Keeping particle alignment when velocity hits 0.

[Mdonovan]

Hey Guys,

I am working on my vector rotations with vops and wrangles ... I have a particle launcher that aligns the particles normal with velocity vector of the particle. The problem I am having is that the particle is flpping when it stops. 

Here is a test .hip.

Thanks

 

 

c_launch_3.hip

Edited June 30, 2017 by Mdonovan

[Mdonovan]

Here is the wrangle code I am using to align the normals...

if (@speed > 5)

{@N = -@v;

v@lastalign = @N;

i@stopped = false;

}

 

if (@speed <= 5){

i@stopped = true;

@N = @lastalign;

}

 

For some reason the normal is still getting set to 0,0,0 even though I am setting it only if the speed of the particle is above 5. It just occurred to me that maybe I should be doing this inside my popnet ?

[Mdonovan]

42 minutes ago, Mdonovan said:

Here is the wrangle code I am using to align the normals...

if (@speed > 5)

{@N = -@v;

v@lastalign = @N;

i@stopped = false;

}

 

if (@speed <= 5){

i@stopped = true;

@N = @lastalign;

}

 

For some reason the normal is still getting set to 0,0,0 even though I am setting it only if the speed of the particle is above 5. It just occurred to me that maybe I should be doing this inside my popnet ?

That fixed it ... I am doing my alignment inside the popnet and the normal is staying fixed at speed of 0.

Edited July 5, 2017 by Mdonovan

[andre steyn]

Hi Mdonovan.

do you by any chance still have the fixed hip file to your problem?

I am playing around with the exact same thing.

I am actually a compositor still new at Houdini.