Questions tagged [fluid-simulation]

Questions about the Fluid simulation systems in blender. Blender has two systems for simulating liquids, a SPH (Smoothed Particle Dynamics) system integrated with the particle system, and a Lattice Boltzmann method which can be used create a variety of simulations.

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How can I make stationary lava with the fluid simulation in blender?

I am wondering how to make stationary lava with a fluid simulation in blender. I don't want it to be an object I want it to be fluid. And I also don't want it to be filling up as the animation ...
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1answer
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My fluid domain disappears and appears to turn into the fluid object when I bake

I made this scene with a fluid simulation a few days ago, but the fluid domain turned into the melt word "ICE" instead of the cube I used as the domain. Is this supposed to happen? Where is the cube ...
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1answer
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Is there a way to render particles as if they were a single liquid?

I don't want to use the fluid simulator beacuse i've been getting more controlled results with the particles system feature + using a guide as a force field. What i'm trying to accomplish is water ...
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How can I create foam and spray in a fluid simulation? [duplicate]

Hi! I'm working on simulating an ocean; after working on it for quite a while, I've come to the realization that my ocean is missing the characteristic ocean foam and spray. I saw some vids where ...
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1answer
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What is the minimum size requirement for a Fluid mesh object in a Fluid simulation?

What is the minimum size requirement for a Fluid mesh object in a Fluid simulation? I've heard and read that if the mesh is too small, it may not act like fluid properly when baking. But, I don't know ...
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Why will my fluid domain only bake once?

I'm trying recreate Ian McGlasham's "ALICE" fluid animation. In the process, I've been trying to adjust settings for the size of my fluid objects and also for the resolution of the domain object, so I ...
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1answer
220 views

What are alternative methods to Fluid for making a glass appear to be full of liquid?

What are alternative methods to Fluid for making a glass appear to be full of liquid? I just require a quick simple method. I was going to use particles but wondered if anyone had other methods or ...
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River simulation - different approaches than fluid simulation?

I am in the middle of a project which needs to have a river flowing in it. (You may be familiar with my recent questions; they are all related.) Just for reference and imagination, here's a preview of ...
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1answer
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Where is fluid bake completion time reported?

Where does Blender report on fluid simulation bake completion time?
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Fluid not filling container completely

I am using 2.70 with Cycles to recreate Ian McGlasham's "Alice Blender Fluid Cycles". However, for some reason my fluid does not fill the entire text -- for some reason it only fills part of the text:...
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1answer
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Baking fluid sim to shape keys

I've made a fluid simulation and it's working exactly how I want. I would like to save the simulation as a shape key-based animation, mostly so I can do another fluid simulation that interacts with ...
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3answers
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Make meshes simulate like water?

What I want to do is, instead of using water with water simulation, I want to make lots of cubes flow like water (like the water simulation does with the mesh). Remesh won't work, because I want to be ...
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1answer
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Mapping a texture onto a fluid

Mapping an Environment Texture onto a fluid in blender works normally, even with image sequences/animated textures, but I can't seem to figure out how to map an Image Texture onto a fluid. Really, I ...
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1answer
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How To Make A Solid Object Drop To The Ground Like It Was Liquid

So I have a simple bouncing ball animation, but I just wanted to something "weird" for the ending. Is there a way to change the ball's material on the fly, where after the last bounce it changes ...
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1answer
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How to avoid fluid appearing outside collision objects?

In fluid simulation as it is done on a grid with a resolution definable even choosing a higher value for the resolution (as in our example below, 200) it is not enough to have a realistic shape of the ...
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1answer
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Can fluid respect soft bodies (or any deformation!) in blender?

Right now, I have a render that looks something like: this. As you can see, the fluid is ignoring the soft body simulation. Is there any way I could make the fluid respect the soft body simulation?...
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1answer
993 views

Is it possible to bake fluid simulation into blend file?

Is it possible to bake a fluid simulation into a blend file, instead of a separate cache folder? The main reason is, I'm using a renderfarm to upload animation files. The renderfarm only accepts ...
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Fluid baking stops without errors

I have setup a simple scene with some hills (one big object) and dam with water. Dam consists of multiple objects, they are set up as fluid obstacles. Dam breaks (parts of dam are animated with ...
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1answer
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Is it possible to float an object on a fluid simulation?

This question is related to Physics cross-simulation interactions?. Is it possible to make an object float/interact with a fluid simulation? It doesn't have to be full two way interaction, but I ...
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How to bake multiple fluid simulations in one scene?

If we understood correctly, Blender does not allow more than one domain for fluid simulation in a given scene. This means that any inflow (fluid) object will be transformed into only one domain object ...
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1answer
356 views

Why do keyframed objects cause fluid baking to slow down so much?

In the following figures we show the results of our attempts in order to mix a key-framed animation with a fluid simulation. As you can see, in the top one the obstacle is static (fix) but in the ...
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2answers
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How to resume baking fluid simulation?

