Aim paticle instances out from surface.

[Pyrokinesis]

I am confused as to what direction you want the instances to face, but here is how to address the problem.

First make sure when you create your instance that the geometry is facing positive X. after creation you can access many useful attributes under the particle shape node < Instancer (Geometry replacement).

under rotation options you should find what you need, if not you can create a custom PP attr, and connect it in this menu.

[Aikiman]

I think this thread might be helpful for you...

http://forums.cgsociety.org/showthread.php?t=399170

I've been trying to get my head around it as well but still confused. I will be back for it again sometime soon, maybe you could shed some light when you achieve it :)

[Fronat]

i looked on that thread many times and it helped my a lot.

all my particles are how pointing out from the surface.
the only thing i cant figure out is how to rotate each particle around its aimAxix (normal)
so its follows the V direction of the surface...
how its set to <<1,0,0>>.
i think it a simple thing to do but im a little confused on wich attributes to use.
i think i have to get and use the U-V tangenst fron the "pointOnSufaceInfo" node in some way.
But im indeed confused.

here is my exressions as it is for now.

______________________________________________________
float $pos[] = particleShape1.position;
setAttr "closestPointOnSurface1.inPosition" -type double3 $pos[0] $pos[1] $pos[2];
vector $normal = `getAttr pointOnSurfaceInfo1.normal`;

particleShape1.aimDirPP = $normal;
vector $aimAxisPP = <<1,0,0>>;
particleShape1.aimAxisPP = $aimAxisP
______________________________________________________

take a look att the image of my test to se whati mean.

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