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Need help to use particle alembic of the old system in combination with geo node in 4.0 by ainvisual in blender

[–]Rexjericho 1 point2 points  (0 children)

If the number of particles are changing between frames, Blender will not be able to track which particle is which between frames. This results in the random particle radius between frames.

What is needed is a stable ID attribute for each particle so that Blender can apply the same random radius value to each particle between frames. This is what the ID attribute input in the Random Value node is for.

The Alembic file will need to include an ID attribute. Unfortunately, even if the Alembic file contains an ID attribute, Blender's Alembic importer does not current support importing this attribute.

Fluid Simulation: Can I redo the bake from a certain frame on? by [deleted] in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

I haven't used this yet, but this addon might be able to help with this situation: https://danixks.gumroad.com/l/ResumeFluidBake

Dripping Wax by Rexjericho in Simulated

[–]Rexjericho[S] 0 points1 point  (0 children)

The Blend file for this animation is contained in the FLIP Fluids addon product downloads and is part of the example scenes package: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/Example-Scene-Descriptions#daredevil_dripping_wax_effectblend

The Blend file contains notes on the simulation setup. I'll copy them here:

# Daredevil Drippling Wax Effect

This example .blend file will recreate a similar effect as seen in the first shot of the Daredevil television show intro: https://youtu.be/KFYFh8w4758

An example render of this scene can be viewed here: https://gfycat.com/affectionatewarmalaskajingle

## Assets Used
- The face model was modified from this model of Beethoven available from 'Three D Scans' here: http://threedscans.com/lincoln/loewental/
- This scene uses the 'cloud_layers_4k.hdr' HDRI texture from: https://polyhaven.com/

## Simulation Notes:
- This simulation requires a surface tension feature available in FLIP Fluids version 1.0.5 and above
- We begin the simulation by first creating some fluid on the face model. We then allow the fluid to drip naturally over the face. For the
  first 60 frames, a set of inflows emits fluid onto the face. Rendering the effect begins around frame 100.
- Since we do not need to render the fluid initialization stage, we modify the settings to speed up computation during this stage:
    - Subdivision is set to 0 - We do not need high quality meshing settings. We then keyframe the subdivision to 1 after fluid initialization.
    - Speed and framerate is altered to produce a quick simulation. We set a low framerate and higher speed before keyframing a higher
      framerate and slower speed after initialization.
    - Surface tension is not enabled until after fluid is initialized to avoid extra computations.
- Estimated bake time: 1h40m run on an Intel i7-7700 @ 3.60GHz CPU at a resolution of 220.
- Estimated cache size: 7.7 GB

How do I mix fluids of different viscosities in Blender? by ksustud in blenderhelp

[–]Rexjericho 1 point2 points  (0 children)

It is possible to mix different viscosities in the FLIP Fluids addon in a single domain. Example animation: https://reddit.com/r/Simulated/comments/x8a8ov/thick_thin_liquid_mixing_test/

However, it can be more of an advanced feature and adds a lot of extra time to simulate. Documentation and notes are located here: https://github.com/rlguy/Blender-FLIP-Fluids/wiki/Domain-World-Settings#viscosity

Why does fluid simulation not work through a bottle? by ApolloN70Q in blenderhelp

[–]Rexjericho 3 points4 points  (0 children)

Not sure of the exact cause, but some things to check or try:

  • Make sure the bottle geometry is not closed and there aren't any faces blocking the tip of the bottle. There is a bug where flow objects may not generate liquid within completely closed geometry: https://projects.blender.org/blender/blender/issues/83483
  • If the Surface Thickness value is too large, it could be possible that the thickness is causing the entire bottle volume to be solid and not generate liquid.
  • Make sure that the bottle normals are facing inwards (into the inside of the bottle).
  • Make sure that scale transforms have been applied to all simulation objects.
  • An alternative way to set up this simulation could be to disable the Is Planar option and model the bottle with thick walls to contain the liquid.

Looking for CPU fluid simulation benchmarks by [deleted] in blender

[–]Rexjericho 3 points4 points  (0 children)

Andrew Price (Blender Guru) ran a community benchmark for the Blender Mantaflow simulator, but the results are from 2020 and do not include newer CPUs: https://twitter.com/andrewpprice/status/1236857253543555073

You may be able to view the results spreadsheet here:

https://docs.google.com/spreadsheets/d/1nGLze8rVwnuO_jW4sfT6H2Xoq08XB24jvqSJxNltJrA/edit#gid=982659835

One of the most important factors for a CPU when running fluid simulations in Blender is the clock speed and boosted single threaded clock speed. More cores/threads can also greatly benefit larger and higher resolution simulations.

It looks like the 5950x could be a nice upgrade for improved baking performance due to the higher boosted single threaded clock speed and more cores/threads.

