Am 02.09.2014 18:11, schrieb LanuHum:
> 50 sphere_sweep with one material:
> 44 - good, AA - good
> 6 - error: color white, AA off

The AA problem is certainly just a side effect of the underlying bug. 
Most likely the texture computations for the respective sphere sweeps 
yield a result that is "Not a Number" (NaN, e.g. due to an attempt to 
take the square root of a negative number or the like) or infinity; 
anti-aliasing can't digest these values, and comes up with NaN or 
infinity for the entire pixels.

It is only after anti-aliasing, when the value is converted to the 8-bit 
integer range, that it turns into a sane value (and only because 
integers don't have values to represent NaN or infinity); on some 
platforms this value is zero, yielding black, while on other systems it 
is the maximum possible integer value, yielding white.

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