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graphics/vtkEncodedGradientShader.h

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00001 /*=========================================================================
00002 
00003   Program:   Visualization Toolkit
00004   Module:    $RCSfile: vtkEncodedGradientShader.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 
00060 #ifndef __vtkEncodedGradientShader_h
00061 #define __vtkEncodedGradientShader_h
00062 
00063 #include "vtkObject.h"
00064 
00065 class vtkVolume;
00066 class vtkRenderer;
00067 class vtkEncodedGradientEstimator;
00068 
00069 #define VTK_MAX_SHADING_TABLES   100
00070 
00071 class VTK_EXPORT vtkEncodedGradientShader : public vtkObject
00072 {
00073 public:
00074   static vtkEncodedGradientShader *New();
00075   vtkTypeMacro(vtkEncodedGradientShader,vtkObject);
00076 
00078   void PrintSelf( ostream& os, vtkIndent index );
00079 
00082   vtkSetClampMacro( ZeroNormalDiffuseIntensity,  float, 0.0, 1.0);
00083   vtkGetMacro( ZeroNormalDiffuseIntensity, float );
00084   vtkSetClampMacro( ZeroNormalSpecularIntensity, float, 0.0, 1.0);
00085   vtkGetMacro( ZeroNormalSpecularIntensity, float );
00086 
00088   void UpdateShadingTable( vtkRenderer *ren, vtkVolume *vol,
00089             vtkEncodedGradientEstimator *gradest);
00090 
00092   float *GetRedDiffuseShadingTable(    vtkVolume *vol );
00093   float *GetGreenDiffuseShadingTable(  vtkVolume *vol );
00094   float *GetBlueDiffuseShadingTable(   vtkVolume *vol );
00095   float *GetRedSpecularShadingTable(   vtkVolume *vol );
00096   float *GetGreenSpecularShadingTable( vtkVolume *vol );
00097   float *GetBlueSpecularShadingTable(  vtkVolume *vol );
00098 
00099 protected:
00100   vtkEncodedGradientShader();
00101   ~vtkEncodedGradientShader();
00102   vtkEncodedGradientShader(const vtkEncodedGradientShader&) {};
00103   void operator=(const vtkEncodedGradientShader&) {};
00104 
00117   void  BuildShadingTable( int index,
00118             float lightDirection[3],
00119             float lightColor[3],
00120             float lightIntensity,
00121             float viewDirection[3],
00122             float material[4],
00123             int twoSided,
00124             vtkEncodedGradientEstimator *gradest,
00125             int updateFlag );
00126   
00127   // The six shading tables (r diffuse ,g diffuse ,b diffuse, 
00128   // r specular, g specular, b specular ) - with an entry for each
00129   // encoded normal plus one entry at the end for the zero normal
00130   // There is one shading table per volume listed in the ShadingTableVolume
00131   // array. A null entry indicates an available slot.
00132   float                        *ShadingTable[VTK_MAX_SHADING_TABLES][6];
00133   vtkVolume                    *ShadingTableVolume[VTK_MAX_SHADING_TABLES];
00134   int                          ShadingTableSize[VTK_MAX_SHADING_TABLES];
00135 
00136   // The intensity of light used for the zero normals, since it
00137   // can not be computed from the normal angles. Defaults to 0.0.
00138   float    ZeroNormalDiffuseIntensity;
00139   float    ZeroNormalSpecularIntensity;
00140 }; 
00141 
00142 
00143 #endif

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