Is there any sop that I can work out the distance between 2 pts.
e.g. I want to do an animation about the plant and the sun. The closer the sun is located to the plant , the sooner the plant is going to die. This means I need to find out the distance between the sun and the plant. Then I will use the chf expression to define how many frame that I need to do the “frame delay”. Am I right?

Please show me how?

did you check out the otl videos at SESI? one is about making a distance tool

have you got the link of SESI that I can follow?
thanks!

http://www.vislab.usyd.edu.au/sidefx/houdini_video/by_topic/general/index.html [vislab.usyd.edu.au]

First one

Also check exhelp distance (simplest)

chf or a lag chop if you like