Control DOP points ?

Forums Houdini Learning Materials Control DOP points ?

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_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 21, 2017 12:02 p.m.

If a entire mesh is created out of points from volume. How can I limit what points get effected by a DOP network and what points don't get effected by a DOP network ?

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 21, 2017 8:05 p.m.

there is many ways to do this, one way if you want to have control, just do it with color and using a transfer attribute.


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 21, 2017 10:19 p.m.

Color SOP (Attribute; “selpnt”, Color Type; ramp from attribute)

Attribute Transfer (Source Group; Points, Attributes; toggled points ‘selpnt’.

Also what are the other methods ?

Edited by _Christopher_ - Jan. 22, 2017 18:03:27

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 22, 2017 7:26 p.m.

can you post your file will be way easier to help


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 22, 2017 9:06 p.m.

Sure, scene file attached.

Attachments:
melt_start.hipnc (628.2 KB)

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 22, 2017 10:11 p.m.

Here u go

Attachments:
melt_start.hipnc (632.6 KB)


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 12:12 a.m.

Sorry, why doesn't the DOP Network evaluate. When I play the simulation the points which are red should only get effected by viscosity, shouldn't I set the attribute viscosity ?

Edited by _Christopher_ - Jan. 23, 2017 01:00:13

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 1:33 a.m.

oh I didn't even see the Dop network, but basically is the same. Add an Attribute Wrangle and add @viscosity to a value that you want and the other one to a different value, do the attribute transfer and add viscosity to it, keep the color if you want, it will be just to visualize where you are affecting the values. You can use groups as well.

f@viscosity = 10000;
v@Cd= {1,0,0};

f@viscosity = .08;
v@Cd= {1,1,1};

Edited by sepu - Jan. 23, 2017 01:42:40


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 4:39 p.m.

sepu - As such ?

Edited by _Christopher_ - Jan. 23, 2017 16:44:16

Attachments:
melt_start.hipnc (628.2 KB)

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 5:39 p.m.

Like this

Attachments:
melt_start_v2.hipnc (595.1 KB)


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 5:56 p.m.

sepu - When opening your scene, I'm getting the following errors;

Skipping unrecognized parameter “dosurfacetension”
Skipping unrecognized parameter “surfacetension”

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 6:03 p.m.

it doesnt matter is just because Im using version 15.5.673


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 6:27 p.m.

When playing the simulation after the first frame the object disappears ?

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 6:39 p.m.

what do you mean exactly that the object disappear? here is working just fine.

Edited by sepu - Jan. 23, 2017 18:45:20

Attachments:
visc.gif (1.6 MB)


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 7:03 p.m.

I select the output node in the DOP solver, hit play and the mesh disappears after the first frame. Although the flip solver has two errors, attribute V is missing and pscale is missing ?

Also how do you invert what is being effected; reverse node after or before the wrangler didn't work ?

Edited by _Christopher_ - Jan. 23, 2017 19:06:13

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 7:09 p.m.

are you using the file that I post it here??? if so it should be working just fine.

If you want to revers the effect just change the values.


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 7:57 p.m.

This file.

Attachments:
melt_start.hipnc (634.6 KB)

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 8:09 p.m.

you do not need the SOP Solver, or at least for what ask for, so disable it or delete.
You do not need the attribute created that you have there you already have the wrangle doing that (even though is gonna be overwrite it).
On the FLIP solver you need to go to Volume motion Tab and enable “viscosity by attribute”
on the flip object, physical tab put viscosity to 0 (this also will be override by the attribute wrangle, just good practice) since you are driving it by an attribute Wrangle from SOPs.

Edited by sepu - Jan. 23, 2017 22:03:53


_Christopher_: Member; 766 posts; Joined: April 2014; Online

Jan. 23, 2017 9:04 p.m.

sepu
you do not need the SOP Solver, or at least for what ask for, so disable it or delete.
You do not need the attribute created that you have there you already have the wrangle doing that.
On the FLIP solver you need to go to Volume motion Tab and enable “viscosity by attribute”
on the flip object, physical tab put viscosity to 0 since you are driving it by an attribute Wrangle from SOPs.

It worked.

By passing the SOP solver was the solution. Adam Swaab taught me to use the SOP Solver

What would be the method used following what Adam Swaab teaches and omitting the wrangler node; but using the SOP Solver ?

Another question; can I apply an ease to the points, right now it's an abrupt amount of points not being effected by DOPS, how can I have some gradation ?

Edited by _Christopher_ - Jan. 23, 2017 21:09:57

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sepu: Member; 419 posts; Joined: Feb. 2012; Online

Jan. 23, 2017 10 p.m.

Im not sure what, how or in what context Adam is using the Sop Solver.

To get some gradation go to the attribute transfer and can play with “Distance Threshold” and the “Blend width”;
Also you make the viscosity less.

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