Why does 'addpoint' work in a Volume Vop but not a Volume Wrangle?

[richard_mcd_green]

In a volumevop I can generate as many points as I want, either using the 'add point' vop node or using 'addpoint()' in a snippet. However, using 'addpoint()' in a volumewrangle results in no points. I'm wondering, what's the reason for the difference in behaviour? I'm guessing there's something I don't understand about how the two work.

Edited Saturday at 06:01 PM by richard_mcd_green

[Alain2131]

It works when you do some operation on the volume.
Simply adding @density = @density; is enough.

addpoint(0, @P);
@density = @density; // Telling Houdini that it should care about this volume

My guess is that the wrangle skips processing any volume that isn't referenced ?
I would be curious to learn about the intricacies, if someone knows.

Edited 22 hours ago by Alain2131

[richard_mcd_green]

12 hours ago, Alain2131 said:

It works when you do some operation on the volume.
Simply adding @density = @density; is enough.

addpoint(0, @P);
@density = @density; // Telling Houdini that it should care about this volume

My guess is that the wrangle skips processing any volume that isn't referenced ?
I would be curious to learn about the intricacies, if someone knows.

That's fascinating, never would have thought to try it but now I think about it, vops does have density plugged into density out by default! Thanks!