Questions tagged [physics]

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

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how to add a volume cube

I can't seem to add a volume cube in blender 3.2.2. I don't understand cause I am new but I saw a video called blender getting crazy at 0120 he added a volume cube in geometry nodes but that option ...
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About the simulation not working normally only on my desktop

I'm making a fire with quick smoke. This doesn't come out if you set the cache to all or module, but it comes out as replay. So I thought it was a problem with the computer, so I turned it back to a ...
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Convex Hulls in Blender

I want to create a cylinder with the purpose of importing it into a physics engine (MuJoCo to be more precise) which uses convex hulls. I created my simplified geometry with 16 faces. Now I want to ...
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How do I teleport geometry between 2 empties while redirecting the velocity relative to their rotations?

I want to make some portals in blender, and have things go seamlessly through them. So far, I've managed to get it to work visually, but I want to be able to run a physics simulation to really sell ...
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What are possible options to flatten an object due to weight and viscousity, or fake it :)

I've modelled this kind of toothpaste piping. Trying out beziers etc. Now I'd like to make it look as if the matter is being squished a bit, via gravity or some other technique. The look I'm after is ...
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How to achieve Spheres going in circle path around center

I want to achieve something like on this video, where spheres/balls are going in circle motion around center. https://www.youtube.com/watch?v=uf6oC42U-KE on 0:16 for example. It's not clearly visible ...
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How to add liquid or smoke effect in headless python?

Has anyone a python script at hand to add physics effects (liquid or smoke) headless from scratch? I'm asking since either quick effects or my non-quick attempt below result in ...
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Gravity Collider Bone Physics does not work when cube is hidden

Gravity Collider Bone Physics https://modelinghappy.com/archives/43818 I added physics to this add-on to show the cube and weight paint on it, but when I export with the cube shown, the cube appears ...
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How does this python script help showing phyics bake progress?

The python script below script should show the bake progress in python. Yet neither in the blender UI nor in the terminal I can't discover anything. ...
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Hidden armature meshes and physics objects are still processed for a visible armature, is there a workaround?

My animation playback is less than 2fps in a certain blend file. I've tried opening it with addons disabled, which brings it from <1fps to <2fps. A have a Rigify rigged character in a scene. I ...
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Particles Rendered from Collection Are Missing Their Material

I made a Blender File where I'm trying to emit "cold sparks" from a simple sphere. I created a sphere over a plane with a collision physics simulation on the plane. I put a particle system ...
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How do I make particle velocity separate from the emitter's rotation?

I'm trying to make an effect similar to that of an object falling into water, with bubbles appearing at the bottom and making their way up. This works fine by setting the Z-Velocity of particles to ...
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How to prevent bones from transforming between frame 1 and frame 2

I was following this tutorial for creating a ragdoll in blender. It basically says to delete parents from all bones in a rig, then create cubes (colliders for the ragdoll) with rigid body physics ...
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Blender 3.2 / Chest jiggle with cloth physics / Render problem

Animation works nicely when i bake cloth physics. When I rendering the animation as a image, it doesn't take the cloth physics. Could you help?
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Smoke in the wrong side of the domain

When I add quick smoke to the default cube that happens
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Jiggle physic bones

I was trying to make jiggle physic in unity using some bones that i made in blender and its working fine, but now I'm trying to add physics to some parts of the legs that already have influence of ...
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Hair dynamics in a moving car. What is the solution?

I have a character with long hair in a moving car. The car is driving along and the hair is blowing back as if she was on a bike. I don't want this. How can I have dynamic hair (so it's falling ...
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Lock Vertices From Being Affected By Gravity

I have a simple cloth simulation set up that lets it collide with other rigid bodies. It currently falls down because of gravity but I would like to lock the top vertices into position so that it ...
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No physics collision when filling a sphere with fluid in Blender 3.2

I can't fill a sphere with fluid when using Blender 3.2. I tried using a number of solutions from Youtube videos tutorial and from this platform, but none of them work and my fluid just drops out of ...
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Deflect/ reflect object "shot" at surface using nodes

I've been trying to create a procedural animation where a set number of objects "emitted" from a set point moves towards random points on another object's surface. Once it collides with this ...
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how to keyframe "animated" of rigid bodies to multiple objects

Is there any "trick" to how I can set keyframes for "animated" for a rigid body for multiple objects? I know, "normally" you can select multiple objects and set press &...
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Simulate character melting but retaining some volume

I'm trying to recreate this gif of vaporeon melting ( https://c.tenor.com/TAB--fTTrwQAAAAC/pokemon-vaporeon.gif ) with a model of my own character. However, when using soft body physics, the mesh ...
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Why does the old collision still interact with other simulated object?

It's as the title says. I made some cheese react with my burger patty using the cloth simulation modifier. This works fine, but I wanted some tomatoes to fall on the cheese and eventually some lettuce ...
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Resume cached fluid bake in python

I am finding this useful to clean up some fluid cache files and re-simulate from where I change the flow on a single source that I'm adjusting for Initial Velocity. The flow is set to be enabled on ...
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How to make an object explode/blast out of a launcher?

So basically, I have an object as a launcher and an object that resides in it. I want the object in the launcher to blast/move out very fast, hit a wall, and crack down. If the blasting/moving out and ...
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Geometry nodes instances animation, then apply Physics?

