Fetch Value At Specific Time in VEX

[jamesearnest244]

Hi,

Is there a way in VEX to get the value of an attribute at a specific time? For example, the @P.x of point 0 at frame 15? I know I can use a Time Shift node but I'm looking for a more flexible solution in VEX.

Thanks!

Edited September 30, 2021 by jamesearnest244

[Atom]

If you connect the TimeShift to the second input of the attributeWrangle node, you can fetch from it using the point function.

vector time_shifted_attrib = point(1,"my_attrib",@ptnum);

 

Note: Using python, you can evaluate a parameter channel at a certain point in time, but that's not the same as an attribute.

https://www.sidefx.com/docs/houdini/hom/hou/Parm.html

Edited September 30, 2021 by Atom

[jamesearnest244]

Thanks, I did consider the Time Shift node, but it's a little cumbersome for what I'm trying to achieve. I'd like each point to fetch the value from a different frame, and I have quite a few points. So I wanted to write some VEX that would select the delay per point based on @ptnum.

[vicvvsh]

Hi,

you can pull your animated geometry into chop with Geometry chop node. Then read a value of channels, which are point's coordinate, within a point wrangle using chop() function.

https://www.sidefx.com/docs/houdini/vex/functions/chop.html