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ALS technical notes: Difference between revisions
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→Rain: Added that vector should be inverted if normals are pointing inwards.
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By default, the rain splashes impact from above (more precisely the +z direction in model coordinates). This may be inadequate if the aircraft is moving. However, the shader can not know what the airstream at the glass will be, so the impact vector of rain splashes has to be modeled aircraft-side and set via <code>environment/aircraft-effects/splash-vector-x</code> (<code>splash-vector-y</code>, <code>splash-vector-z</code>). These are likewise in model coordinates. | By default, the rain splashes impact from above (more precisely the +z direction in model coordinates). This may be inadequate if the aircraft is moving. However, the shader can not know what the airstream at the glass will be, so the impact vector of rain splashes has to be modeled aircraft-side and set via <code>environment/aircraft-effects/splash-vector-x</code> (<code>splash-vector-y</code>, <code>splash-vector-z</code>). These are likewise in model coordinates. | ||
As long as the length of the splash vector is less than 1, just the impact angle will change, as the length of the vector increases to 2, droplets will also be visibly moving. This allows fine control of the visuals dependent on any number of factors desired. A simple Nasal snipped varying the splash vector with airspeed for the F-16 is given below (but ''do not mindlessly copy and expect to work for any aircraft — it won't!'') | As long as the length of the splash vector is less than 1, just the impact angle will change, as the length of the vector increases to 2, droplets will also be visibly moving. This allows fine control of the visuals dependent on any number of factors desired. A simple Nasal snipped varying the splash vector with airspeed for the F-16 is given below (but ''do not mindlessly copy and expect to work for any aircraft — it won't!''). This example is for normals pointing outwards, if the normals are pointing inwards the vector needs to be inverted. | ||
<syntaxhighlight lang="nasal"> | <syntaxhighlight lang="nasal"> | ||