[vtkusers] Lighting coefficients "SetSpecular", "SetAmbient" and "SetDiffuse"

[Bryn Lloyd]

Hi

 

I would like to get the same effect using a vtkActor as with following
OpenGL code:

    float light_ambient[] = {0.3f,0.3f,0.3f,1.0f};

    float mat_spec[] = {0.8f,0.8f,0.8f,1.0f};

    float mat_diff[] = {0.3f,0.2f,0.8f,1.0f};

    float mat_shininess[] = { 32.0f };

    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_spec);

    glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diff);

    glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

    glLightfv(GL_LIGHT0, GL_AMBIENT ,light_ambient);

 

    glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

 

 

I have tried following VTK code (the light is at the same position):

 

                     actor->GetProperty()->SetInterpolationToFlat();

                     actor->GetProperty()->SetAmbient(0.3);

                     actor->GetProperty()->SetDiffuse(1.0);

                     actor->GetProperty()->SetSpecular(0.5);

                     actor->GetProperty()->SetAmbientColor(0.3, 0.3, 0.3);

                     actor->GetProperty()->SetDiffuseColor(1.0, 0.0, 0.0);

                     actor->GetProperty()->SetSpecularColor(0.8, 0.8, 0.8);

                     actor->GetProperty()->SetSpecularPower(32.0);

 

The effect is different though. I am unclear about the light coefficients
set using "SetSpecular", "SetAmbient" and "SetDiffuse".

What does this correspond to? If I set all to 1.0, then it seems I get only
the specular effect.

 

Thanks

Bryn

 

 

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