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samel

11-22-2006, 02:53 PM

Hi.. i have some particles moving along a surface with a noise function..
is there any way to retrieve a direction vector..

like this:

http://i14.photobucket.com/albums/a303/le_bonbon/direction_vector_help.jpg

i guess you need to do some kind of comparison between frames to get it's travelling
direction..? some cross product action going on?
a little help please.. i suck at this :D

thanks
//s

tbaypaul

11-22-2006, 06:38 PM

the average direction vector would simply be the difference between where it will be at time t + n and where it is at t. You select the n and per particle position will give you positons...

sunit

11-23-2006, 03:21 AM

velocity will give you the directional speed (speed & direction).

vector $vel = velocity;

normalizing/unitizing velocity:

unit(velocity)

will give you the same direction vector, just with a length of 1.

-sunit

samel

11-24-2006, 09:34 AM

thanks..

yup, the velocity attribute was the way to go..

//s

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