blast by particle ID

[evanrudefx]

Hello!

How can I delete by particle ID in a blast/delete sop? It seems like it would just be $ID == 2 to delete particle with ID 2, or something like that. Nothing I tried worked : (

thanks

[3dome]

in the 'group' parameter of the blast SOP it would be @id=1 (or @id==1, both work). Don't specify the attrib type (i@, f@),.. Also important to set the group type so it knows where to look for that attrib!

In the delete SOP I don't know because I rarely use it..

 

EDIT: in the delete sop same thing, set to points, delete by expression then use a proper expression (coding) syntax with the == operator. Again, don't specify the type

Edited November 9, 2018 by 3dome
checked out delete sop

[evanrudefx]

I tried @id == 1 and it doesn't work. I set the group type to point. Why would  "@" work? I thought that was used for vex. 

[3dome]

right, I forgot to mention: NO SPACES

well, a while ago you had to use that $ sign for all that which was annoying because you had to create a variable mapping for all the attribs you created. (i think you still can do that)
but as Houdini progressed, they opted to push everyone in the direction of VEX and allowed the @ outside of VEX for stuff like that

Edited November 9, 2018 by 3dome

[evanrudefx]

2 minutes ago, 3dome said:

right, I forgot to mention: NO SPACES

It works now! How would I know to use @? I didn't find anywhere in the documentation that talks about using @ where hscript is used.