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For the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in UnityEvent and inside this event check if the player presses the "E" key.

Remember that you have to give the trigger GameObject a Tag in order to check if the trigger your staying in is the one you want.

void OnTriggerEnter(Collision col)
{
    if(col.gameObject.tag == "SomeTag" && Input.GetKey(KeyCode.E))
    {
        Animator anim;
        anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}

For the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in MonoBehaviour Message handler, and inside this handler check if the player presses the "E" key.

To check if the trigger you're staying in is the one you want, you can give the trigger a tag (or put it on a specific layer, or attach a specific "Activation" component, etc.)

void OnTriggerStay(Collision col)
{
    if(Input.GetKeyDown(KeyCode.E) && col.gameObject.CompareTag("SomeTag"))
    {
        Animator anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}

For the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in UnityEvent and inside this event check if the player presses the "E" key.

Remember that you have to give the trigger GameObject a Tag in order to check if the trigger your staying in is the one you want.

void OnTriggerEnter(Collision col) {
    if(col.gameObject.tag == "SomeTag" && Input.GetKey(KeyCode.E)) {
        Animator anim;
        anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}

For the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in UnityEvent and inside this event check if the player presses the "E" key.

Remember that you have to give the trigger GameObject a Tag in order to check if the trigger your staying in is the one you want.

void OnTriggerEnter(Collision col) 
{
    if(col.gameObject.tag == "SomeTag" && Input.GetKey(KeyCode.E))
    {
        Animator anim;
        anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}

for the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in UnityEvent and inside this event check if the player hits "E". remember that you have to give the trigger GameObject a Tag in order to check if the trigger your staying in is the one you want.

    void OnTriggerEnter(Collision col)
 {
    if(col.gameObject.tag == "SomeTag" && Input.GetKey(KeyCode.E))
    {
        Animator anim;
        anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}

For the inside trigger and only trigger and nothing but the trigger part you can use OnTriggerStay(Collider) function which is a built-in UnityEvent and inside this event check if the player presses the "E" key.

Remember that you have to give the trigger GameObject a Tag in order to check if the trigger your staying in is the one you want.

void OnTriggerEnter(Collision col) {
    if(col.gameObject.tag == "SomeTag" && Input.GetKey(KeyCode.E)) {
        Animator anim;
        anim = this.gameObject.GetComponent<Animator>();
        anim.Play("SomeAnim");
        DoFade();
    }
}