Selecting edges of fluid particles

[younglegend]

Hi all, im doing a lava flow project and  im looking for a way to just isolate the edges of my flip sim (only the sides and front edges). Ill be using these edges as a source for my steam/smoke/fire. Btw using distance from centroid, bbox, attribute transfer, gradient ramp din give good results. lil help pls. Thanks.

[Sean-R]

You can convert the fluid mesh to a SDF and perform a volume sample. In the file attached I have set up a Point VOP to compare the points to a Sampled volume, if the points are a minimum threshold then they are red.

 

Hope this helps!

isolateBoundaryEdge.hipnc

[younglegend]

Great one! But its giving me the whole border, where i need only the edges. Meaning not the points in the middle.  Anyway thanks for the help! ill figure it out. Anymore trick up your sleeves?

Edited May 4, 2016 by kishenpj

[sebkaine]

your FLIP looks to propagate on a floor ? if that is the case

- i would take your flip assign @Cd = {1,1,1}

- create a very detail grid for your floor assign @Cd = {0,0,0}

- attribute transfer @Cd with distance at 0.01 fallof pretty small like 1.0 so that it leaks out of your flip

- then do an attribute transfer at 0.01 without the fallof (0.0

- substract the 2 and you get the edge of your stuff

 

 

test.hiplc

Edited May 4, 2016 by sebkaine

[younglegend]

On 2016-05-04 at 1:03 PM, sebkaine said:

your FLIP looks to propagate on a floor ? if that is the case

- i would take your flip assign @Cd = {1,1,1}

- create a very detail grid for your floor assign @Cd = {0,0,0}

- attribute transfer @Cd with distance at 0.01 fallof pretty small like 1.0 so that it leaks out of your flip

- then do an attribute transfer at 0.01 without the fallof (0.0

- substract the 2 and you get the edge of your stuff

 

 

test.hiplc

Oh yes, that's the first thing i did, did not give what i needed. And yes, it flows on an uneven floor, but there is uneven walls on both sides. Uneven in the sense low frequency noise. A cave, you can say.

[sebkaine]

I have use the vdb curvature and it is better imo !

let me know if it's good enough

Cheers 

E

test_02.hiplc

[younglegend]

16 minutes ago, sebkaine said:

I have use the vdb curvature and it is better imo !

let me know if it's good enough

Cheers 

E

test_02.hiplc

Awesome! Still needs some tweaks...but its more than enough to use. Thanks tons!