Questions tagged [physics]

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

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is there a way to constrain selected to nearby objects/face/etc. for more realistic collisions?

So I'm trying to make a realistic bullet animation and I wondered about the following points: is there a way to constrain surrounding objects to the selected? is there a way to select objects/faces/...
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117 views

Self Collision - Blender Cloth Sim shrinks mesh

I have been searching for days and have not been able to find an answer to this question. I have a simple model. A thin cube with default collision physics applied and a plain 1x1 with default cloth ...
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61 views

How do I prevent armature+animation from overriding physics in rigid body simulation?

I've been running into a problem where objects that are animated with armatures do not behave as I expect in a rigid body simulation. I put together an example to show the problem that I'm having. In ...
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How to move to collide objects during the physcis simulation in blender 2.8.3?

I see this tutorial that uses blender 2.7: https://www.youtube.com/watch?v=ROE15KY97XM In ~18 minutes he collides a passive rigid body cylinder with a active rigid body gear with "G move", ...
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2answers
52 views

Exporting object's rigid body sim XYZ coordinates

I created a simulation of falling apples into a box. For research purposes, I want to be able to export the XYZ Coordinates of all apples (center of mass of objects, if possible) into a dataset, only ...
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15 views

Partcle System Physics for Fringe

Noob. Working at using particle system to model fringe for a theatre curtain similar to this. 1 I've made a single row of vertex emitting hair particles as tassel objects no problem, and activated ...
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20 views

How do I enable collisions so that objects will not move through each other?

I would like to create or activate collisions. When I say collisions mean that if I have two solids, let's say two cubes and I move one to the other, I will not be able to go through it.
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25 views

Can't get physics scene to bake all dynamics all of the sudden

Using Blender 2.83.1 I can't get my physics scene to bake. It was working perfectly fine a couple minutes ago and I'm not sure what I did but it's not working all of the sudden. When I push "Bake ...
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Is there a way to do self collision for Hair/Fur in blender?

Hi guys i am trying to create some colliding Fur simulation, the normal Hair particle works great but it doesn't have any self collision options or is there any way i can self collide them? So instead ...
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Place pocket(or design) on the cloth mesh

I have a cloth pattern mesh. The goal of my project is placing sensors on the cloth to detect signals from human. So, I need to place sensor pockets on the cloth but only on the front part. This is ...
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How can I stop my rigid body scene with intersecting objects from exploding?

I tried to look for an answer, but didnt find one. Here's the situation: I have a building consisting of many hundred objects. It is "floating" and the mesh(es) are not connected, so its ...
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1answer
24 views

Trying to get solid physics working coherently

I'm trying to make an animation of photos falling onto a surface for an intro. To do this I created a large plane (the ground) which I set to passive mode, then created 28 smaller planes, arranged ...
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23 views

How to prevent soft bodies from moving and only deform?

I'm trying to vibrate a uv-sphere using soft body dynamics. But along with compressions, the sphere also drifts away as shown in the animation. Please provide a solution to prevent its translation.
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26 views

How to add different physics properties to different edges of a same object?

I have a uv-sphere with faces removed. I wish to add spring property to all individual edges of the sphere. Being a beginner, I'm finding it hard to do. So I'd like to know how to assign physics ...
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Does anyone know how to make that liquid in Blender 2.8 ? Link provided

https://youtu.be/04v4qWVtdPs?t=134 I might have some ideas on how to make it, but honestly, I am not sure if it's going to work, I am not that experienced with simulation. If you guys got anything to ...
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Simulation of rubber material attached to two objects

I start my work in a blender and I have to do animation of fins for advertising, the model I received from the client, it will be attached to the foot, the movement of the leg will also move the fin (...
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118 views

How do I remove a cloth pinning at some point of the animation?

I'm quite new in the blender world. I'm animating a balloon that has three fix points when it inflates/deflates and I want it to fly away at a certain point of the animation following the physics I ...
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26 views

What does surface thickness do in Liquid Physics and how to calculate it?

