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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLClipPlanesPainter.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkOpenGLClipPlanesPainter.h"
#include "vtkActor.h"
#include "vtkMatrix4x4.h"
#include "vtkObjectFactory.h"
#include "vtkPlane.h"
#include "vtkPlaneCollection.h"
#include "vtkOpenGLError.h"
#include "vtkOpenGL.h"
#include "vtkOpenGLError.h"
vtkStandardNewMacro(vtkOpenGLClipPlanesPainter);
//-----------------------------------------------------------------------------
vtkOpenGLClipPlanesPainter::vtkOpenGLClipPlanesPainter()
{
}
//-----------------------------------------------------------------------------
vtkOpenGLClipPlanesPainter::~vtkOpenGLClipPlanesPainter()
{
}
//-----------------------------------------------------------------------------
void vtkOpenGLClipPlanesPainter::RenderInternal(vtkRenderer *renderer,
vtkActor *actor,
unsigned long typeflags,
bool forceCompileOnly)
{
vtkOpenGLClearErrorMacro();
vtkPlaneCollection *clipPlanes;
vtkPlane *plane;
int i, numClipPlanes;
double planeEquation[4];
clipPlanes = this->ClippingPlanes;
if (clipPlanes == NULL)
{
numClipPlanes = 0;
}
else
{
numClipPlanes = clipPlanes->GetNumberOfItems();
if (numClipPlanes > 6)
{
vtkErrorMacro(<< "OpenGL has a limit of 6 clipping planes");
numClipPlanes = 6;
}
}
for (i = 0; i < numClipPlanes; i++)
{
glEnable(static_cast<GLenum>(GL_CLIP_PLANE0+i));
}
if ( clipPlanes )
{
double *mat = *actor->GetMatrix()->Element;
double origin[4], normal[3];
for (i = 0; i < numClipPlanes; i++)
{
plane = static_cast<vtkPlane *>(clipPlanes->GetItemAsObject(i));
plane->GetOrigin(origin);
plane->GetNormal(normal);
// Compute the plane equation
double v1 = normal[0];
double v2 = normal[1];
double v3 = normal[2];
double v4 = -(v1*origin[0] + v2*origin[1] + v3*origin[2]);
// Transform normal from world to data coords
planeEquation[0] = v1*mat[0] + v2*mat[4] + v3*mat[8] + v4*mat[12];
planeEquation[1] = v1*mat[1] + v2*mat[5] + v3*mat[9] + v4*mat[13];
planeEquation[2] = v1*mat[2] + v2*mat[6] + v3*mat[10] + v4*mat[14];
planeEquation[3] = v1*mat[3] + v2*mat[7] + v3*mat[11] + v4*mat[15];
glClipPlane(static_cast<GLenum>(GL_CLIP_PLANE0+i), planeEquation);
}
}
this->Superclass::RenderInternal(renderer, actor, typeflags,forceCompileOnly);
for (i = 0; i < numClipPlanes; i++)
{
glDisable(static_cast<GLenum>(GL_CLIP_PLANE0+i));
}
vtkOpenGLCheckErrorMacro("failed after RenderInternal");
}
//-----------------------------------------------------------------------------
void vtkOpenGLClipPlanesPainter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
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