Osgridadmin: /* Function: float llCloud( vector offset ); */

2017-12-30T16:18:29Z

Function: float llCloud( vector offset );

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==Function: float llCloud( vector offset );==
Returns a float that is the cloud density at the object position + offset 
• vector offset 
'''Examples''' 
{|border="1" cellpadding="5" cellspacing="0"
|<source lang="lsl">
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]]

LlCloud - Revision history

Osgridadmin: /* Function: float llCloud( vector offset ); */