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Vellum Playground - 10 - Mixing Vellum Fluids - Part 3: Bubbles Simulation (Patreon)

Published:
2023-04-24 07:10:36
Imported:
2026-06
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  • GIM - Vellum Playground - 10 Mixing Vellum Fluids.zip

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Content

In the third part of episode ten, we'll be introducing bubbles to our fluid simulation. To achieve this, we'll be utilizing a straightforward and adaptable POP configuration that will enable us to generate bubble particles from the fluid simulation we've already created. 


Content

00:00 - Select random particles by a threshold using VEX

05:00 - Particle bubble simulation using POPs

08:48 - Filter particles based on the distance to the fluid volume

13:04 - Add geometry to the bubble simulation 

16:00 - Adjust the scale of the bubbles

17:05 - Prepare the bubble's geometry for rendering

Files

Previews only

Comments

Anonymous

Hi, Thanks for the course. Just a quick question. When you are getting "AttributeFromVolume", separating the bubbles within the fluid to those outside, can you explain the value given to the 3 Cd values (Cd.x/y/z)? In the Geo Spreadsheet it looks as if it's going from -0.018 to 0.018. Is there a reason we couldn't change this ramp, so for instance centre of the fluid is -1 and a point of infinity outside of fluid is 1, and 0 is the boundary? I'm struggling to see where the logic is being derived from. Thanks in advance!

graphicinmotion
>>109258256

The Attribute from Volume node is measuring a distance to the surface of the volume. 0 means it´s exactly on the surface, minus values are inside and plus values outside. The values are determined by the size of the SDF. If you change the Half-Band Voxels on the VDB from Particle node, you will get different values, because these specify the size of the distance field. You can remap the value in the Attribute from Volume node under Mapping.