尝试在实例化的预制件上应用 z 旋转未按预期工作

Question

我通过将光线投射到地形表面来按程序生成草地四边形，为了让它们看起来更自然，我想在 Z 轴上添加一个随机旋转，但我的每一次尝试都会完全疯狂地旋转草方块。

没有随机 z 旋转，草方块在地形上很好，但排列整齐，感觉不太自然

    void RaycastItem(ItemChunk itemChunk)
{
    RaycastHit hit;
    Vector3 randPosition = new Vector3(Random.Range(-gridSize/2, gridSize/2), -20, Random.Range(-gridSize/2, gridSize/2)) + itemChunk.coord;

    if (Physics.Raycast(randPosition, Vector3.down, out hit, raycastDistance))
    {
        Quaternion spawnRotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
        Vector3 overlapTestBoxScale = new Vector3(overlapTestBoxSize, overlapTestBoxSize, overlapTestBoxSize);

        Collider[] collidersInsideOverlapBox = new Collider[1];
        int numberOfCollidersFound = Physics.OverlapBoxNonAlloc(hit.point, overlapTestBoxScale, collidersInsideOverlapBox, spawnRotation, spawnedObjectLayer);

        if (numberOfCollidersFound == 0)
        {
            Pick(itemChunk, hit.point, spawnRotation);
        }
    }
}

void Pick(ItemChunk itemChunk, Vector3 positionToSpawn, Quaternion rotationToSpawn)
{
    int randomIndex = Random.Range(0, itemsToPickFrom.Length);
    GameObject item = itemsToPickFrom[randomIndex];
// this is one of the places I tried applying the random rotation
    rotationToSpawn *= Quaternion.Euler(item.transform.rotation.x, item.transform.rotation.y, item.transform.rotation.z + Random.Range(0, 360));

    GameObject clone = Instantiate(item, positionToSpawn, rotationToSpawn);

    clone.transform.parent = itemChunk.transform;
    Debug.Log(clone.transform.localScale);
}

这是正在发生的事情的图片

我的四元数转换有问题吗？这是 Instantiation 特有的吗？对于实际问题，我不得不将 Quad 放入 Empty 中以制作预制件，Quad 有 0 rotations/transforms 并且 Quad 有 90 度旋转。

Answer 1

试试这个：

rotationToSpawn = Quaternion.Euler(item.transform.rotation.x, item.transform.rotation.y, item.transform.rotation.z + Random.Range(-15, 15));

如果我明白你在做什么，你想让草在 z 轴上有轻微的旋转。应该这样做。如果项目已经有一个大的 z 旋转，你可以试试这个：

rotationToSpawn = Quaternion.Euler(item.transform.rotation.x, item.transform.rotation.y, Random.Range(-15, 15));

尝试在实例化的预制件上应用 z 旋转未按预期工作

trying to apply z rotation on instantiated prefab not working as expected

c#

unity3d

rotation

quaternions

raycasting