unity/Assets/Game/Scripts/Runs/TrainingCrate.cs

using System.Collections;
using UnityEngine;

namespace Ironspore
{
    public sealed class TrainingCrate : WorldInteractable
    {
        Transform hinge;
        Transform latch;
        const float UnlatchSeconds = .16f;
        const float LiftSeconds = .55f;
        bool started;
        public void Build(Transform world, Vector3 basePosition, bool part, bool showLabel)
        {
            Color accent = part ? new Color(.98f,.53f,.17f) : new Color(.16f,.85f,.67f);
            hinge = new GameObject("CaseHinge").transform;
            hinge.SetParent(world, false);
            hinge.position = basePosition + new Vector3(0,1.36f,.71f);
            var lid = WorldFactory.Box("CaseLid", hinge.position + Vector3.back * .72f, new Vector3(1.96f,.16f,1.49f), accent, hinge, false);
            lid.layer = 10;
            foreach (int side in new[] { -1, 1 })
                WorldFactory.Box("CaseStrap", lid.transform.position + new Vector3(side * .66f,.1f,0), new Vector3(.14f,.07f,1.42f), Color.gray, hinge, false).layer = 10;
            latch = new GameObject("CaseLatchPivot").transform;
            latch.SetParent(hinge, false);
            latch.localPosition = new Vector3(0, 0, -1.49f);
            WorldFactory.Box("CaseLatch", latch.position + Vector3.down * .13f, new Vector3(.38f, .26f, .09f), Color.gray, latch, false).layer = 10;
            WorldFactory.Box("CaseLiner", basePosition + Vector3.up * 1.30f, new Vector3(1.58f, .02f, 1.18f), new Color(.07f, .10f, .11f), world, false).layer = 10;
            if (showLabel)
                WorldFactory.Label(part ? "range.parts" : "range.material", basePosition + Vector3.up * 2.4f, accent, world);
        }

        public override void RefreshLabel()
        {
            if (collected && !started)
            {
                started = true;
                StartCoroutine(OpenLid());
            }
        }

        IEnumerator OpenLid()
        {
            float elapsed = 0;
            while (elapsed < UnlatchSeconds + LiftSeconds)
            {
                yield return null;
                elapsed += Time.deltaTime;
                latch.localRotation = Quaternion.Euler(Mathf.SmoothStep(0, 78, elapsed / UnlatchSeconds), 0, 0);
                hinge.localRotation = Quaternion.Euler(Mathf.SmoothStep(0, 92, (elapsed - UnlatchSeconds) / LiftSeconds), 0, 0);
            }
        }
    }
}