Understanding ShaderMaterial in Three.js

The errors you're encountering are related to how custom properties work with Three.js materials. When working with ShaderMaterial in Three.js, custom properties like falloff, glowColor, glowInternalRadius, and glowSharpness need to be properly defined in the shader's uniforms.

Why You're Seeing These Errors

The ShaderMaterial class in Three.js doesn't automatically recognize custom properties that aren't part of its standard properties. Instead, custom values need to be passed through the uniforms object when creating the material.

How to Fix It

When using a custom shader material like the one from the fake-glow-material repository, you need to:

1. Make sure you're properly initializing the material with uniforms
2. Pass custom properties through the uniforms object rather than setting them directly on the material

Here's how you might properly initialize a shader material with custom properties:

JAVASCRIPTCopied
const material = new THREE.ShaderMaterial({
  uniforms: {
    falloff: { value: 0.5 },
    glowColor: { value: new THREE.Color(0xff0000) },
    glowInternalRadius: { value: 0.1 },
    glowSharpness: { value: 1.0 }
  },
  vertexShader: myVertexShader,
  fragmentShader: myFragmentShader
});

Working with Custom Materials

If you're using a custom material class that extends ShaderMaterial, make sure you're:

1. Following the implementation pattern from the repository
2. Using the material as intended by the author
3. Checking if the repository has specific instructions for vanilla JS usage (as some might be designed primarily for frameworks)

For the specific fake-glow-material, you might need to look at how the author has implemented the uniform definitions and make sure you're initializing the material correctly according to their documentation.

If you need more specific help, consider sharing how you're currently initializing and using the material in your code.