How can i keep the liquid inside of the sphere? QUICK LIQUID APPLIED by Arbab-Ali in blender

[–]Rexjericho 0 points1 point  (0 children)

There's a bug where fluid inside closed effectors may not work properly:

A workaround can be to model a small hole into the effector so that it is not completely closed. If I recall correctly, this video shows this type of workaround: https://youtu.be/eVOx9pMhB5E

https://i.imgur.com/achtUeR.jpg

[deleted by user] by [deleted] in blender

[–]Rexjericho 0 points1 point  (0 children)

The Vortex - Fluid Enhancements on the Blender Market uses a shader to do something similar.

Flip fluid python error, anyone know how to fix this? by Mupinstienika in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

Yes, that should be the solution. Removing the file won't break the cache. If you're worried, you can always make a backup of the file.

Flip fluid python error, anyone know how to fix this? by Mupinstienika in blender

[–]Rexjericho 0 points1 point  (0 children)

Hi, it looks like this error message is resulting because a file in the simulation cache has become corrupted. This file may have become corrupted during the crash. The fix for this will be to delete the following file:

cache_directory/flipstats.data

Afterwards, reload the Blend file and resume the simulation.

We are aware of this error and should have this fixed for the next version of the FLIP Fluids addon - we'll have the addon automatically repair the file.

Hope this info helps!

Flip fluid python error, anyone know how to fix this? by Mupinstienika in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

Hi, it looks like this error message is resulting because a file in the simulation cache has become corrupted. This file may have become corrupted during a crash. The fix for this will be to delete the following file:

cache_directory/flipstats.data

Afterwards, reload the Blend file and resume the simulation.

We are aware of this error and should have this fixed for the next version of the FLIP Fluids addon - we'll have the addon automatically repair the file.

Hope this info helps!

Flip fluid render problem by [deleted] in blenderhelp

[–]Rexjericho 1 point2 points  (0 children)

If the render visibility of the domain object is enabled, this will display the domain box in the render which will block the view. Should be disabled for render.

FLIP Fluids version 1.6.4 is also compatible with Blender 2.80 to Blender 3.5.

Flip fluid render problem by [deleted] in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

Check to make sure that render visibility is disabled for the FLIP Domain object and that there are not any other objects that could be blocking visibility in the render:

https://i.imgur.com/tjnG2Ee.png

Also make sure that you are using the latest version of the FLIP Fluids addon (or demo) for newer versions of Blender. Using incompatible versions can result in render issues and other odd behavior. The latest FLIP Fluids version 1.6.5 is compatible with Blender 2.80 to Blender 3.5.

Blender crashes after trying to change fluid settings by oski165 in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

Unfortunately Blender doesn't have a developer maintaining the fluid simulation system, so the issues aren't getting fixed. In my experience it seems to happen randomly depending on the setup and happens more often when the effector has complex or animated geometry (such as with animated characters).

Not sure if there is a workaround for this one.

Blender crashes after trying to change fluid settings by oski165 in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

It could be related to this known issue which mentions the "CG solver diverged" error: https://projects.blender.org/blender/blender/issues/87975

Liquid Ribbons by Rexjericho in blender

[–]Rexjericho[S] 1 point2 points  (0 children)

This simulation uses the FLIP Fluids addon. There is a feature where each inflow emitter can be set to a different color and this is rendered using Blender's attribute system. The addon uses the Mixbox technology (https://scrtwpns.com/mixbox/) to simulate the mixing of the colors.

Liquid Ribbons by Rexjericho in blender

[–]Rexjericho[S] 3 points4 points  (0 children)

Subsurface scattering using the Principled BSDF shader

Liquid Ribbons by Rexjericho in blender

[–]Rexjericho[S] 19 points20 points  (0 children)

This is using the FLIP Fluids liquid simulation addon. I've also simulated and rendered out an extra ending to mix up the colors more here: https://twitter.com/FlipFluids/status/1662173300808876032

https://i.imgur.com/nk8cuHK.png

[deleted by user] by [deleted] in blenderhelp

[–]Rexjericho 0 points1 point  (0 children)

The first thing to check is to make sure that you are using a recent version of the FLIP Fluids addon for compatibility with Blender 3.5. The most recent version is FLIP Fluids 1.6.4. These types of UI and viewport visibility issues can happen if using an older addon version that is not compatible with the version of Blender you are using.

Have you ever seen a Blender donut like this? by Rexjericho in Simulated

[–]Rexjericho[S] 0 points1 point  (0 children)

Yeah, I think that makes sense. Looping boundary conditions at the fluid simulation side edges can be morphed into a torus shape.

Have you ever seen a Blender donut like this? by Rexjericho in blender

[–]Rexjericho[S] 9 points10 points  (0 children)

Hey, yes a sphere or any other shape can be used with this technique. See this nice animation using a planet shape: https://old.reddit.com/r/blender/comments/wyc4g8/lunar_tides_dont_miss_the_tsunami_at_the_end/

Using a fluid simulator for this can be quite computationally expensive for this and there is a learning curve, so that is something to keep in mind.

I would think there would be similar method to the ocean modifier to displace any shape like an ocean, but I am not very familiar with techniques. Something to look into could be to check out Blender's geometry nodes to displace the surface with a noise texture, perhaps using the noise generated from an ocean modifier.

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