Method SetDistance

Rendering/Core/vtkCamera.cxx:575–604

------------------------------------------------------------------------------ Set the distance of the focal point from the camera. The focal point is modified accordingly. This should be positive.

// Set the distance of the focal point from the camera. The focal point is
// modified accordingly. This should be positive.
void vtkCamera::SetDistance(double d)
{
  if (this->Distance == d)
  {
    return;
  }

  this->Distance = d;

  // Distance should be greater than .0002
  if (this->Distance < 0.0002)
  {
    this->Distance = 0.0002;
    vtkDebugMacro(<< " Distance is set to minimum.");
  }

  // we want to keep the camera pointing in the same direction
  double* vec = this->DirectionOfProjection;

  // recalculate FocalPoint
  this->FocalPoint[0] = this->Position[0] + vec[0] * this->Distance;
  this->FocalPoint[1] = this->Position[1] + vec[1] * this->Distance;
  this->FocalPoint[2] = this->Position[2] + vec[2] * this->Distance;

  vtkDebugMacro(<< " Distance set to ( " << this->Distance << ")");

  this->ComputeViewTransform();
  this->ComputeCameraLightTransform();
  this->Modified();
}

//------------------------------------------------------------------------------
// This method must be called when the focal point or camera position changes