How do I control light direction when using normal map

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Post » Fri Feb 03, 2017 2:17 pm

Hi there,
I'm in the process of using the bumpmapping effect to apply a shadow on a terrain and do not really undertand how to control light direction.
In the enclosed example, I'm using a circular normal map to simulate a top view of a dome and would like to illuminate it from where the yellow dot is dragged on the scene. Apparently, it's not that easy. Any tip about that ?
And also, the illuminated part of the dome is white white and I'd like to have it a lighter shade of the material. Also any tip for shadowing ?
Thanks ! ... .capx?dl=0
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