POP group based on VEX expression

Forums Houdini Indie and Apprentice POP group based on VEX expression

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maxbel: Member; 36 posts; Joined: Jan. 2014; Offline

Nov. 10, 2014 6:04 p.m.

Hi,

I'm trying to create a popgroup based on if the my particles are affected by the popfan.

I'm very new to VEX and Houdini so I don't know which attributes I can use in the VEX expression.

Any help would be greatly appreciated!

Attachments:
rain.hipnc (296.9 KB)


PradeepBarua: Member; 443 posts; Joined: Sept. 2012; Offline

Nov. 25, 2014 8:50 a.m.

By default popdop forces doesn't add any data to filter affected particles as other dop forces get added in Forces data which can be used to do stuff like grouping.

You need to modify “POP Fan Cone” dop otl.


PradeepBarua: Member; 443 posts; Joined: Sept. 2012; Offline

Nov. 25, 2014 8:50 a.m.

Here is your modified file:

Attachments:
rain_192.hipnc (373.3 KB)


PradeepBarua: Member; 443 posts; Joined: Sept. 2012; Offline

Nov. 25, 2014 8:55 a.m.

You are grouping based on hitnum:
if (i@hitnum>0)
{
ingroup = 1;
}
This can be also written as:
ingroup = i@hitnum>0;

It's just short form.

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