I was trying to figure out how big an area light should be to simulate the  
sun when the light is a lot closer than the sun actually is. Looking at a  
wall about 3m high I noticed the shadow on the ground blurred about 3cm. I  
came to the conclusion that the diameter of my light should be about 1% of  
the distance from the object. To test my theory I looked up the diameter  
of the sun and the distance from the sun to the earth. Close enough! The  
diameter of the sun is 1 391 000 km and the distance from the earth to the  
sun is 149,669,180 km. That's 0.929% :)


-- 
-Nekar Xenos-

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