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Questions tagged [physics]

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Questions pertaining to Blender's internal physics or the Game Engine physics.

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Objects with rigidbody physics slowly vibrate/rotate (Blender v 2.9)

I am trying to animate a simple scene in which apples fall from above into a bowl. I added rigidbody physics to the bowl, made it passive, set the collision to mesh, and set the margin to 0.01. I ...
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Setting multiple gravity

I have a war tank freezing in the air and one feather next to the tank, when I press the play I want the tank to reach the ground faster. Even when the weight differ they will reach the ground at the ...
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1answer
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How to simulate static vs kinetic friction?

Rigid Body simulation allows setting bounciness and friction. Is there any simple way to set friction and bounciness to match ...
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Cold smoke simulation

I want to create a cold smoke simulation to make a ghost-like object. I want the smoke to be flowing downwards, similar to the one in this video: https://www.youtube.com/watch?v=d8V16BFxGNs&list=...
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Bugs with Animation of tank. Blender 2.83 stl

Well, I'm trying to do a tank like in this tutorial :https://youtu.be/q5fjslhomsI 1.There are often bugs with metric system. It just doesn't work properly that good! C'mon I have to make stiffness ...
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How do to use just edges as Compound Parent?

2.91 introduced a new collider shape called 'Compound Parent'. If I'm not mistaken the main idea is to have a low poly parent which acts as collider instead of the high poly child while calculating ...
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blender 2.91 how to export vdb sequences

on blender 2.91, mesh to volume: OK and good But after? Is it possible to export the vdb sequence? Thanks, daniel
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1answer
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I would like to simulate spiky ocean waves from an old animated cartoon

Recently I watched a German movie called Käpt'n Blaubär: Der Film. I loved this movie as a child and when I re-watched it I was really impressed with the wave physics. They are unrealistic and over ...
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Why is my mantaflow liquid/fluid exploding?

I am making a liquid simulation with mantaflow in blender 2.82. For some reason my liquid keeps exploding after sometime. I used different resolutions, lowered the inflow, expanded the domain to try ...
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Best way to export a fluid/water animation to be used for WebVR?

Pretty new to Blender. I'd like to create a water animation to be used on a WebVR site using the Aframe framework. All the tutorials I've come across only suggest using the physics fluid simulator to ...
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Blender Mantaflow: Meaning of Liquid Particle Colors

Can someone explain me the difference between the particle colors in mantaflow. I have a simulation where some water is dripping down. The first part of the animation is going fine, until some green ...
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1answer
29 views

What might be wrong with ball and chain physics here (chain works but the ball detached with similar settings)?

I'm trying to figure out Blender 2.90 failing to apply rigid body physics to ball and chain. Here's a middle of animation for the problematic case: The screenshot shows that the ball has Rigid Body ...
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1answer
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Is there a way to get the shrinkwrap constraint to move the target to the object rather than the reverse?

In the image below there's a cuboid that has a shrinkwrap constraint to a distorted cylinder. As I rotate the distorted cylinder in the x-axis, the cuboid moves up and down following the uneven ...
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Blender Alembic export for keyshot

I am trying to export a small physics sim from blender, to open in keyshot. I am exporting the files as Alembic but in Keyshot, none of the animations are taking place, ive tried baking the animation, ...
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1answer
69 views

EXR output units

I am using Cycles to render a scene and saving the output in linear format to an EXR file. If lamp units are Watts (or W/m2 for the sun), what are the units of the value of a given pixel? Edit To ...
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3answers
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How to recreate the spaghettification process around blackhole in blender?

I have been using blender from about a year and working on Blender for 3d Scientific Animations. I am very much fascinated about how NASA and ESO create because of animations of Astronomy. Can they be ...
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Bake to keyframes not recoding any frames

I have simulated cell fracture from frame 600 so i have set regid body frame start form 600 to 700 everything is working fine. When i try to bake the physics to keyframes nothing happens the button is ...
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2answers
29 views

Physics sim - Progressively destroy bridge

I'm attempting to destroy a bridge progressively and have cell fractured a mesh that is 80m long and then smashed through it with a cube (both are rigid bodies). All the cells in the fractured mesh ...
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1answer
24 views

Keyframed Objects Clipping Through Each Other

I am very new to Blender and have made a scene where a mannequin (animated and downloaded from mixamo) is falling through a tunnel. A basic falling animation has been applied to the mannequin via ...
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2answers
809 views

How to let grow PingPong balls inside an invisible box?

Inspiration / Reference So I came by this interesting example of ping pong balls from Alvaro Navarro, where the amount of spheres are growing inside an invisible box. So I think he is using some kind ...
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1answer
31 views

Conveyor belt object fall through problem

I watched a tutorial video and tried to learn how to make a conveyor belt. Everything went well until I put a cube on the belt. Somehow, the cube just fell through the belt. I googled a lot even ...
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1answer
17 views

Active dynamic rigid body object does not move since linked to armature

i have tried everything and it does not move as an dynamic active object. clear parent does not help. it has an "child of" object constraint: There is no passive object. at least not yet. ...
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Fluids repelling away when hitting moving effector

Using 2.9 After a few hours of playing with every fluid setting trying to figure out why the fluid just sprayed everywhere when it hit the effector, it obviously ended up being the last thing I ...
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Cannot see Smoke Domain in Viewport

So, I cannot see my smoke domain in the viewport or when the scene renders when I have the cache type set to 'modular'. The scene works well when the type is set to 'replay', but I am still confused ...
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Disable atmospheric drag in smoke simulator?

