LlCloud

Function: float llCloud( vector offset );

Returns a float that is the cloud density at the object position + offset
• vector offset

Examples

default {

   touch_start(integer num)
   {
       llSay(0,"Cloud density:" + (string)llCloud(ZERO_VECTOR));
   }

} </source>

Notes
How clouds work:
• SL features a cellular automata-based weather system.
• There are 16x16 square cloud "cells" per sim (which means each is 16x16m in size).
• The cloud density data is sent from the server to the client once every time the agent connects to a simulator via logging in or teleporting into a simulator.
• The client attempts to render clouds from the cloud algorithm results sent from the server, which is why different clients can see different cloud formations and de-synchronizes cloud view from the server over time.
• The Z value in the vector is irrelevant (clouds are always between about 180-200m absolute height).
• It returns a value between 0.0 and 1.0, with 0.0 being no clouds, and 1.0 very dense clouds.
• Values returned above 1.0 - 2.0 indicate rainfall, but the option for rain is not currently implemented so values are capped at 1.0.
• Clouds and wind are related.

The cloud seed/growth/dissipation algorithm uses a solenoidal vector field, which
is a vector field with zero-divergence: ∇ · v = 0

This condition is satisfied whenever v has a vector potential A, because
if v = ∇ ⨯ A then ∇ · v = ∇ · (∇ ⨯ A) = 0

See Also
Functions
• llWind
• llGetSunDirection