[vtkusers] Bug in vtk opengl light

[Carsten Kübler]

Hej,

GL_SPOT_CUTOFF is defined in the range [0,90] and 180 but not ]90,180[

    // set up spot parameters if neccesary
    if (this->ConeAngle < 180.0)
      {
      Info[0] = dx;
      Info[1] = dy;
      Info[2] = dz;
      glLightfv((GLenum)light_index, GL_SPOT_DIRECTION, Info );
      glLightf((GLenum)light_index, GL_SPOT_EXPONENT, this->Exponent);
      glLightf((GLenum)light_index, GL_SPOT_CUTOFF, this->ConeAngle);
      }
    else
      {
      glLighti((GLenum)light_index, GL_SPOT_CUTOFF, 180);
      }


which is the right solution?
      glLightf((GLenum)light_index, GL_SPOT_CUTOFF, this->ConeAngle);
     -->
      glLightf((GLenum)light_index, GL_SPOT_CUTOFF, this->ConeAngle/2);

      if (this->ConeAngle < 180.0)
     -->
      if (this->ConeAngle < 90.0)


Carsten

-- 
Dipl.-Inf. Carsten Kübler

Institute for Process Control & Robotics  
Universität Karlsruhe (TH)	Tel.:  +49 721/608-8934 
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