Adjusted temperature variation per world

[angelacmaio]

Adjusted ambient (in-scene) temperature variation per world to better represent contrast across different environments.

Side note: the <temperature_gradient> parameter does not cause ambient temperature to change by altitude as the SDFormat specs suggest.

[osrf-jenkins]

Build finished. 21 tests run, 0 skipped, 0 failed.

[iche033]

Looking through the temperature gradients in the world, the values are from 0.2 to 0.7.

Here's a mapping of temperature gradient to the computed temperature range:

gradient (K/m) -> range (K)
0.2 -> 10.0477
0.3 -> 15.0715
0.4 -> 20.0953
0.5 -> 25.1192
0.6 -> 30.143
0.7 -> 35.1668

if these values are fine then changes look good to me.

[angelacmaio]

@iche033 those values are fine. It seems like a very large variation, but the thermal camera output looks reasonable especially when comparing environment variation to artifact temps. Thanks!