Questions tagged [collision]

Blender has several physics simulations that support collisions, such as fluid and rigid body. Use this tag for questions about collisions in physics simulations.

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How to make a hand armature hold an object, but with collision on the object; so the hand doesn’t go through the object?

Say I wanted my hand armature to hold a book, and I wanted to animate different poses of holding the book, but not have to worry about the fingers passing through the book; as though the book itself ...
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Make objects change color during collision?

Hello there, I'm using blender to create an animation with 150 objects. These objects each have an individual material with a simple Emission node, in which it's base color (RGB) has been individually ...
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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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Why does Cloth Simulation get Weird? [duplicate]

I want to create a cloth simulation, but when I play the simulation the cloth get weird sim.... I have attached here the .blend file: https://drive.google.com/file/d/1Ho85NoAc5oCJfID6kPSpt_o9BEMg_iIW/...
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How to interact cloth and object when I'm in Pose mode

This is not my creation. I've downloaded it from a website. When I'm using the Pose mode, the skirt didn't interact with the leg. I make the skirt as cloth in the physics properties and using self ...
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does object particle hair with collision kills emitter particle?

for example i have a plane, with trees on it, and i put the rain emitter particle and set it to die on hit on the ground object. does the particle from the ground(trees) will kill the emitter particle?...
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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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Hair particles going through object, even with collision modifier

I have an issue with my hair particles going through another object. I added a collision modifier to the highlighted object, but it cannot stop the particles from the object around it. Does someone ...
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How To Temporarily Disable Collision Detection?

I made a script that creates hundreds of cubes using bpy.ops.object.duplicate(linked=True) that are given an initial velocity push upwards but the problem is that ...
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Keep Wave Modifier inside an Object?

Whats the best way to keep a Wave Modifier inside an Object? I have a Goblet here with the Wave Modifier applied to the liquid inside, however I only want the liquid surface moving and not the rest of ...
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thin cloth phases through collision objects

I have a vertex string with a cloth simulation but for some reason it just phases through collision objects the high distance value on the cloth simulation is the only change i tried but it did ...
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how to simulate many balls walk

I want to simulate and visualize some situation, there are many people walking inside a big room, with walls and doors. I simply model each person as a ball or a cylinder, and write python code to ...
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how can I go into 'P' mode in normal blender not UPBGE [duplicate]

What kind of mode is when I hit P in UPBGE? Is it 'play' or 'preview'? How can I go into the same mode in normal Blender and not in UPBGE? As I find in this mode, the collision will automatically ...
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1 answer
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how to move object by python script while keep its physics and collision

I am using python script to move an object (a ball) in a room, and it should be in the room, not going out. I have set the rigid body, when play it is ok, it can stop when hit the wall. but when ...
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1 answer
38 views

Blender proton bouncing off of "spongey" atom

Here is my Blender screen shot. I need the proton on the right to bounce off the atom on the left. I need the atom to give a bit (sort of pillow like) when the proton hits it but then regain it's ...
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1 answer
42 views

Rigid body's collision stays in place

Rigid body's collision stays in place even though the rigid body is moving. Because of this, the fabric catches on the void and rigid body passes through the fabric.
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Wrong collisions(bouncing) in rigid body physics with 3 objects

I want a beam being in stable position then move cylinder to another side of pit in beam so higher end of beam goes to floor then do the same but in opposite direction and repeat it multiple times. ...
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particle emit collision

im trying to tip out a bin via particle emission. the barrels bottom is doubled as a emitter. the bin itself is a collision object. i have the problem that the particles are intersecting and sometimes ...
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Blender particle mball simulation, does now work with time stretching

I have particle system, contained within the object mesh, with collisions, with 0.001 second timestep, 27 subframes. The particles object are mballs. All works well when i render movie without time ...
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Two closely fitting angular blocks [duplicate]

How to get the correct and expected behavior of this two blocks, falling down one on another? With using rigid body physics. The default collisions seems not act as you expext. Please, feel free to ...
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3 votes
1 answer
119 views

How do I model a piece of cloth on a chair?

I was trying to create something like a piece of cloth hanging on the chair with a cloth and collision simulations, but I couldn't get any results. Reference photos and my results: How would you ...
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1 answer
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Cloth clips through object only at a specific rotation

so i have this cloth animation, its a plane subdivided 50 times and this is what happens when i make it collide against a resized cube (it works as supposed to, no clipping nothing weird but if i ...
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three questions about particles

is it possible to create a collision particle/hair system on an object without having to animate it? other questions: actually I would like the particles' metaballs not to enter the collision object, ...
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2 answers
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collisions vs rigid body

I'm a noob, sry if I use poor lingo. I made a sphere using a particle system and it instances a little sphere building block. I then filled the sphere with my little blobs that I want to bounce around ...
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1 vote
1 answer
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Blender Fluid Simulation With Moving Container

For this project, I'm trying to have a rigged character move while holding a bottle (simply parented to the hand bone). I see many posts on this website referring to issues with fluid sims that are ...
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60 views

Hide object in render while mantaining collision

I need to hide an object in my final animation render (basically, a mesh on which some particles should bounce), but when i hide it in the render, the collision also disappears. This doesn't happen if ...
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1 answer
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Fluid ignores gravity when hitting Effector, runs horizontal?

