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/*=========================================================================
Program: Visualization Toolkit
Module: vtkTextureMapToCylinder.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 "vtkTextureMapToCylinder.h"
#include "vtkCellData.h"
#include "vtkDataSet.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkLine.h"
#include "vtkMath.h"
#include "vtkOBBTree.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
vtkStandardNewMacro(vtkTextureMapToCylinder);
// Create object with cylinder axis parallel to z-axis (points (0,0,-0.5)
// and (0,0,0.5)). The PreventSeam ivar is set to true. The cylinder is
// automatically generated.
vtkTextureMapToCylinder::vtkTextureMapToCylinder()
{
this->Point1[0] = 0.0;
this->Point1[1] = 0.0;
this->Point1[2] = -0.5;
this->Point2[0] = 0.0;
this->Point2[1] = 0.0;
this->Point2[2] = 0.5;
this->AutomaticCylinderGeneration = 1;
this->PreventSeam = 1;
}
int vtkTextureMapToCylinder::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// get the input and output
vtkDataSet *input = vtkDataSet::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkDataSet *output = vtkDataSet::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkFloatArray *newTCoords;
vtkIdType numPts=input->GetNumberOfPoints();
vtkIdType ptId;
int i;
double x[3], tc[2], thetaX, thetaY, closest[3], v[3];
double axis[3], vP[3], vec[3];
vtkDebugMacro(<<"Generating Cylindrical Texture Coordinates");
// First, copy the input to the output as a starting point
output->CopyStructure( input );
if ( numPts < 1 )
{
vtkErrorMacro(<<"Can't generate texture coordinates without points");
return 1;
}
if ( this->AutomaticCylinderGeneration )
{
vtkPoints *pts=vtkPoints::New(); pts->SetNumberOfPoints(numPts);
double corner[3], max[3], mid[3], min[3], size[3], l;
vtkOBBTree *OBB = vtkOBBTree::New();
for ( ptId=0; ptId < numPts; ptId++ )
{
input->GetPoint(ptId, x);
pts->SetPoint(ptId,x);
}
OBB->ComputeOBB(pts,corner,max,mid,min,size);
pts->Delete();
OBB->Delete();
for ( i=0; i < 3; i++)
{
l = (mid[i] + min[i])/2.0;
this->Point1[i] = corner[i] + l;
this->Point2[i] = corner[i] + max[i] + l;
}
vtkDebugMacro(<<"Cylinder axis computed as \tPoint1: ("
<< this->Point1[0] <<", " << this->Point1[1] <<", "
<< this->Point1[2] <<")\n\t\t\t\tPoint2: ("
<< this->Point2[0] <<", " << this->Point2[1] <<", "
<< this->Point2[2] <<")");
}
//compute axis which is theta (angle measure) origin
for ( i=0; i < 3; i++ )
{
axis[i] = this->Point2[i] - this->Point1[i];
}
if ( vtkMath::Norm(axis) == 0.0 )
{
vtkErrorMacro(<<"Bad cylinder axis");
return 1;
}
v[0] = 1.0; v[1] = v[2] = 0.0;
vtkMath::Cross(axis,v,vP);
if ( vtkMath::Norm(vP) == 0.0 )
{//must be prependicular
v[1] = 1.0; v[0] = v[2] = 0.0;
vtkMath::Cross(axis,v,vP);
}
vtkMath::Cross(vP,axis,vec);
if ( vtkMath::Normalize(vec) == 0.0 )
{
vtkErrorMacro(<<"Bad cylinder axis");
return 1;
}
newTCoords = vtkFloatArray::New();
newTCoords->SetName("Texture Coordinates");
newTCoords->SetNumberOfComponents(2);
newTCoords->Allocate(2*numPts);
//loop over all points computing spherical coordinates
for ( ptId=0; ptId < numPts; ptId++ )
{
input->GetPoint(ptId, x);
vtkLine::DistanceToLine(x,this->Point1,this->Point2,tc[1],closest);
for (i=0; i < 3; i++)
{
v[i] = x[i] - closest[i];
}
vtkMath::Normalize(v);
thetaX = acos ((double)vtkMath::Dot(v,vec));
vtkMath::Cross(vec,v,vP);
thetaY = vtkMath::Dot(axis,vP); //not really interested in angle, just +/- sign
if ( this->PreventSeam )
{
tc[0] = thetaX / vtkMath::Pi();
}
else
{
tc[0] = thetaX / (2.0*vtkMath::Pi());
if ( thetaY < 0.0 )
{
tc[0] = 1.0 - tc[0];
}
}
newTCoords->InsertTuple(ptId,tc);
}
output->GetPointData()->CopyTCoordsOff();
output->GetPointData()->PassData(input->GetPointData());
output->GetCellData()->PassData(input->GetCellData());
output->GetPointData()->SetTCoords(newTCoords);
newTCoords->Delete();
return 1;
}
void vtkTextureMapToCylinder::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Automatic Cylinder Generation: " <<
(this->AutomaticCylinderGeneration ? "On\n" : "Off\n");
os << indent << "Prevent Seam: " <<
(this->PreventSeam ? "On\n" : "Off\n");
os << indent << "Point1: (" << this->Point1[0] << ", "
<< this->Point1[1] << ", "
<< this->Point1[2] << ")\n";
os << indent << "Point2: (" << this->Point2[0] << ", "
<< this->Point2[1] << ", "
<< this->Point2[2] << ")\n";
}
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