Creating a clipping tool for a surface mesh

Question

I am trying to create a shader/material that once contacted with a specific mesh, it will reveal the inside of it, similar to this: enter image description here

So far, I have done it's creating a shader that apply to the mesh itself, but I don't want that because I don't want to change the material of the mesh.

enter image description here

Any ideas on how can I make a material apply to a sphere/plane that cut one specific mesh?

Answer 1

I think I managed to solve it.

using UnityEngine;
using System.Collections.Generic;

public class MeshClipper : MonoBehaviour
{
    public GameObject model3D;
    public Transform planeTransform;
    private Material cuttingMaterial;

    private void Awake() {
        MeshRenderer renderer = model3D.GetComponent<MeshRenderer>();
        cuttingMaterial = renderer.material;
    }

    void Update()
    {
        Vector3 planePosition = planeTransform.position;
        Vector3 planeNormal = planeTransform.up * -1;

        cuttingMaterial.SetVector("_PlanePosition", planePosition);
        cuttingMaterial.SetVector("_PlaneNormal", planeNormal);
    }
}