[vtkusers] Light source similar to a flashlight?

[Bill Lorensen]

Apparently, if the renderer has a light at the first render, it does
not create a default light.

Move the AddLight after renderWindow->Render(); and you'll see the
original light also.

On Sun, Nov 25, 2012 at 8:15 AM, David Doria <daviddoria at gmail.com> wrote:
> On Sun, Nov 25, 2012 at 8:07 AM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>>
>> Move the light to 0,0,2 and you will see it. I'm not yet sure why this
>> works.
>
>
> When I move the light to (0,0,2), I do see one side of the plane (from the
> viewpoint of the light) (an explanation of why would indeed be helpful :) ),
> but the back of the plane is still black. I assume this has something to do
> with the direction of the plane's normal, but I don't understand why you can
> see the back of the plane without the light, but not with the light.
> Whatever ambient light was available in the scene before adding the new
> light should still be there after the additional light is added, no?
>
> David



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