CameraPosition[3]; 00074 00075 // This input value defines the size of the image 00076 int ImageSize[2]; 00077 00078 // These are input values for clipping but may be changed 00079 // along the way 00080 float NearClip; 00081 float FarClip; 00082 00083 // These are the return values - RGBA and Z 00084 float Color[4]; 00085 float Depth; 00086 00087 00088 // Some additional space that may be useful for the 00089 // specific implementation of the ray caster. This structure 00090 // is a convenient place to put it, since there is one 00091 // per thread so that writing to these locations is safe 00092 00093 // Ray information transformed into local coordinates 00094 float TransformedStart[4]; 00095 float TransformedEnd[4]; 00096 float TransformedDirection[4]; 00097 float TransformedIncrement[3]; 00098 00099 // The number of steps we want to take if this is 00100 // a ray caster that takes steps 00101 int NumberOfStepsToTake; 00102 00103 // The number of steps we actually take if this is 00104 // a ray caster that takes steps 00105 int NumberOfStepsTaken; 00106 00107 } VTKRayCastRayInfo; 00108 00109 #endif