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sonppw

gas build collision mask

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hello !

 

i want to know about gas build collision mask node

i already knew that created collision, vel, index field where affector objects overlap with the fluid field

my hip file is being unoverlap anything

and box set to affector object

but hip file is ignore affector object overlaping with the fluid field also create collision field(SDF) by fullsize

 

i guess i don't understand it or error?

collisionmask.hipnc

Edited by sonppw

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i can solve problem

turn on invert iso in scalar field visualization

but why i should turn on it?

accroding help file

collision field created by

Each voxel of this field is the distance to the closest affector object. If it is inside an affector object, it is the negative distance to the surface.

so in my head is affector object inside value is negative that represent SDF

why i should turn on invert iso??

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There is no error here, historically collision field equals to inverted SDF. I also noticed that your box has negative Y size, this leads to incorrect behavior

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