couple of silly B3D questions...

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Just wondered if anyone had any thoughts on these 2 things that have been at the back of my mind for ages -

1. you can set a light to be brighter than 255,255,255, and it does indeed make the scene even brighter, but the docs say the numbers should be 0..255. Why does it work going even brighter? Is it just muliplied up with no side-effects?

2. surfaces - I know more surfaces = less speed, but if I have lots of objects all using the same texture, do they get rendered as a single surface, or will they class as seperate surfaces because they are seperate objects?