Creating mask, matte, from animated geo?

[terencemace]

Good morning,

I'm trying to find a way to create a mask, or black and white matte, of my subdivided, transformed geo. (see attached.)

As the falloff is animated, I need to be able to create a matte so anything transformed and subdivided is white, and the unchanged grid is black. 

Thank you for any ideas!

T

[flcc]

Hi terence

- You say "a mask of my subdivided, transformed geo", but In your sketch you show white area on non subdivided area.
- You say matte, are you after a bitmap mask for some post processing ?
- You have already a falloff . probably a solution here, but without take a look at your file difficult to say.

A file and some infos will help people to help you.

 

[Librarian]

@terencemace Some useful stuff. Maybe it Helps! Just Combine .
Hope that you can open those files .
 

Masks and attribf.hiplc

and this vex can make some nice stuff
 

vector inf_pos = point(1,"P",0);
float radius = chf("rad");
int handle = pcopen(0,"P",inf_pos,radius,chi("maxP"));
int ptnum = -1;
float distance= 0.0;
while(pciterate(handle))
{
    pcimport(0,"point:number",ptnum);
    pcimport(0,"point:distance",distance);
    if(distance > radius- chf("trash"))
    {
        vector pos = point(0,"P",ptnum);
        vector dir = normalize(pos -inf_pos);
        setpointattrib(0,"P",ptnum,pos+dir *chf("pushdist"));
        setpointattrib(0,"Cd",ptnum,{1,1,0});
    }
    else
    {
        setpointattrib(0,"Cd",ptnum,{0,0,1});
    }
    
}

 

Edited January 15, 2022 by Librarian

[terencemace]

Thanks guys, I'll take a look. Cheers.