How can I freez only ParticleShape.Position X and Z in Maya

[Aikiman]

You can control a particle position using this expression....

vector $pos = position;
position = <<$pos.x, $pos.y+sin(time), $pos.z>>;

this will hold your particle's birth position and animate it's y attribute using sin of time.

[rkom]

You can control a particle position using this expression....

vector $pos = position;
position = <<$pos.x, $pos.y+sin(time), $pos.z>>;

this will hold your particle's birth position and animate it's y attribute using sin of time.

thank you for example

but when nurbs ball moving to particles ( nurbs ball was collide object ) any particles still move to anywhere ( X, Y, & Z axis ).
Really, I would like every particles don't moving along X and Y axis after collided .

have any expression else?

thank a lot and pardon me English language.

[Aikiman]

Try this where the particles only move in the Y direction after collisions.
Create a custom particle per particle vector attribute called "originalPos" then add these dynExpressions...

// Creation expression
particleShape1.originalPos = particleShape1.position;

// Runtime expression
vector $origPos = particleShape1.originalPos;
vector $pos = particleShape1.position;
if (($pos.x != $origPos.x) || ($pos.z != $origPos.z))
particleShape1.position = << $origPos.x, $pos.y, $origPos.z>>;

Basically all you are doing is creating a custom attribute that will hold the original position and if the position in x or z changes, then make the particle return to the original position.

[rkom]

Try this where the particles only move in the Y direction after collisions.
Create a custom particle per particle vector attribute called "originalPos" then add these dynExpressions...

// Creation expression
particleShape1.originalPos = particleShape1.position;

// Runtime expression
vector $origPos = particleShape1.originalPos;
vector $pos = particleShape1.position;
if (($pos.x != $origPos.x) || ($pos.z != $origPos.z))
particleShape1.position = << $origPos.x, $pos.y, $origPos.z>>;

Basically all you are doing is creating a custom attribute that will hold the original position and if the position in x or z changes, then make the particle return to the original position.

Oh Great !
I just modified this expression a liitle bit, then it's work fine.

Thank a lot

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