Jia-Lin Zhou

for someone who may have the same question
the solution is to check the Use VEX and then simply type in "wind = @N"

seriously some of the parameters are so ambiguous for accessing them,
if you try to copy & paste the relative parameters like Wind Velocity and Air Resistance,
you'll only get the value instead of the reference.

https://www.sidefx.com/docs/houdini/nodes/dop/popwind.html [www.sidefx.com]

even if it's difficult to maintain and provide the samples of the usage for each nodes,
the documents could at least shows up all the local variables name.

Hi I'm trying to simulate a simple wind environment with Popwind,
the pop works fine with any number input for velocity,

but when I tried to multiply it with local variables like $NX and $NZ
I didn't get the result I was hoping for.

Please help me if there something I was missing.

thanks in advance :]

jsmack
looks like its working to me. You need to render it with mantra or karma or some other renderer to see it correctly. the opengl view is just so you can vaguely see something while you work. alpha compositing doesn't work how you expect it the scene viewer. Partial alpha makes the color blend with the background, not accumulate with other geometry.

Hi jsmack, thanks for your explanation,
I'll try getting the correct result on rendering then :]