Single particle moving across surface.

[Sanctuary]

can you post the scene ?

[mattswilson]

Hey,
in the scene, I just did a quick script to attach the initial particle to the object and slide it down. I threw a parameter in for U sliding too but didn't bother normalizing it to the start position in UV, so you will see it skip. I told the particle not to move in UV until a given age(2 seconds) so when the animation starts you see the particle in its birth position(Just created with the make particle tool), then it jumps to its start position (its initial goal PP), waits and then moves on its way. Oh, there is also a particle stream beign emitted by the base particle, there is a line for its emission in the script too ("trail.rate").


here's the simple expression:

seedShape.goalV = 1;
seedShape.goalU = 1;
float $U = seedShape.goalU;
float $V = seedShape.goalV;
float $startTime = 2;
float $Nm;

if (seedShape.age > $startTime){
$U = 1 - linstep(0,1,((seedShape.age - $startTime)/10));
$Nm = $V + (sin(time) / 10);
trail.rate = 10;
}else{
$Nm = 1;
trail.rate = 0;
}


seedShape.goalV = $Nm;
seedShape.goalU = $U;

float $gpp;
if (seedShape.goalU < .2){
$gpp = 1 - linstep(0,1,seedShape.age);
}else{
$gpp = 1;
}
seedShape.goalPP = $gpp;

if (seedShape.goalPP < .1){
trail.rate = 0;
}

and a movie example:
drip example movie (http://www.velatura.com/Warped/dripexample.mov)

[Ranjan1980]

Siddu You can draw a curve on surface. Create a Omni emitter . Attach the emitter on the curve as motion path . For the particles use OpacittyPP. So it will fade Out. U will feel like particle is moving on the surface.

[siddu9000]

awesome, thanks for all your replies.Gonna try it out now.

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