# Questions tagged [collision]

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### How can I prevent boid particles from intersecting?

I'm currently doing some proof-of-concept work for a Lego-style music video with a rock band on a stage in front of an audience. My idea was to use boid particles to simulate the crowd but I'm already ...
106 views

### ClothFX animation not working

I'm not familiar with animation, so I'm betting it's something simple. I'm trying to do a simple cloth collision with ClothFx Haddon and it animates fine with the timeline, but will not render. I've ...
61 views

### How does Mesh based collision shapes works in Rigid Body Simulation?

I kind of understand the difference between Convex Hull and Mesh shapes. But my question is how does the physics engine works for these two? In the case of the triangles how does the engine calculate ...
591 views

### How do I make two objects collide? (Not referring to rigid body or collision physics)

So what I want to do is make two objects not clip when touching each other, instead "following" the shape of the mesh. Basically I want the cylinder shown in this example to go over the pipe when ...
700 views

### how to make 2 cloths collide with each other?

I'm having a problem with a cloth simulation. I've set 2 planes up and applied a cloth modifier to each, what I want to happen is for the two cloths to fall together and interact with each other. The ...
191 views

### Lie object on a surface

I'm trying to lie a object on a surface for 3D printing it afterwards. In other words, I want to find a way to automatically position a complex object the best way on a printing table. Here is a ...
3k views

### Particles fall through collision object

I am trying to make leaves fall on the ground but the leaves are intersecting the ground. This is the collision floor seen from under: The object has collision enabled and Particle Damping to the ...
250 views

### Prevent particles from growing through primitives

For a static scene I've modelled grass on a plane using the particle system's hair type. Now I want to place some objects on the grassy plane, some of which are rather small in height. Unfortunately, ...
65 views

### Bullet particles not colliding with cell fractured model

I have a particle system emitting a bullet object with collision and rigid body. I have it so the particles collide with a cell fractured object which also has collision and rigid body. I have tried ...
606 views

### Rigid bodies not colliding when going fast

I have a scene with (what will be) a treasure map and am trying to animate some coins falling onto it. I started based on this tutorial https://www.youtube.com/watch?v=iYL9w6xsZ6g made a coin, ...
8k views

### How do I stop hair particles going through the body and the head?

Target : I intend to have long lady hair that go swirling in the wind. I am trying to achieve that through hair dynamics. Problem: Hair are going through mesh(body and head). I am using blender 2....
383 views

### Why does a rigid body with Convex Hull collision bounds not move in BGE?

I have an object whose physic is Rigid Body, and I set its collision bounds to Convex Hull (else it would collide with its own children) but now it doesn't move when I play, and doesn't even fall on ...
614 views

### Cloth simulation breaks mesh

I wanted to simulate a cloth ribbon wrapped around a guitar. After baking a cloth simulation however, the ribbon breaks into individual pieces and I have no idea why. Can you help me? Ribbon was ...
4k views

### How do i create low lying smoke (similar to Zootopia), in blender

Hello Blender community, I am a huge fan of the Disney movie Zootopia, the amount of physics and detail really drew me into 3D animation and design. Although I always had an interest in 3D ...
43 views

### Containing a hair's shape within a mesh, even with vertex groups: Is it possible?

Is there any way to contain the shape of hair within a mesh? Would it need vertex groups for more than density? I want to put hair inside a mesh, make the mesh invisible while containing the hair, ...
653 views

### Blender: on/off collision modifier

I have a collision object with the fluid particle emitter inside. The idea is that when the fluid fills up the object, it explodes and all the particles falls out. The problem is that I can't find a ...
447 views

### Is it possible to make a car with this kind of functional axle?

I was trying to make a car and make the axle "work" mechanically. My idea was to make an axle with a flat end and a wheel that would enclose around it like this: Only, when I give these objects rigid ...
1k views

### NSFW Soft body breast acting odd

I have been struggling all day with trying to figure out why the collision is not working on the right breast when the right arm or hand touch it. I threw together a real quick animation and as you'...
867 views

### How to render LINE particles in cycles render?

I'm really struggling in visualizing line particles using cycles render... I'm trying to visualize shortwave solar radiation in a city by using the LINE option (see figure) in the particle properties....
210 views

### Rotate object when colliding

I have a question regarding collisions in blender. I'm trying to animate shortwave radiation (particle system) which reflects on different materials. However when i apply a collision the 'solar ...
2k views

### blender cloth simulation not simulating properly with collision

im trying to get the hang of blender cloth simulation for an upcoming project of mine but for some reason when i add collision to the human its attached to so as to allow it respond with physics..it ...
418 views

### Collision bounds for 2D Sprites in the Blender Game Engine

How can I make Collision bounds for 2D sprites in the BGE? (The 2D sprite I am trying to make collision bounds for is the image I attached below). I imported the 2D sprites as planes with the "Import ...
217 views

### Calculate collision point of rigid body in BGE

I have a sphere (active rigid body) that bounces on a plane (passive rigid body) and afterwards hits another plane (passive rigid body). I would like to get its coordinates when it hits the second ...
71 views

### Change collision properties through time

I've recently started working with blender. For a project i'm working on i would like to visualize evapotranspiration of a park. My animation starts with nighttime where dew is created (picture 1) ...
2k views

### Stop hair from falling through emitter mesh

I have a simple sphere with a hair particle system on it. When I add hair dynamics, the hair simply falls through the mesh. I would like the hair to fall around the mesh and collide with it (both ...
135 views

### Make particles appeared when colliding with a object

I wanna make a particle simulation where the particles would appeared when colliding with an object. My setup is this : Particles are being emitted from a plane. Wind is pushing the particles toward ...
103 views

### Coordinates of non-animated object in frames with python [v.2.77]

I want to create a few animations of a flying ball with initial velocity and get its collision point with a wall. Therefore I created a sphere and 2 keyframes (using animated option in rigid body). At ...
834 views

### Particles don't collide with rigid bodies

I have a scene with 2 Cubes, Cube 1 (using a soft body (Rigid body doesn't work either))falls through Cube 2, and Cube 2 has a particle system on it. I want Cube 1 to "push away" the particles on Cube ...
1k views

### How to prevent hair particles from going through the mesh

How can I prevent hair strands from going through the mesh in other way than using force field so the outcome is like A or B shown on the picture? I've tried using collision with hair dynamics but ...
93 views

### Moving objects whilst in animation

I would like to make a collision with two objects whilst freely moving once object over the other in real time. Is there a way to do this in Blender?
269 views

### Why do particles escape from the tube?

I am very new to blender and only started in February this year and I currently got stuck with a very specific problem. I am doing a project where I want to have bubbles inside a glass tube. I did ...
737 views

### Boids avoid collision?

Im trying to make a flock of birds in a massive cage using boids. But they keep flying through the walls. How do I tell them to stay in the cage?
323 views

### Smoke simulation collision distance padding

I am simulating smoke around building rubble. I have the buildings set as smoke collision objects. However, the smoke seems to leave a huge collision padding around my objects. The buildings are to ...
1k views

### How, specifically, does the game engines friction work?

I have a dynamic physics-typed object. Its material has an option for the amount of friction: Here is what it tells us: Well, refer to the first picture. We see, ...
771 views

### How to wrap an object around a cloth and “squeeze” the cloth, like a napkin ring or rag on a jar

You know the way you'll sometimes see someone with a rag tied over a jar? I tried to make this effect with a jar and a ring (torus) where the cloth falls over the top of the jar (this part works ...