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Unity Engine

Surface Shader input structure reference for the Built-In Render Pipeline

Reference for the input structure of a Surface Shader.
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중요
The Built-In Render Pipeline is deprecated and will be made obsolete in a future release.
It remains supported, including bug fixes and maintenance, through the full Unity 6.7 LTS lifecycle.
The Universal Render Pipeline (URP) doesn't support surface shaders. For more information on how to replace surface shaders in URP, refer to Convert custom shaders for URP compatibility.
The input structure 
Input
generally has any texture coordinates needed by the shader. Texture coordinates must be named "
uv
" followed by texture name (or start it with "
uv2
" to use second texture coordinate set).
Additional values that can be put into Input structure:
  • float3 viewDir
    - contains view direction, for computing Parallax effects, rim lighting etc.
  • float4
    with 
    COLOR
    semantic - contains interpolated per-vertex color.
  • float4 screenPos
    - contains screen space position for reflection or screenspace effects. Note that this is not suitable for GrabPass; you need to compute custom UV yourself using 
    ComputeGrabScreenPos
    function.
  • float3 worldPos
    - contains world space position.
  • float3 worldRefl
    - contains world reflection vector if surface shader does not write to o.Normal. See Reflect-Diffuse shader for example.
  • float3 worldNormal
    - contains world normal vector if surface shader does not write to o.Normal.
  • float3 worldRefl; INTERNAL_DATA
    - contains world reflection vector if surface shader writes to o.Normal. To get the reflection vector based on per-pixel normal map, use 
    WorldReflectionVector (IN, o.Normal)
    . See Reflect-Bumped shader for example.
  • float3 worldNormal; INTERNAL_DATA
    - contains world normal vector if surface shader writes to o.Normal. To get the normal vector based on per-pixel normal map, use 
    WorldNormalVector (IN, o.Normal)
    .