I know this is a stretch, but using the smoke simulator, I'd like to simulate a gas moving through a vacuum (space) which means that the gas should not be slowed down over time and should retain its ...
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How to reload ocean bake from the cache folder

I had baked an ocean and thought that it would stay baked while I worked on the other parts of my project. Last night I tried to save blender and close it but it froze and stopped responding but I ...
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How to get my two objects move natural (trebuchet)?

so I've been working on two types of trebuchet. Following youtube tutorials got me this far: 1 trebuchet is working with a spoon at the end, but the launching object keep falling of even before it ...
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1answer
20 views

Fill Letters converted to Mesh objects with top faces removed with objects

I am using Blender 2.90.0 on OS X Catalina I would like to fill up glass letters (letter object converted to mesh) with objects (actually spheres, but used a cube to test. I removed the top faces to ...
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20 views

can I have a fluid react to a rigid body?

I was messing around in blender and made a small course where a box drops onto a ramp and slides down in and then it hits a ground plane and hits some water, but I can't get the water to react to the ...
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1answer
15 views

Gravity simulation doesn't work (Cloth Simulation)

my object isn't falling down in the cloth simulation I run. I didn't found any solution on the internet. I'm sure it's a simple one tho... Thanks in advance, Tobi
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dynamic paint canvas waves in viewport is different in render

I have a blender scene and there is a dynamic paint simulation with objects going into water however the thing is that in the viewport the fluid simulation spreads out fully and good however in the ...
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1answer
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Absolute lost at words for how to describe this softbody/fluid?

I recently saw a video THE VIDEO It's of a softbody(i think) cow getting mashed up and broke apart, I have no idea how to describe it so i cant search for a tutorial and the closest thing i found was ...
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Is it possible to delete meshes that have baked physics?

It took 17 hours to bake 50k small objects all colliding in a container. There are times when some of those objects escape the container and I’d like to just delete those meshes entirely. Trouble is ...
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Beveled Paths with Collision Physics to Hold in a Weave Pattern

I'm trying to create a model using several path strands in a weave pattern that obey collision physics. Taking beveled lines like this: I want to model these into a weave pattern like this: How ...
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simulate flow of a mixture of water, oil and gas in a pipe

I am a (retired) process engineer who has created a spreadsheet for calculating the size of the separator tanks which are used in the oilfield for separating incoming mixtures of oil, water and gas ...
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Basic cuboid collision mesh not lining up with cuboid, bug?

I've tried to just make a simple staircase out of separate rigid body cuboids. I've made this staircase by taking a cuboid, cutting off faces to make it a staircase shape, then filling in the faces ...
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Making a rigged mesh interact with rigid bodies

I have sculpted a cat and rigged and made a small animation its all ok, now i want my cat to play with objects like little toys, spheres or default cube, I want to key its little paw around and hit ...
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1answer
24 views

Diffuse (cos(theta) or Random) Scattering of Particle Collisions

I'm trying to get particles to bounce off a surface in a scattered fashion. Currently the collisions have the particles bouncing normally, but is there a way to have them bounce off randomly? Do I ...
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2answers
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particles sit above collision object when “size deflect” is active

I have a basic particle system with a cube emitter, uv sphere particles, and a plane as the ground with "collision" on. when running the sim, particles sit half way in the floor. If "...
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Liquid simulation simulates not all water

I ve created a sphere and a cube (flow and domain). When i bake mesh it does not show the water under its surface! Whats the problem?
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Total noob, how do I make something into jelly

I have an Animal Crossing model that I've rigged for some small animation, but I would like to render it falling out of the sky, hitting the ground and jiggling on impact. The tutorial's I've found ...
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1answer
115 views

Fluid Simulation bakes, but cannot see water flow when playing video

I'm very new to Blender. I used it to create a simple water simulation successfully with a domain, collision effector, and an inflow. I'm using version 2.90.1 I've attached my blender file. I'm trying ...
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3 views

Collision between emitted particles and hair particles

I have a plane emitting spheres and I want to block them with object spawned as hair particles on a plane. What is the process to do that?
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Convert Molecular Particles to Keyframes [duplicate]

I have a baked particle system that uses the Molecular Physics addon, and I'd like to convert the particles into keyframed objects... Is there any way I can achieve that? I know it's possible with ...
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1answer
31 views

Multi Colored Smoke

I have two emitters in a smoke simulation (2.9). I want them to both emit different colors of smoke. How should I do this? The two colors of smoke should also interact with each other.
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Active rigid object not following the animation movement of other rigid object

I've created a conveyor belt out of single links using an Array modifier and then a curve modifier to get a conveyor shape. Additionally I've added a keyframe animation on the Y coordinate with a ...
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1answer
34 views

Problems with the physics interaction between two objects

I want the upper yellow element to interact with the turquoise sphere. It should be put over it and when it comes back up it should return to its original shape. When I try to use physics like soft ...
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1answer
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Unexpected behaviour on soft body collisions

I'm trying to get two soft bodies to collide in a zero gravity environment. The way I'm trying to do this is by having soft body one and two close to eachother, and having a third rigid body collide ...
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0 (zero) “Foam, Bubbles and Spray” particles in every frame

System Information Operating system: Windows 10 Graphics card: GTX 1050 Blender Version Broken: (2.90.0) Worked: (2.83.3) When I bake the particles, it takes some time as if it is really baking, but ...
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1answer
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Texture Based Collision

I'm looking to add collisions to a surface which simulate the rough surface of a wall. Since subdividing for a displacement modifier would be a little too taxing on my computer, I was wondering if ...

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