Questions tagged [physics]

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

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Rope Physics Causing Issues

I've read through a few questions, watched at least 5 videos and I'm getting stuck on this. Hoping more experienced users can help me out. In the attached Blend file, I've got a mortar board I've ...
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0answers
8 views

Is there any way to save local variables in animation nodes?

I'm simulating a physical system and I need to store local variables for solving the differential equations of the movement and I was wondering if there is a way to store variables from one frame to ...
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10 views

Physics Disk Cache in Different Blend File

I have saved cloth and particle simulations to disk, and I would like to save the project with a different name in order to make changes to the scene but retaining these extensive particle and cloth ...
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1answer
28 views

I want to make the muscles pump like a heart (Resident Evil 4 Final Monster)

I want the muscles of the legs pumping and have translucent properties so to show something is pumping inside. I know I can do soft body or cloth sim but I'm not sure how. I don't know how to pump it ...
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1answer
6 views

No fluid generated when baking data + baking mesh (2.90.1)

trying to create an effect of blood dripping that will be late composited into a video. I've tried changing the scale, resolution, particle min/max, but no matter what i do, baking the data+mesh on ...
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9 views

Resume fluid simulation from correct frame after Blender crash

I am currently running a fluid simulation that aims to simulate 360 frames. I have the file saved at the 150th frame, and decided to leave the fluid simulation running. When I come back Blender ...
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2answers
72 views
+50

Make particles stay on Plane

I have created a particle effect that is influenced by a vortex. Now I want to create a plane that is the parent of both of these object. That way this plane controls the orientation of the emitter ...
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2answers
2k views

how to create realistic/physically accurate sand blowing over dunes animation?

This question addresses exactly what I want but it hasnt been answered: How could I create a sand dune animation? In case it might be helpful I found this paper on the physics of it (although ...
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20 views

why dosen't the motor constraint work properly?

I made a simple car with physics and rigid body constraints. The car can go downhill, but I wanted it to go uphill. so I added a motor constraint with an angular velocity of an inpulse of 10 and a max ...
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1answer
32 views

Improved explosion: possible to nest smoke domains and apply them to mutually exclusive emitters?

I've been following an explosion tutorial. Blender's quick smoke results are very impressive but I'm trying to mimic artillery explosions I've seen on youtube in several places. In particular, I've ...
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8 views

better path for particles when morphing between shapes in same location

I am using keyed particles to morph between shapes with different numbers of vertices. I want to show the progression between series of embryo brains in the same location. However, the particles in ...
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0answers
58 views

Expanding Baloon-like/softbody object (how to do in Blender, easy in Cinema4D )

So I've seen alot of motion graphics animation from cinema4D the most recent one is the animation from Mi Fans 2021 the animation is here : https://www.instagram.com/p/CNctrJfHwQ5/?utm_source=...
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Soft Body render not rendering properly / making weird artifacts

I'm trying to render a soft body simulation I did of some geometric shapes floating away. I bake the simulation and it all works fine in the viewport however when I go to render it comes out like the ...
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16 views

Golf club and ball: Adding Initial Velocity to a rigid body simulation:

I'm trying to make a simple golf club hitting a ball (will become part of a larger rube goldberg machine at somepoint hopefully). Just playing with rough settings at the moment before modelling but at ...
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1answer
35 views

How to get the updated rotation of an object during soft body physics simulation?

I am trying to get the updated rotation of an object during simulation in Blender 2.92. However, I am not able to get what I want. I appreciate if someone can help me with this. As you may know, you ...
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1answer
15 views

I use physics to find the position of the objects, but then I can't save and go on

beginner here :-) I am trying to use rigid body physics to set objects' initial position. At first I was puzzled because I got to the end of the animation and could not even change the material or the ...
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0answers
22 views

Animation: Rigid body physics on chain links how to move the object?

What I want to do: One plate fixed to "wall" chain linked to cuff on hand of the armature. move arm chain gets tighter or looser. Newb Question. I created individual links in a chain; added ...
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1answer
43 views

How could I run a Rigid Body simulation backwards after it is baked?

How could I take a Rigid Body simulation (it doesn't matter if it is already baked or not) and reverse it before rendering. I do not mean reversing the clip after it is rendered (mentioned here). I ...
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4 views

Dynamic Hair not colliding with mesh

I have been working on simulating hair and cloth on this model. The Headscarf in the image is a cloth with collision physics and works perfectly. The hair have dynamics enabled but they pass through ...
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1answer
26 views

Having a collision object. How to kill particles from a defined source?

I have two independent objects (P1, P2) with particle system on each of them. I have another object (C1) with collision and option kill particles enabled. Is there a way to configure C1 so that it ...
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0answers
21 views

Squeeze a gel filled stress ball

I'm trying to make a stress ball (an elastic balloon type material filled with a gel). So then when you compress it; the ball maintains similar total volume but its shape is deformed/displaced. I've ...
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1answer
24 views

Cell Fracture Destruction

I'm currently running into a weird issue with my scene and not sure how to overcome it. Firstly my cell fractured object with connections seems to be breaking before the ball hits it and when the ball ...
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0answers
37 views

How to make a tie fly up/down with physics

I'm having trouble on how to make a Tie have physics so i don't have to animate the Tie. Example, if i make the character Jump the Tie should also move/rotate how it should be. (Without animating it) (...
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8 views

Let fluid simulation hold final frame [duplicate]

I have a mantaflow liquid simulation in the 2.92 version of Blender. This simulation starts at the beginning of the animation but stops before the animation ends. When the animation plays past the ...
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0answers
27 views

Why is my object moving out of place during a Cloth Simulation?

