Hi

i have a pop network and after the hit of the particle with a surface(popattrackt and popcollisiondetect by id ) i want that the point with the same id on the surface changes its attribute - but somehow i dont get it working by vex:


1 -> the secondary context geometry
“shown” -> the attribute i want to change - to one

did i do something wrong
or isnt that even possible
or do i have to reference the surface geometry after the merge with the pop network?

Thanky for help!

isn't it the first geometry the one which is passed trough?

simple example…
could be done smarter…

but maybe you're looking for attribute transfer
to tranfer the “hit” from the particle to the surface,
then the collision surface id is not the particle id.

to do this, you need “attribute transfer” node.

oh nice point() solved the problem Thank you

matthias_k
simple example…
could be done smarter…

but maybe you're looking for attribute transfer
to tranfer the “hit” from the particle to the surface,
then the collision surface id is not the particle id.

to do this, you need “attribute transfer” node.

but is it possible to get all points by another attribute - and then by another ….
in vex - something like:

allpointsbyattribute = getallpointsbyattribute(points, attributename, attributevalue);
allpointsofpointsbyattribute = getallpointsbyattribute(allpointsbyattribute, attributename2, attributevalue2);

You can loop over arrays or maybe use groups …
I don't know what result do you need.

you can use findattribval() and findattribvalcount() to get all (or some of the) points with exact value of some attribute like id or name

or specifically for those 2 there are functions idtopoint() and nametopoint() to get the first point with the matching value of id or name attrib