Rasagar/Library/PackageCache/com.unity.visualeffectgraph/Documentation~/Block-CollideWithDepthBuffer.md

Collide with Depth Buffer

Menu Path : Collision > Collide with Depth Buffer

The Collide with Depth Buffer Block makes particles collide with a specific Camera’s depth buffer. This is especially useful for fast moving particles like sparks or rain drops where precise collision is not as important.

Important: For the Block to generate depth collision, the specified Camera must be enabled.

Block compatibility

This Block is compatible with the following Contexts:

• Update

Block settings

Setting	Type	Description
Camera	Enum	The method to decide which Camera to use to calculate depth collision. The options are: • Main: Uses the main Camera in the Scene. This requires a Camera in the Scene to have the MainCamera tag. • Custom: Allows you to specify a particular Camera to use.
Surface Thickness	Enum	The method to decide how to specify the thickness of the colliding surface. The options are: • Infinite: Sets the thickness of the colliding surface to be infinite. • Custom: Allows you to specify a particular thickness value.
Radius Mode	Enum	The mode that determines the collision radius of each particle. The options are: • None: Particles have a radius of zero. • From Size: Particles inherit their radius from their individual sizes. • 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
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. This property only appears when you enable Rough Surface.
Radius	Float	The radius of the particle this Block uses for collision detection. This property only appears when Radius Mode is set to Custom.
Camera	Camera	The Camera to use for generating the collision surface. This Block uses the depth buffer from this Camera to generate the collision surface. This property only appears when Camera is set to Custom.
Surface Thickness	Float	The thickness of the collision surface. This property only appears when Surface Thickness is set to Custom.

Limitations

When using the Opaque blend mode, particles write to the depth buffer. In this scenario, this block will make the particles collide with their own depth, leading to an unstable behavior.