I have a curve with a few points, (group1)
I resample the curve using the resample by polygon edge setting and a fixed distance between points, (group2)

I would now like to delete those points which were in the original curve.
Since each line section of the curve may be a different length, there doesn't seem to be an expression I can use to group and delete these points.

Please someone tell me how can I delete the points from group2 which are also in group1? I can't figure how to do this with the delete, group or blast nodes but I feel I'm overlooking something simple..

thanks all!

normally you'd use the group logic on the combine tab to say ‘group2 != group1’.

As you've found though, the resample blows away your groups, so that's no good.

Here's an alternative method. create an attribute with a pointwrangle, ‘@deleteme=1’. Run the resample, another wrangle, ‘@deleteme=0’.

Add an attribtransfer, and transfer the pre-resample deleteme with a short falloff to the post-resample.

You can then blast based on @deleteme==1.

or you can just use attribwrangle:
if (nearpoint(1, @P, 0.0) != -1) removepoint(0, @ptnum);
plug resampled to first input and original to second

nice!

Ahh thanks both! That's perfect!
I came close to your method mestela but got confused when the resample copied my attribute to all the new points and missed the all important attribtransfer step!

Tamte> wow. That's truly elegant!