Custom Particle Attribute Access In Sop

[pclaes]

Hi,

I have been trying to transfer a custom attribute from pops so I can use it inside sops but I have not been succesful so far.

1) How can I transfer this attribute?

Specific example:

I have a particle system, the particles are randomly moving upwards, then back down to 0.

I've added a custom attribute called "hypos" (highest y position) to calculate the highest $TY value that is reached by each particle. I want to use this highest value in Sops. This value should not be static, because if the particles go up higher, the highest point will change and I want the Sops to update accordingly.

I have read that I should be able to have access to this variable downstream from the point of creation.

2) Is this custom attribute that I added in pops local to the pop context?

3) How can I have access to this variable

I have tried accessing it in Sops using $HYPOS1 but that did not work, I have also tried $HYPOSX, did not work. I then tried getting just one value of one point out of the particle system using point("../popnet1", 12, "hypos", 0), did not work.

Does anybody know how to transfer these values?

[aracid]

that should work in theory,

take a look at the file, that uses the point expression to extract a custom particle attrib.

customVar.hip

[TheUsualAlex]

hope this helpd

EDIT: aah. looks like aracid beats me to it.

plim_heighestAttrib_example.hip

[pclaes]

Thanks for the quick replies guys!

It is working now.

This was a crucial part of my network, it enables my textures to be switched at the right time.

This is why I needed it for:

http://www.peterclaes.be/temp/houdini_stuf..._o_full_res.avi

This was another initial test:

http://www.peterclaes.be/video/pca_0029.avi

For the rotation I was able to stay at pop level, but for the switching of the textures I needed to get that point expression working.

Thanks again for the examples!

[rdg]

This is why I needed it for:

Looks funny!

Georg