[vtkusers] How to draw line strips with smoothly varying colors ?

[Dingrong Yi]

Hello,

I want to draw line strips with vtk (basically OpenGL). Each 3D vertex on
the line have a color. I would like to draw lines with smoothly changing
colors between each two vertex. However, I have not a clear pipeline for
doing this.

What I tried is as follows which cause segmentation error. Please help.

Thanks.

Dingrong



#include <stdlib.h>
#include <math.h>
#ifdef _WIN32
#include "vtkWin32OpenGLRenderWindow.h"
#else
#include "vtkOpenGLRenderWindow.h"
#endif
#include "vtkOpenGLRenderer.h"
#include "vtkOpenGLActor.h"
#include <GL/gl.h>

int main()
{
  vtkOpenGLRenderWindow *renWin = vtkOpenGLRenderWindow::New();
  vtkOpenGLRenderer *ren = vtkOpenGLRenderer::New();
  renWin->AddRenderer(ren);
  glBegin(GL_LINES);
  glVertex3f(0.0,0.0,0.0);
  glColor3f(0.0,0.0,1.0);
  glVertex3f(1.0,1.0,1.0);
   glColor3f(0.0,0.0,1.0);
  glEnd();

  //ren->AddActor(aObject);
  return 0;
}