Questions tagged [physics]

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

Filter by
Sorted by
Tagged with
0 votes
0 answers
9 views

Rigid body constraints problem

How do I keep the two bars from coming out of the existing pivot? I use Rigid Body constraints for all existing mesh, can anyone help?
0 votes
1 answer
28 views

Enable physics in animation [duplicate]

I have a rigged robot and animated bones, and I want to add physics to the robot so that the robot can interact with the scene, e.g., hitting an obstacle. I set rigid body to passive and check ...
  • 31
1 vote
1 answer
8 views

Hide mesh faces while maintaining collision

I am animating a character and using a cloth simulation for their clothing. Part of their body mesh will occasionally clip through the cloth, which I would typically solve by sculpting or hiding the ...
  • 13
1 vote
0 answers
16 views

How to add physics in animation [closed]

I have a rigged 3D model and the pre-recorded animation, and now I want to add some physics to the model. For example, when the model is moving and run into obstacles, collisions are expected, and I ...
  • 31
1 vote
1 answer
11 views

How to keep root of cloth simulation anchored to bone?

Trying to get the leaves of this plant to shake/bend in response to armature animation. Tried adding rigid and soft bodies plus cloth; the cloth by itself falls due to gravity and seems unaffected by ...
5 votes
1 answer
113 views

Assign vertex group in Geometry Nodes (v3.3)

This is my Geometry Node Setup. (EDIT: Here's a .blend file showing my nodes, modifier, vertex group, etc.) I create a grid, rotate it vertically, and then select out the topmost vertexes to assign to ...
  • 121
2 votes
1 answer
42 views

How to dynamically simulate physics with python?

I try to simulate dynamic behavior in blender using physics for rigid bodies. Some objects should fall down onto a moving plane. (there is a previous question related to that: animation locations with ...
  • 205
1 vote
1 answer
16 views

animation locations with python

I try to design a physics animation with python / bpy. The simulation as such is fine. But I try to read the coordinates of falling objects while running the simulation. For this purpose I use bpy.app....
  • 205
1 vote
0 answers
26 views

Blender Deform Modifiers: Trying to Bind Fiber Mesh (Pure Edges) to Cloth

I've been playing with Blender 3.3's hair system. Off the suggestion from another question, I've been exploring combining cloth physics on a proxy fiber mesh and the hair deform Geometry Node which ...
0 votes
0 answers
14 views

Dynamic Place in Blender - Live moving objects with physics Interactive rigid body

Is there an add-on or an option in Blender, to have a live objects moving with physics. I have attached here an example with what I am looking for.
  • 784
0 votes
1 answer
32 views

Unexpected physics behavior with copied objects

I try to copy a uvsphere which has basic physics behavior: rigid body, collision mesh. The spheres should just fall down onto a plane. The code to create the copies is here: ...
  • 205
1 vote
0 answers
15 views

Do you still use Visual Transform to keep an object (which has fallen) in its final place?

If I have 2 cloth items which fall onto multiple surfaces set to collide, how can I keep them in the final 'resting' position? Visual Transform does not work for me. Is there a new or different way to ...
  • 11
1 vote
2 answers
191 views

Physics in Blender 3.3 Hair System?

I hear about all the great things about Blender's new hair system EXCEPT, for one thing, physics! Can you add hair dynamics?? I am currently working on my first animation clip and held out for this ...
0 votes
0 answers
15 views

API access physics state

Is there a way to access the full physics state from the API? E.g. the resulting forces/torques for a constraint? It seems like only the body position transforms are available, but I'm also looking ...
  • 1
1 vote
1 answer
22 views

Saving the state of objects at specific keyframe

I am trying to create a game asset in blender and for better accuracy and in order to be more realistic, I am using the physics tool for the asset I am trying to make. However upon interacting with ...
  • 11
2 votes
1 answer
67 views

How can I create an animation of many ants spawning from a central point and fanning outward?

I have a single animation of an ant walking across a plane and I'd like to use that as the base for a larger animation with hundreds of them spawning from a central point and walking outward in ...
  • 123
0 votes
1 answer
21 views

Having trouble joining the rigify with rig bone and hair rig mirrors

I need your help. how do I join rigify? I have tried that and it messed up. see the picture below. see the red circle. that's a hair bone. and an orange one that's rigify. Then the second picture, ...
1 vote
1 answer
20 views

why an active object can't go through a hole in a passive object?