So I want to create a simulation simulating liquid splashing onto an Effector and rolling off. The problem is that when the surface thickness is too low, the liquid just phases through the Effector. ...
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Unable to get Fluid simulation to work in my Blender 2.82

I am watching 3 different tutorials on creating liquid in blender. They all lead me to the same failed outcome: After setting the domain object for the fluid and outflow object for the fluid and ...
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1answer
52 views

Clothes don't collide to its parent : a rigid body

Description of my scene : I have a human face mesh (an alembic file in movement) and ropes made with single vert and whith cloths properties parenting to my face (as child) When my face moves, ropes ...
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23 views

Balloon Soft Body - How to stop inside faces clipping outer faces?

I'm trying to animate a balloon dog but whenever i run the simulation the inside faces of the balloon keep clipping through the outer. I'm kind of new to this and have tried all i can think of and no ...
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1answer
25 views

Book Shelf: Rigid Body Sim- Books thrown out

I'm working on a bookshelf animation, nothing fancy just the books falling into place. I applied rigid body properties to both the book (active) and the shelf (passive). Upon playing the simulation, ...
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1answer
52 views

How to prevent 2 seperate meshes that have soft-body modifiers from clipping into each other and glitching, even if collision is turned on?

What I want to achieve : 2-5 meshes all of which have soft-body modifier. I needed them to bounce onto each other, flop off each other, etc. What I have done so far : Created 2 meshes. Have a plane ...
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How can i have different mass on same object?

So, I am building a project that has double pendulum, like one pendulum attached to another pendulum... So i created a cylinder and scaled it up and made it like a thin long rod and then i added a ...
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56 views

How do I control the Outflow and Inflow amount in Mantaflow?

I know I can change timescale, but then if I have inflow and outflow in one domain I cannot do something like making like a the sink clotting or something, and decrease outflow to not be able to match ...
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(V2.83.0) Mantaflow fire + gas - How to scale emitter

I have been testing mantaflow for the last few days and have a simple problem. I want to create a rocket launch animation. Now fire and smoke should come out of the engine. This works great. But the ...
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2answers
37 views

How to make 2 objects not intersect each other?

I have made an animated rigid body active character and the ground is passive rigid body. But the character's feet passes the ground that I don't want to happen.I want to move character so I don't ...
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1answer
74 views

Set material density [kg/m³] instead of mass [kg]

Is there any way or plugin which allows enter material density in [kg/m³] instead of direct enter real mass [kg] how it is now in Blender. Blender knows the exact size of the object, so it is possible ...
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24 views

How do I get smoke to properly come out of an object and interact with an environment?

I'm only new to blender but I've modelled a room and used flow physics to make it collide with fluids. I've created an emitter through quick smoke, but it doesn't look like the smoke is coming from ...
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74 views

Fluid simulation - Where are the slip options for domain boundary and collision effectors in Blender 2.82 and above?

I'm sure I've seen these options before, but I really can't find the settings for the slip type in Blender's UI - at least not in 2.82. I found them in the documentation for 2.80: https://docs.blender....
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1answer
137 views

How to attach a rigid body to a cloth simulator

I'm trying to make a parachute that can hold rigid body items as they fall and slow the rigid body's fall. I've tried using wind to make the parachute fall slower, but I can't figure out how exactly ...
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1answer
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Physic-based fur/hair on an already animated model from an external software (Source Filmmaker)?

So, I was looking up tutorials on physic-based hair or fur in Blender. However, while I found a ton of different tutorials on the subject, I couldn't find one where you could just overlay the fur or ...
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58 views

How can I make a wall collapse from the top?

