MonoBehaviour.OnWillRenderObject()

Description

OnWillRenderObject is called for each camera if the object is visible and not a UI element.

Эта функция вызывается только если Behaviour включен.

The function is called during the culling process just before rendering each culled object. For usage in a proper context, see the script Water.cs in Assets->Import Package->Effects

Следует отметить то, что Camera.current будет установлена в той камере, которая будет рендерить объект.

Note: This has no effect when called from a UI element.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Renderer rend;
    void Start() {
        rend = GetComponent<Renderer>();
    }
    void OnWillRenderObject() {
        if (Camera.current.name == "MiniMapcam")
            rend.material.color = Color.red;
        else
            rend.material.color = Color.white;
    }
}

Also, this is called multiple times per frame.