UnityGame/Library/PackageCache/com.unity.shadergraph/Documentation~/Sample-Texture-2D-LOD-Node.md

Sample Texture 2D LOD Node

Description

Samples a Texture 2D and returns a Vector 4 color value for use in the shader. You can override the UV coordinates using the UV input and define a custom Sampler State using the Sampler input. Use the LOD input to adjust the level of detail of the sample.

To use the Sample Texture 2D LOD Node to sample a normal map, set the Type dropdown parameter to Normal.

This Node is useful for sampling a Texture in the vertex Shader Stage as the Sample Texture 2D Node is unavailable in this Shader Stage.

On platforms that do not support this operation, opaque black is returned instead.

If you experience texture sampling errors while using this node in a graph which includes Custom Function Nodes or Sub Graphs, you can resolve them by upgrading to version 10.3 or later.

Ports

Name	Direction	Type	Binding	Description
Texture	Input	Texture 2D	None	Texture 2D to sample
UV	Input	Vector 2	UV	UV coordinates
Sampler	Input	Sampler State	Default sampler state	Sampler for the texture
LOD	Input	Float	None	Level of detail to sample
RGBA	Output	Vector 4	None	Output value as RGBA
R	Output	Float	None	red (x) component of RGBA output
G	Output	Float	None	green (y) component of RGBA output
B	Output	Float	None	blue (z) component of RGBA output
A	Output	Float	None	alpha (w) component of RGBA output

Controls

Name	Type	Options	Description
Type	Dropdown	Default, Normal	Selects the texture type

Generated Code Example

The following example code represents one possible outcome of this node per Type mode.

Default

float4 _SampleTexture2DLOD_RGBA = SAMPLE_TEXTURE2D_LOD(Texture, Sampler, UV, LOD);
float _SampleTexture2DLOD_R = _SampleTexture2DLOD_RGBA.r;
float _SampleTexture2DLOD_G = _SampleTexture2DLOD_RGBA.g;
float _SampleTexture2DLOD_B = _SampleTexture2DLOD_RGBA.b;
float _SampleTexture2DLOD_A = _SampleTexture2DLOD_RGBA.a;

Normal

float4 _SampleTexture2DLOD_RGBA = SAMPLE_TEXTURE2D_LOD(Texture, Sampler, UV, LOD);
_SampleTexture2DLOD_RGBA.rgb = UnpackNormalRGorAG(_SampleTexture2DLOD_RGBA);
float _SampleTexture2DLOD_R = _SampleTexture2DLOD_RGBA.r;
float _SampleTexture2DLOD_G = _SampleTexture2DLOD_RGBA.g;
float _SampleTexture2DLOD_B = _SampleTexture2DLOD_RGBA.b;
float _SampleTexture2DLOD_A = _SampleTexture2DLOD_RGBA.a;