I’m trying to get the normal vector into the fragment to fake a light on the shader, but the vector is always (0.0, 0.0, 0.0).

This is a basic shader to test the normal vector, but it’s a black box.

```
const material = new THREE.ShaderMaterial({
vertexShader: `
varying vec3 vNormal;
varying vec3 vPosition;
void main() {
vPosition = position;
vec3 vNormal = normal;
gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
}
`,
fragmentShader: `
varying vec3 vNormal;
varying vec3 vPosition;
void main() {
gl_FragColor = vec4(vNormal, 1.0);
}
`,
});
```

This is the fragment shader that fakes a light using a vector and calculating the dot product of the light and the normal to display or not color, but it’s still a black box.

```
// same name and type as VS
varying vec3 vNormal;
void main() {
// calc the dot product and clamp
// 0 -> 1 rather than -1 -> 1
vec3 light = vec3(0.5,0.2,1.0);
// ensure it's normalized
light = normalize(light);
// calculate the dot product of
// the light to the vertex normal
float dProd = max(0.0, dot(vNormal, light));
// feed into our frag colour
gl_FragColor = vec4(dProd, dProd, dProd, 1.0);
}
```

Any thoughts?