# Expression ?

**URL:** https://forum.highend3d.com/t/expression/3375
**Category:** Maya
**Tags:** mel
**Created:** [January 20, 2006, 3:21am UTC](https://forum.highend3d.com/t/expression/3375 "2006-01-20T03:21:23Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![hjq](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/h/9dc877/32.png) [@hjq](https://forum.highend3d.com/u/hjq)
#### Post date: [January 20, 2006, 3:21am UTC](https://forum.highend3d.com/t/expression/3375/1 "2006-01-20T03:21:23Z")

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[font=Arial Black]  
hi all;  
i am not be understood about that the different between "runtime before dynamic " and "runtime after dynamic ".  
would you make some examples for me ?  
thank you for viewing ..  
)[size=2]

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### Author: ![kurianos3d](https://forum.highend3d.com/user_avatar/forum.highend3d.com/kurianos3d/32/55947_2.png) [@kurianos3d](https://forum.highend3d.com/u/kurianos3d)
#### Post date: [January 20, 2006, 9:53am UTC](https://forum.highend3d.com/t/expression/3375/2 "2006-01-20T09:53:12Z")

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QUOTE(hjq @ 01/19/06, 07:21 PM) [snapback]225561[/snapback]  
[b][font=Arial Black][/b]  
hi all;  
i am not be understood about that the different between "runtime before dynamic " and "runtime after dynamic ".  
would you make some examples for me ?  
thank you for viewing ..  
)[size=2]

Hi

runtime before dynamic is it will calculate your expressions ans script before genarating each particle

and one more thing is there when ur dynamic movments or dynamic values is get started over i mea ngravity or valocity liek then there expression will strt.

runtime after dynamic is it will calculate your expressions ans script after genarating each particle

and one more thing is there when ur dynamic movments or dynamic values is get stoped or over i mea gravity or valocity liek then there expression will strt.

creation is it will claculate ur expression ans script whn the particle is get created

for eg:

try this expression to youe expression editor

CODE  
particleShape1.radiusPP=rand(0,0.5)

more help you can get from

Getting Started with Maya

> Expressions
> 
> Lesson 3: Controlling particle attributes

regds

o.S.k

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### Author: ![hjq](https://forum.highend3d.com/letter_avatar_proxy/v4/letter/h/9dc877/32.png) [@hjq](https://forum.highend3d.com/u/hjq)
#### Post date: [January 21, 2006, 4:09am UTC](https://forum.highend3d.com/t/expression/3375/3 "2006-01-21T04:09:19Z")

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thank u )  
 very much