Am 17.09.2015 um 23:17 schrieb Alain:

>> I've tried applying your settings to my own scene, but am not getting
>> any reflectivity off the bricks. Could you take a look? The finish is
>> defined in "l3p_materials_noshadow_1.4_uber.inc" at line 58. Thanks!
>>
>>
>> Michael
> 
> When you use "fresnel", you also must provide an interior block where
> you set the ior for that material.
> If you don't, the ior default's to 1 whitch prety much kill reflectivity.

Actually "pretty much" is an understatement; "totally" would be more to
the point ;)

> A good starting point for the ior is in the range 1.4 to 1.8.
> Water's ior is about 1.3.
> Most plastics are in the 1.45 to 1.67 range, same for common glass.

Solid LEGO bricks are made of acrylonitrile butadiene styrene (ABS),
while transparent LEGO bricks are made of Makrolon, a polycarbonate
(PC); for both families of plastics, an ior of about 1.6 is a very good
approximation.

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