Pixelflinger 14532a2e69 several fog fixes ...

- inScatteringSize actually cannot be set to zero because it produces
  a 0^0 in the shader. So with this change, in-scattering must be
  strictly > 0 to enable.

- inScatteringSize on the java side had an incorrect default value of
  zero (which of course, now doesn't matter anymore).

- also clamp the fog altitude to 1mm which simplifies the shader quite
  a bit for the same result.

Fixes #3069

2020-09-16 00:18:49 -07:00

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