I am using a Cloth Simulation on a plane to create a cushion. However, when I apply any form of Pressure it moves out of position. Below are images of the setting, the first frame and the second frame....
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1answer
26 views

Tube Deformation Animation with Pill Passing Through

I'm making a medical video featuring a robotic pill passing through the human digestive tract. The animation features the pill sliding down a cross-section of the esophagus and small intestine. I'm ...
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1answer
28 views

How to identify mysterious physics force affecting my objects?

I have some connected rigid body objects (a ragdoll). When I let physics do its thing, the ragdoll doesn't just fall - it acts as if some mysterious force hits it. While investigating what might be ...
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20 views

How to balance a heavy object on top of cylinders

The blue cylinders are a scaffold. The orange circle is supposed to grow on them which means that the cylinders in contact with it should be bending towards it. Can this be created using a force field ...
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1answer
20 views

Rigid Body and directional constraints

I would like to be able to 'push' multiple Rigid Body objects up along Z-axis (using another Rigid Body). The trick is that they must only move on the Z. And once pushing force is gone the objects ...
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0answers
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I made a pile of balls using particle system and physics and now i want to replicate and transform this pile as an object not a simulation

I tried going to modifiers tab and click convert on the particle system modifier, but that tries to convert the whole simulation and crashes my pc , I only want to convert one frame of the simulation ...
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0answers
46 views

How to get frame-by-frame object location in Blender 2.8+

I am trying to get the frame-by-frame location of the softbody physics simulation (collision of softbody cube with a plane). I am incrementing the frame of the simulation using ...
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0answers
29 views

How to display moment of inertia Blender 2.91

I'm making a wind turbine simulation in blender, and it needs to be roughly physically accurate. I know that blender must have a way to calculate the moment of inertia of a spinning rigid body, but is ...
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1answer
33 views

Why aren't these objects rotating? Physics question

Here is the project: https://www.dropbox.com/s/e3k8811psg7dkq1/PackingPeanuts%202.blend?dl=0 2 I've added some forces on rigid bodies - they are shaking about but not rotating. Does anyone know why? ...
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1answer
77 views

How to create physically accurate boat moving through water

I am am making a short realistic animation of a sailboat going through the ocean. I have an ocean modifier with the time animated. I have a plane shrink wrapped to the ocean and the sailboat model ...
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1answer
26 views

How to setup reasonable ragdoll constraints between body parts?

I'm trying to create a ragdoll to animate a falling person, following How To Make Any Rig Into a Rag Doll in Blender (Tutorial). Basically, it means that you create a cube (rigid body) for each bone, ...
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1answer
32 views

Rigid body simulation of helical gears/oblique pressure vectors

I have two meshes of helical gears. I tried to simulate their motion using rigid body physics. Both gears have hinges connected to a static mesh, and one of them has a motor. When I press play, the ...
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0answers
12 views

Could I make keep the animation position as the new position for an object?

I'm trying to simulate a cloth patch which is a rectangle to "stick" to something irregular like a forehead, so I thought of animating it by using a force field animation and it pushes it ...
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3answers
60 views

Non-wrapping rigid body rotations?

The simulated transformations of a rigid body can be read out through .matrix_local, .matrix_world, and animation drivers set to ...
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1answer
10 views

Animating active object issue in motion tracking project

Why won't my 'meteorite' continue forward follow-thru even though set as an active object in the Physics tab? • Project for school - to VFX a meteorite striking building • Must finish by this coming ...
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1answer
57 views

Merge objects in softbody simulation

I have joined the objects but they just won't hold together. In the first image, it's as it should be and on the second once it hits the ground, the objects get separated.
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1answer
54 views

Is blender good for real physics simulations?

I want to make some simulations which present some real physics problems like box sliding from slope with friction. Does blender use real physics rights to animate simulations or is it only ...
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0answers
12 views

inclined plane with friction

I want to make some physics visualisations with module Rigid Body. I started with a simply simulation of sliding box across slope to check how this module works. Using Python I create plane and box ...
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1answer
50 views

Trying to realistically deform an inflated balloon so that it retains its volume

I'm using the new pressure settings for cloth sim in Blender 2.9 and I'm able to use a moving object with collision on it to squeeze a spherical shape with cloth and internal pressure applied to it. ...
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1answer
67 views

How can I make a desert with sand that interacts with a car?

I want to make a scene with a car in a desert, starting off on pavement then going to sand. How could I make the sand "kick up" behind the car, on the pavement and on the sand? And is it ...
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0answers
19 views

Particle colours vary between preview and render

I made an animation which comes out very colourful (with random flashes of light) in the preview but when rendering via viewport render or F12 render, the colours come out less lively (check photos ...
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0answers
14 views

How to extract surface triangles from a tetrahedral mesh?

I want to render a tetrahedral mesh using Blender. However, I cannot directly load the tetrahedral mesh in Blender as the file format that I have for tetrahedral meshes is not supported. My ...
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1answer
7 views

Particle edit mode invisible geometry

In particle edit mode when combing hairs,I find that some areas have collision "the guides can't be at that place" while there is nothing there.I don't know what is the cause.
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1answer
37 views

Problem making a cloth

I am trying to make a cloth and they do not sew completely So the armpit area is not fully sewed as you can see. The cloth is made by just sewing two planes. Above is modifier (left) & physics (...
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0answers
12 views

Hair dynamics won't work for some hair

I have created a simple hair system but the strange thing is the particular hair on the left is not affected by the simulation. There is nothing special about it,I just use curve bevel and convert to ...
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0answers
13 views

What parameter will help the balls follow the container?

I am trying to finish a scene and the rigid bodies part is really taking me more than expected. The balls show follow the container while it moves. These are my settings (I also attached the rigid ...

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