llCloud

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Cloud

llCloud

Summary

Function: float llCloud( vector offset );

43	Function ID
0.0	Forced Delay
10.0	Energy

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

• vector

offset

Caveats

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Examples

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: nabla dot v = 0

This condition is satisfied whenever v has a vector potential, because if v = nabla times A then nabla dot v = nabla dot (nabla times A) = 0.

Deep Notes

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Signature
function float llCloud( vector offset );