Is there a way to clip an InstancedBufferGeometry? Below are the vertex and the fragment shaders i use.

```
// vertex shader
attribute vec3 instancePosition;
varying vec3 vColor;
varying vec3 vOriginalPos;
void main() {
vOriginalPos = position;
vColor = color;
vec3 transformedPos = position + instancePosition;
gl_Position = projectionMatrix * modelViewMatrix * vec4( transformedPos, 1.0 );
}
// fragment shader
varying vec3 vColor;
varying vec3 vOriginalPos;
void main() {
gl_FragColor = vec4( vColor, 1.0 );
}
```