It happens sometimes that after finishing bake (e.g., for fluid simulation) we wish we could continue the simulation for two more seconds :( How to use the ...
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Water leaks through obstacle

Every time I try to hold water with a obstacle, it leaks out. Here is one example I have made. The shape has no holes, and the water is partially contained but slowly leaks out. This has occurred ...
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1answer
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How to create a continuous flow of water?

I have built a water slide and pool and I want to make a animation of the water running down the slide and into the pool. The problem is I need the water to be created at the top and go away at the ...
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1answer
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Why does fluid (water) stick to the top of an obstacle?

In our simulation, Fluid (water) drops on an obstacle and splashes. It mostly works fine, but there is noticeable part which remains on top of the obstacle! In reality, there should be no water there, ...
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3answers
4k views

Different materials for each fluid inflow?

How to assign a different color / material to each inflow object in one simulation (bake)? In the following example we tried to mix two inflows and experience the mixing between the two fluids. ...
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1answer
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How to attach colors (e.g., gradient color) to fluid particles

This is follow up question based on {this post}, indeed. The question is how to attach color attribute to fluid particles? For example when a part of colored fluid (as explained {here}) ...
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1answer
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How to apply gradient color change in an animation

How to apply color gradient change on a fluid such as in the following figure? The method should be capable to apply to all frames in the animation automatically. Consider it as simulation of being ...
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1answer
921 views

Increase quality of water render

Here is my attempt at dropping things into water. Unfortunately it did not turn to out well especially at the bottom right and this is at 900 cycles. Are there any ways apart from increasing the ...
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1answer
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Is it possible to simulate an egg?

Is it possible to simulate an egg? Specifically, I was wondering how to handle simulating the yolk. I was thinking fluid simulation, but it seems you can't a specify different viscosity for ...
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1answer
10k views

Simulate objects falling into water

On the blender website there is this image: What would I need to do to recreate this, cubes and spheres falling instead of fruit would be fine. I believe this uses the cycles render I have never used ...
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2answers
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How to simulate engines spraying a fluid?

You know an aircraft engine? The gigantic fans on the sides of the aeroplane? Well, there will be seven of those in a circle facing to where the powder comes out and it will spray a liquid onto it. ...
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1answer
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For Fluid Simulation, what do the Start, End and Speed settings mean?

How do the Start, End and Speed settings work? Isn't the Speed setting determined by the Start and End settings? For example, say I have 120 frames (at 30fps, thus 4s), and I set "Start: 0", "End: ...
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1answer
107 views

How to determine the poly/vert counts of a fluid simulation?

Is it possible to determine the vertex count of a fluid simulation frame without applying the fluid simulation? Normally I would just go into edit mode and select all to see the vertex count in the ...
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1answer
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Is it possible to create a fluid simulation of rain?

Is it possible to simulate rain with the fluid simulator? I tried to do something with a bunch of Inflow cubes that get enabled and disabled, however this is very tedious. Is there a better way? I ...
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709 views

Converting an obj sequence to a .bobj fluid sim cache?

I'm wondering if there is any way to accomplish turning an obj sequence exported from realflow into a .bobj fluid cache that I could then trick blender into loading as a native fluid sim cache. So far ...
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4answers
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Fluid simulation not baking

I am trying to bake a fluid simulation in Blender 2.67. Here is a mockup of my scene: My scene is set up just like the picture, with a sun lamp above a mesh that is supposed to be a riverbed. The ...
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2answers
451 views

text already baked before fluid simulation

I have been working with the ICE tutorial for awhile now. The issue is when I change the box to a domain the text already appears to be baked even after I create a new project. I'm sure I've screwed ...
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1answer
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Physics cross-simulation interactions?

For example, rigid bodies and fluid. I know it's kind of possible by setting the rigid bodies as fluid obstacles, but it's not "true" interaction in that the fluid does not affect the rigid bodies... ...
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4answers
9k views

Why does the water keep escaping in my fluid simulation?

I am trying to do a water simulation. I have a small cup that I have created in blender (as an obstacle) and my water source (just an oval). My domain box is large enough to encompass both the glass ...
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1answer
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Bake Fluid Simulation via CLI or Python?

I would like to run a fluid simulation on a headless Ubuntu machine I have lying around. I did manage to find a bug report on the issue but to no avail. Has anyone else had any success? Or perhaps a ...
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823 views

Why can't I have an inflow with an animated mesh output to local coordinates?

If I check Export Animated Mesh for an Inflow in fluid dynamics, I lose the option of using local coordinates. Why? What can I do about it?
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1answer
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How can you use vector blur in Cycles with fluids?

I know (at least I believe this to be true) that using cycles motion blur wont work with fluid simulations when rendering, however, I know that vector blurs can be used in place of motion blur. With ...
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2answers
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How can I make a fluid simulation in game engine

Is there a way to simulate a fluid in the game engine? It doesn't have to be 100% realistic (but not a cycling 2D animation). It just needs to be recognizable as water. Optimally, there should be a ...
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4answers
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What is the most computationally efficient way to make ripples?

I know you can use Dynamic Paint as well as Fluid Simulation with Force Fields to make ripples. I'm sure there are other ways as well. Which way is the least memory and processor intensive of these?

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