I have this scene but when I start the motion, the ball still floating in an invisible face of the cylinder why?
2 votes
0 answers
48 views

Making a shaking leaf ball character

Currently I am making a character which is a leaf ball. Everything looks great until I try to rotate it with armature. I use hair particles to create leaves and cover it on a sphere. When the sphere ...
0 votes
2 answers
40 views

Cable cloth sim + skin modifier + attached object

I have this cable swinging in the wind (cable = connected vertices with a Cloth modifier). I attached an object to it. Vertex Parent works just fine (2), and physics is beautiful (3). However, when I ...
  • 568
0 votes
1 answer
32 views

Physics setup to test gears won't spin

The attached Blender file is setup to run with the physics engine. When I run it, the wormgear does not spin, and the wormgear and wormwheel seperate. Can anyone offer any suggestions?
  • 25
1 vote
0 answers
23 views

How to stop a Rigid Body link from automatically re-aligning

I am simulating the action of a toy horse front right leg using Rigid Body Physics in Blender 3.2.2. Once completing the full horse, the simulation will interact with other objects in the environment ...
0 votes
1 answer
45 views

Cloth simulation not deforming properly with hooks

I have a low poly mesh with a cloth sash that I'm trying to drape on. Most of the hooks in the cloth simulation work great but for some reason the top of the robe acts strange and just arcs in the air....
  • 3
0 votes
0 answers
20 views

Multiple colliders causes cloth simulation to freak out

I've got a simulation dropping a cloth onto a couple of mesh objects. When I test it with just 1 object, it seems mostly stable. When I involve a second object/mesh that's touching the first, it ...
3 votes
1 answer
42 views

Boid Particles wont climb

I am trying to have a swarm of insects climb a wall.However the climb checkbox doesnt have an effect when it comes to climbing objects like walls that have a 90 degree angle. Is there a way to have ...
0 votes
0 answers
13 views

Rigid Body Physics not working because of Characters from Character Creator 3

I've been working on a scene, where a bullet smashes through a window and then hits a character. The characters I'm using were made in Character Creator 3. However, all physics was not working. I ...
  • 1
1 vote
1 answer
26 views

Visualising multiple spherical particles translating and rotating in a box

I have a simulation of particles that are translating and rotating inside a cubic box. I have a txt file of their positions. I need to import them to Blender and show their dynamics. x_1 y_1 z_1 x_2 ...
1 vote
1 answer
32 views

Sphere in Rigid body simulation not touching the ground after the first bounce

I have tried to reduce the margin. I have tried to update Blender and tried older Blender versions. I'm trying to get my sphere to touch the ground after it bounces off the plane and comes back down. ...
1 vote
0 answers
17 views

Why do particles don't react with physics once the hit the "floor"

I'm trying to make some circular-shaped confetti fall onto the ground using particles, but the "confetti" just lands with the same orientation as how it was dropped and does not react with ...
  • 11
0 votes
0 answers
15 views

How do I wrap a string around my characters neck and connect it to the star?

I just want the torus to fall from the characters neck, without phasing through. I haven't messed with physics yet though. Trying to apply tutorials to this is melting my brain. Curves are easy to use,...
  • 25
0 votes
1 answer
18 views

Can't get second brush to register on canvas using dynamic paint image sequence

Trying to paint a plane with 2 brushes at the same time, but one isn't registering on the canvas in the image sequence bake. I'm painting one texture on top of another using image sequence. I got it ...
0 votes
0 answers
5 views

attaching two object with different cloth physics settings

I would like the hoodie part to connect with the main part, but I want the upper part to have a bit more denser physic, like this the hoodie alwazs just falls off, can i attach it to the other, kinda ...
1 vote
1 answer
24 views

Weird Blender Rigid Body Physics

I am rendering a simple rigid body simulation where a cube made up of lots of smaller cubes falls onto a plane. When I render or play it back in the viewport the physics looks really messed up. All ...
  • 23
1 vote
1 answer
25 views

Blender fluid basics: how to create water

I’m a beginner at blender physics and I’d like to create add in an empty cube container some water, but I haven’t found yet a good tutorial about blender fluid physics. Can anyone redirect me to a ...
  • 13
0 votes
1 answer
29 views

Water not flowing out of effector [duplicate]

I was making an orange smoothie sim but then I realized that when I wanted the water to pour down the glass cup the liquid sticks, I haven't enabled viscosity and I keyframed the initial velocity on ...
0 votes
0 answers
370 views

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 ...
0 votes
0 answers
12 views

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 ...
  • 1
0 votes
0 answers
30 views

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 ...
  • 11
0 votes
0 answers
23 views

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 ...
4 votes
0 answers
38 views

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 ...
0 votes
1 answer
21 views

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 ...
  • 561
0 votes
0 answers
13 views

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 ...
  • 926
1 vote
0 answers
12 views

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 ...
  • 21
0 votes
0 answers
18 views

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. ...
  • 926
0 votes
1 answer
17 views

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 ...
  • 544
1 vote
1 answer
20 views

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 ...
0 votes
0 answers
21 views

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 ...
1 vote
0 answers
25 views

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 ...
0 votes
0 answers
62 views

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?
  • 1
0 votes
0 answers
6 views

Smoke in the wrong side of the domain

When I add quick smoke to the default cube that happens

1
2 3 4 5
39