UnityGame/Library/PackageCache/com.unity.shadergraph/Documentation~/HD-Sample-Buffer-Node.md

HD Sample Buffer Node

Description

The HD Sample Buffer Node samples a buffer directly from the Camera.

Render pipeline compatibility

Node	Universal Render Pipeline (URP)	High Definition Render Pipeline (HDRP)
HD Sample Buffer	No	Yes

Ports

Name	Direction	Type	Binding	Description
UV	Input	Vector 2	UV	Input UV value.
Sampler	Input	SamplerState	None	Determines the sampler that Unity uses to sample the buffer.
Layer Mask	Input	Float	None	Set the number of the Layer to sample. This port appears when you select Thickness in the Source Buffer dropdown.
Output	Output	Changes to one of the following depending on the Source Buffer you select: • Float • Vector 2 • Vector 3 • Vector 4	None	Output value.
Thickness	Output	Float	None	Sample the Worldspace value, in meters, between the near and the far plane of the camera.This port appears when you select Thickness in the Source Buffer dropdown.
Overlap Count	Output	Float	None	Count the number of triangles for a given pixel. This is useful for vegetation or flat surfaces. This port appears when you select Thickness in the Source Buffer dropdown.

Controls

Name	Type	Options	Description
Source Buffer	Dropdown	• NormalWorldSpace • Smoothness • MotionVectors • IsSky • PostProcessInput • RenderingLayerMask • Thickness	Determines which buffer to sample.

Generated Code Example

The following example code represents one possible outcome of this node:

float4 Unity_HDRP_SampleBuffer_float(float2 uv, SamplerState samplerState)
{
    return SAMPLE_TEXTURE2D_X_LOD(_CustomPostProcessInput, samplerState, uv * _RTHandlePostProcessScale.xy, 0);
}