Emit from Object -> Face Center Option

[sagun-manandhar]

hi,

can't figure out how to emit particles from object from Face's Center. It emits only from Vertices.

[thnkr]

I think you may have set the Emitter Type to Directional rather than Surface under Basic Emitter Attributes in the Attribute Editor for the emitter node.

[sagun-manandhar]

yes but that will get particles in vertices only.. how to get in at the center of the faces??

[joojaa]

You dont! Or atleast not easily. Make a new object taht has points at the center of your faces by  Poking the face and setting the exiting vertices emission rate to 0.

[sagun-manandhar]

Thanks jooja, but again how can i set the existing vertices emmission rate to zero?

[sagun-manandhar]

jooja, u there?

[joojaa]

oh sorry i wasnt:

right click on the object and select dynamics -> particle -> per point emission rates

then open the attribute editor under teh object shape and expand extra attributes and type emission rates to the vertices into that list, or fill them with mel but if you can type it you ca get to see what the mel is.

[joojaa]

/* jooCCRequestedEmitFormFaceCenter.mel 0.1

Authors: Janne 'Joojaa' Ojala
Testing: if it works after a suitably long time without
much problems let me know. Report any problems.
License: Creative Commons, Attribution, Share Alike
Request by: Sagun Manandhar

About:
A simple script that will poke a polygonal mesh and
emit only from the poked vertices. script has no
sanity checks so use with care.

Install Instructions:
place this text in a file named:
jooCCRequestedEmitFormFaceCenter.mel
that resides in your personal Maya script directory.

Usage:

select any number of polygonal objects and run:
jooCCRequestedEmitFormFaceCenter
from a command line.

Changelist:
28.11.2009 - Original file
*****************************************************************/

global proc jooCCRequestedEmitFormFaceCenter(){
for ($each in ls -sl){
$points = size(ls -fl ($each+".vtx[ * ]"));
polyPoke -ws 1 -tx 0 -ty 0 -tz 0 -ch 1 $each;
$e=emitter -type omni -r 100 -sro 0 -nuv 1 -cye none
-cyi 1 -spd 1 -srn 0 -nsp 1 -tsp 0 -mxd 0
-mnd 0 -dx 1 -dy 0 -dz 0 -sp 0 $each;
$p=particle;
connectDynamic -em $e[1] $p[0];
addPP -atr "rate" $e[1];
for($i=0;$i<$points;$i++)
setAttr ($each+".emitter1RatePP["+$i+"]") 0;
}
}

[sagun-manandhar]

thanks jooja