# Collide with Sphere

Menu Path : **Collision > Collide with Sphere**

The **Collide with Sphere** Block is used to define a spherical volume for particles to collide with.

![](Images/Block-CollideWithSphereMain.png)

## Block compatibility

This Block is compatible with the following Contexts:

- [Update](Context-Update.md)

## Block settings

| **Setting**       | **Type** | **Description**                                              |
| ----------------- | -------- | ------------------------------------------------------------ |
| **Mode**          | Enum     | The collision shape mode. The options are:<br/>&#8226; **Solid**: Particles cannot enter the collider.<br/>&#8226; **Inverted**: Particles cannot leave the collider. The collider becomes a volume that the particles cannot exit. |
| **Radius Mode**   | Enum     | The mode that determines the collision radius of each particle. The options are:<br/>&#8226; **None**: Particles have a radius of zero.<br/>&#8226; **From Size**: Particles inherit their radius from their individual sizes.<br/>&#8226; **Custom**: Allows you to set the radius of the particles to a specific value. |
| **Rough Surface** | Bool     | Toggles whether or not the collider simulates a rough surface. When enabled, Unity adds randomness to the direction in which particles bounce back to simulate collision with a rough surface. |

## Block properties

| **Input**         | **Type**                 | **Description**                                              |
| ----------------- | ------------------------ | ------------------------------------------------------------ |
| **Sphere**        | [Sphere](Type-Sphere.md) | The sphere that specifies the center position and radius of the collision volume. |
| **Bounce**        | Float                    | The amount of bounce to apply to particles after a collision. A value of 0 means the particles do not bounce. A value of 1 means particles bounce away with the same speed they impacted with. |
| **Friction**      | Float                    | The speed that particles lose during collision. The minimum value is 0. |
| **Lifetime Loss** | Float                    | The proportion of life a particle loses after collision.     |
| **Roughness**     | Float                    | The amount to randomly adjust the direction of a particle after it collides with the surface.<br/>This property only appears when you enable **Rough Surface**. |
| **Radius**        | Float                    | The radius of the particle this Block uses for collision detection.<br/>This property only appears when **Radius Mode** is set to **Custom**. |

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