How to pass data from a vertex shader to a fragment shader in ThreeJS

Create a "varying" variable outside of both the vertex and fragment shader. Varyings allow you to set a value for this variable in the vertex shader that can be accessed in the fragment shader.

Oscar de la Hera Gomez
Written by Oscar de la Hera Gomez
First published on 11/06/2023 at 15:07
Last Updated on 11/11/2023 at 10:34
<p>Two flowers that represent ReactJs and ThreeJS. Beneath them sits the text "Pass Data from the Vertex Shader to the Fragment Shader."</p>

Create a "varying" variable outside of both the vertex and fragment shader. Varyings allow you to set a value for this variable in the vertex shader that can be accessed in the fragment shader.

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In order to pass data or variables from the vertex shader to the fragment shader in Three JS, you must:

  • Create a varying variable outside of the vertex and fragment function.
  • Set the varying variable in the vertex function.
  • Access it in the fragment function.

An example of this can be seen in the tutorial linked below that discusses how to add a light to a shader material in Three JS.

How to add lights to a material that uses a shader in ThreeJS

If you are looking for a more advanced solution that implements standard GLSL files, please consult the guide below.

How to use GLSL shaders in ReactJS & ThreeJS

Looking to learn more about ReactJS and ThreeJS ?

Search our blog to find educational content on learning how to use ReactJS and ThreeJS.

Search our BlogReact, ThreeJS & GLSL Resources

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