Mathias Agopian b92af357f7 add a material option to use linear fog calculations (#9030) ...

The new `linearFog` material property, when set to `true` enables a
simplified fog calculation. The fog equation becomes linear which is
unrealistic, but more efficient to compute. In some situations with
a shallow fog range, it doesn't make a huge difference visually.

In this mode, height falloff and in-scattering are ignored.

The linear equation slope is calculated from the regular parameters to
match the slope of the real equation at a camera height. If 
`heightFalloff` is disabled, set to 0, the `density` parameter 
exactly corresponds to the slope of the equation in [1/m] units.

2025-08-07 01:33:36 -07:00

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