I am new to this forum and just signed up to solve this problem that i have with Mantaflow simulations. See I watched a lot of tutorials about fluid simulations but still am relatively new to blender, ...
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Soft body object stuck in original position of 'collision' object. Basic physics simulation problem

so I have this book object and papers inside of it. I've turned on collision on the book cover, soft body on the papers inside of it and I have a force field to push the pages to the side while the ...
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0 votes
1 answer
256 views

Collision Detection

So i found a script for an Collision Detection @ https://www.cbcity.de/simple-3d-collision-detection-with-python-scripting-in-blender But it seems outdated as i get some Errors , any ideas on how to ...
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Rigid Body Coin Keeps rolling after landing on Plane

I have a coin flipping with rigid body applied to both coin and plane. The coin lands fine but keeps rotating endlessly and does not look very real. I have tried the Deactivate setting with no success....
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1 answer
51 views

How to make a gust of smoke collide with 3d text

I've got a gust of wind blowing smoke on some 3d text, however, there's no EFFECTOR or collision in the physics tab to choose from for text, now what? LOL I can make the smoke collide with Suzanne - ...
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15 views

Blender Hair Particle Collision

I have a character walking animation. I used sphere as Hair particles on the character body. I want these sphere to collide each other like rigid body linking. I tried hair dynamics and it does ...
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3 votes
1 answer
391 views

How to make a cloth simulation reach its resting neutral shape faster after it is disrupted?

I am trying to learn more about cloth and collision simulations. I built a plane with a subdivision and cloth modifier, pinned it's top edge, then had an impermeable cube animate upwards to "...
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63 views

How to simulate a rolled/folded/bunched up window curtain dropping down?

Goal I am trying to simulate the effect of a window curtain dropping down from a bunched/rolled/folded up position. There are three ways a curtain can held up. It can be rolled up, folded up, or just ...
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  • 373
0 votes
1 answer
44 views

Make Ball bounce around in a cube infinitely

I am trying to make a soft body ball bounce infinitely off of all the walls within a cube. Unfortunately I have not had any success with this. Everything loses momentum and stops, even with all ...
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0 votes
1 answer
66 views

Fluid simulation particles are offset from the effectors

Every time I simulate a fluid simulation in blender it always 'hovers' above the desired collision. I've tried applying the scale, I've also tried to set the normals to a smaller size but still no ...
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1 vote
1 answer
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what is the purpose of collision

Hello I just want to know what is a collision exactly? the word means clash or two objects got hit together ( this is the meaninng I got in google translate when translated it to my language). What ...
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1 answer
31 views

Pulley on stationary axle

I'm new to blender, and for some reason it appears that no one has ever made a simple pulley (at least I couldn't find any forums or videos on it). I need a very simple pulley on a stationary axle. ...
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30 views

Disruption of Size Deflect when using Metaball in a particle system

I created a particle system inside, placed the Emitter in an X-type MESH and assigned it the Collision property. But when the metabolites become larger, they fly out of the Collision object
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1 answer
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Smoke won't collide with my mesh

here's an image: Smoke won't collide with my mesh, instead it goes through it. As you can see, my mesh has been given an Effector type: collision. What's the issue here?
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2 votes
2 answers
94 views

Delay freefall of a cloth mesh

I got a single object made of multiple cubes with a cloth modifier applied. My goal is to delay freefall for every cube so for an example: Green cube freefall will start at 30th frame. Pink cube ...
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3 votes
2 answers
102 views

Cloth modifier doesn't collide properly

There are 4 identical cubes with the same specs - cloth and collision modifiers. The problem is that during the collision the green cube is not affected by the blue one at all. On the left side: green ...
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1 answer
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How do you make a new collider?

I'm currently working on an obstacle course for some soft-body balls to go through, and I'm right now stuck on creating a funnel. I'm trying to make the balls go through the funnel, but there's ...
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0 votes
1 answer
52 views

How to make Juddery Simulation of Falling Leaves smooth?

I am using a particle system and a force field to simulate falling leaves. The leaves are falling from the sky and are supposed to stay on the ground. I encounter two problems here: The falling ...
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1 vote
1 answer
167 views

Deactivate collision between certain Rigidbody objects?

I have a model consisting of many seperate objects that are all overlapping with each other and I want to use Force Fields to "destroy" the model. How can I stop collisions between the ...
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0 votes
1 answer
174 views

Particle system collision with itself and other objects

I'm trying to make a scene where some particles shoot up from a phone and then land on the table the phone is on, i can make them shoot up and bounce off the table well but when they land they seem to ...
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0 votes
1 answer
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How do make soft-body balls go through a hole?

I'm currently working on a tutorial for a soft-body obstacle course, and I want the balls to go down into a funnel. However, when they land on it, they get stick to it, when I want them to roll down ...
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1 vote
1 answer
168 views

cloth sim refuses to respond to any and all collision objects

Here is the blend file: https://drive.google.com/file/d/1EvQ3yYtWmFcM7evke1OW3uL0aInsn0rM/view?usp=sharing I have tried everything, everything to stop my cloth sim wire from clipping through this ...
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1 vote
0 answers
50 views

Adding physics property to mesh doesn't do anything?

I have an existing animation via "how to use blender" tutorial from Blender Guru (Donut 3.0). I'm trying to now go beyond and do my own thing but I can't seem to figure out why I can't get ...
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Blender Cloth Physics - Limit Object Collisions to several collections

is it possible to limit the object collision of a cloth to more than one collection. I can only select one collection. Thanks!
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