hallo everybody!<br>I've set a light in my program, in this way:<br> vtkLight *light1 = vtkLight::New();<br> light1->SetPosition(x,y,z);<br> light1->SetColor(1.0,1.0,1.0);<br><br>but it doesn't illuminate the scene.. (I want to illuminate an actor representing an isosurface, but it always looks black :( )<br><br>what could be wrong?<br>should I set any other paramater?<br>or may be the face-culling is off? (how can I correct it?)<br>or what else?<br><br>thanks a lot<br>Ale<br><p> 
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