What are Varying or In/Out Variables in Shaders?
In Computer Graphics, the term "varying" or "in/out" refers to variables that are defined in the vertex shader and which are passed down to the fragment shader.
Varyings or in/out are vertex-specific data or variables that are defined by the vertex shader and which are passed down to the fragment shader.
When writing shaders, the syntax that is used is one of two:
- In the case of varying, varying must be used in both the vertex shader and the fragment shader.
- In the case of in/out, in must be used in the vertex shader and out must be used in the fragment shader.
Please note that regardless of whether you use in/out or varying, the variable name must be identical in both the vertex shader and the fragment shader.
For example uses of varying or in/out, consult the guides below.
Looking for tutorials on how to implement shaders?
For examples on how to implement shaders in WebGL and Metal (Apple), consult the guides below.
Looking to learn more about how computer graphics (CG) are rendered?
Consult our article below to learn more about how computer graphics are rendered.
Looking to learn more about Technology, Augmented Reality, Virtual Reality, Mixed Reality or Spatial Computing?
Search our blog to find educational content on technology, A/R, V/R, M/R and spatial computing.