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When I use dynamics lights for car, it generates non circle spotlights.
Do you know why ? Please help me ?

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This is not the right place to post this.
Your post should be in the scripting section of the forum.

The reason that the lightspots are not round is because dynamic lights are vertex lights and the geometry doesn't have many polygons.
The more the polygons the better vertex lighting looks.
With more polygons the fps is decreased though.