I have a wall made up of many cubes and I would like to make it collapse starting from the top, row by row, kind of like a domino effect. I am pretty new to Blender physics and just can't figure out ...
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1answer
53 views

Mantaflow - creating smoke out of fluid particles

im trying to implement mist in my water scene, to do it im trying to use spray particles as a way to generate gas, but yet didnt find a way for it to work. I know it is possible in FLIP Fluid addon ...
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1answer
52 views

Change start and end frame of rigid physics simulation with python

I'm having a lot of difficulty trying to change the start and end frame of a rigid body physics simulation with python. Changing the settings in the UI shows the following in info view: ...
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1answer
6 views

Is there a way to analyze what's using frametime or view all simulated meshes at once?

I have relatively large scene in which I did some cloth simulations. I'm sure I don't have any simulation enabled (went through all visible and invisible meshes). But even without apparently nothing ...
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1answer
94 views

How can I add soft body physics to multiple objects at once?

I am trying to create a "soft body physics method" on an object, but is there any method which can apply it on multiple object at once? (I am not talking about rigid body physics.)
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1answer
21 views

Interacting with rigid body objects as animation plays [B2.83]

In Blender 2.83, I do the following steps: create a plane and a cube. Give 'collision' physics to the plane, 'cloth' physics to the cube. run the animation simply move the plane around by pressing 'G'...
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1answer
60 views

Floating Plastic bag in Air with Wind

I tried to recreate a plastic bag after watching a tutorial but failed to achieve the desired look. The plastic bag is supposed to be floating and moving with the wind but instead, while playing the ...
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45 views

Dual gravity for a fluid simulation (looping animation)

I'm working on this looping animation. When the character falls backwards I want the fluid sim to splash upwards as usual. I've set this up and it's pretty straightforward. What I'm struggling with is,...
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1answer
167 views

How can I add mass to part of a cloth simulation?

I'm working on an animated scene with quite complex cloth simulation (2.83-2.90). Multiple characters and layers of clothing. The dress in the foreground is working perfectly now after much error and ...
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10 views

Delaying rigid body sim not working in my scene?

So I'm making an animation where an object goes around the area "Spitting" monkeys around The idea is that it spits one, then goes to a new area, then spits the second, then the third area ...
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71 views

FLIP fluid simulation does not detect collisions anymore

Sorry for such question, but someone is getting dumber by the second (me or blender): fluid collision stopped working completely (worked before by some miracle) Domain is set, fluid set as Geometry, ...
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1answer
71 views

Blender Best Car Crash Problem [closed]

I have been trying to find the best car crash with the following conditions: Rotating wheels when car is accelerating Car skidding, thus front wheels turn left or right (image the driver trying to ...
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38 views

How do I animate the multiplying of bacteria?

I need to animate the multiplying of bacteria. Starting with 1 bactery, this one splits itself in 2 bacteria, these 2 in 4, these 4 in 8, these 8 in 16, etc. This is called exponential growth. These ...
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707 views

Bake button is missing 2.82/2.83 [duplicate]

I was following a fire tutorial (https://www.youtube.com/watch?v=ezm-ID9ubno&t=227s) on YouTube and got to the part where I have to bake the simulation and I noticed that I don't have a bake ...
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1answer
81 views

How to fix gap between rigid body objects? [duplicate]

I've having some trouble animating my donut. When it reaches the surface there's a gap between the objects, and sometimes the object jitters and bounces when it reaches the surface and I don't ...
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3answers
312 views

Cloth simulation doesn't work for particular object

I'm trying to follow this tutorial: https://www.youtube.com/watch?v=1bGB-EePxWI But when I apply the cloth modifier and playback, the object doesn't drop as it generally would I'm pressing playback in ...
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1answer
38 views

Why doesn't my effector work like I want it to with the new Mantaflow (Blender 2.82)?

I want the plane highlighted in the picture to work as kind of a surface for the water simulation to run through, but when I go ahead and simulate it, it just goes through the object like if it was ...
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7 views

Smoke is not showing up in Properties Tab

Smoke isn't showing up in my properties tab in Blender 2.8, what can I do?

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