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