I'm trying to add Physics to some Geometry Nodes instances. I have an animation in GN, where the instances moves up, then to the right, and then I would like to apply Physics to make those instances ...
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Soft Bodies floating up

for some reason, the objects are floating up at the end of the gif. All settings are identical on the objects. Any Help on how to debug this? I played around with the parameters for some time now but ...
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soft body parameters

I am having troubles understanding the soft body physics. I created this very basic setup And I have some questions: Why do I have to crank up push and pull close to max? If I use anything less, the ...
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Make my smoke less fake

My smoke looks like coming from an electronic cigarette... I used the particles system to create this smoke. I tried to play with the density using shader nodes but it's been unefficient. On which ...
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Wiggle Bones dont work when linked to other scene

I like to use the Wiggle Bones Addon for this Character Feature, because its easy to work with and the results look very goody for my purpose :) (I got that addon from here, version ...
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1 answer
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Hinges - how they make to follow rigid body?

I'm still confused with Physic and Constraints. I'd like to have two bodies - connected together by hinge (let say vertical beam on a platform , connected to horizontal beam). I'd like to move the ...
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Cloth + rigid body - weird behaviour

I'd like to use your help one more time. I was able to attach cloth to rigid body and I'm studying it, however it works only partially. In the example below (please see screenshot and attached blender ...
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Hair dynamics doesn't work after subdivide

I was created clothes, and wanted to create hair. Now, hair dynamics work fine before I subdivided. I used F3 to search for select the roots and then Ctrl + Numpad Plus to select other vertices, right ...
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1 answer
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Activate rigid body by distance (3.0)

I have a model that I cell fractured and I would like the cells to fall down one after another from top to bottom, like a kind of wipe. Is there a way to activate the rigid body simulation of these ...
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Why Won't My Fluid Sim Come Back To Life?

I successfully set up a fluid sim, baked it, and all was well for my project. But then I wanted to make a change, deleted the cache, and now the domain will not come back to life. I'm stumped. So ...
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1 vote
1 answer
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How do I get a cloth plane to "go back" to its original shape after being disrupted?

(I'm still learning Blender as I am quite new to it). I am trying to make a model of Space time curvature, it consists of a wireframe plane (cloth) and multiple Spheres (with collisions). The ...
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Baked particles - can physics (collision) be switched off afterwards?

I have a Star Wars scene with a Star Destroyer and an XWing. The XWing fires lasers at the Star Destroyer. The laser is based on an emitter plane with particles as the laser beam (learned by tutorials ...
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Rigid bodies not working correctly

so im trying to make a dangling chain with rigid body physics in blender. Heres the problem: I added a rigid body to the first chain as a constraint so it will be able to dangle. As you can see I ...
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How to apply the physics fluid properties?

Can somebody please instruct me on what to do here? I haven't had any results for 2 weeks. Here's what I've already tried: Quick Effects - It doesn't give me the results I'm looking for. Neither can ...
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Why Physics Bakes are not showing on render?

On my viewport everything is fine, I tried deleting bakes serveral times but it doesnt work, this is how it looks on my viewport: And this is how it looks on my render: The blend file is attached.
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1 answer
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DIstribute points on Simulated Cloth?

Is there a way to make a geometry nodes point instance work properly with cloth? In my test it seems to work but the points randomly appear and disappear.
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Cycles refraction on a plane glass is not physically correct?

I was trying to see how glass refracts light. I set up a scene with a conical light source facing a wall with a pane of glass in-between. Theoretically, the glass plane should refract to show an ...
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1 vote
1 answer
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how to make instances of particle system spin around only one axis?

I want to make a particle system with maple seeds falling on the ground. The seeds should be spinning only around the z-axis and react to force fields like wind or turbulence. Is it possible to lock ...
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Which algorithm is used for cloth simulation in Blender?

Does someone of you know, which algorithm is used to simulate cloth in Blender (Cloth modifier in physical properties)? I've seen a 2017 answer with links to several papers that look plausible, but ...
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2 votes
1 answer
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How to make a cloth affect a rigid body and simultaneously follow the rigid body?

I'd like to connect a rigid body and cloth for a sail animation, so when the rigid body is moving to the right when wind is blowing and the cloth is moving to the right I'd like for them to be ...
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How could I replicate the symbiote (without a host) seen at Venom and Venom: Let There be Carnage?

I'm trying to make my own symbiote, and I wanted to make it looks like in the Venom film (NOT SPIDER-MAN 3, it's not the same) when it's without a host. I've tried with a softbody but it don't looks ...
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Force field set up for gravity simulation

I am trying to create a very simple example where I set a force field on an empty to simulate Earth's gravity. The scenario consist on: a cube, with rigid body enabled (active), set at an altitude of ...
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low level alternative to bpy.ops.rigidbody.world_add()

What is the non context depended way for adding physics to blender scene ? at the moment i`m forced to select a scene and then use the ops function: ...
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The "wind" force field and the "turbulence" force field do not work on the particle system. why? [closed]

The object has grass on it, and I want to make it flow, but when I add a wind force field it does not show any effect, or I want to make realistic grass that flows like real grass, but nothing was ...
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Physics Simulation Baked and Edits Made: How To Stretch Timeline Now?

In my case I have unfortunately already baked my physics simulation and made several edits in it to suit the animation i want. Thus I cannot delete the bake anymore because when i do it, it changes ...
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