HandleUtility.placeObjectCustomPasses

描述

订阅此事件以处理场景视图中的对象放置。

当从层次结构和项目视图拖放对象时，PlaceObject会调用此委托。

using UnityEditor;
using UnityEngine;

static class PlaceObjectExample
{
    static readonly Plane s_GroundPlane = new Plane(Vector3.up, Vector3.zero);

    [InitializeOnLoadMethod]
    static void InitPlaceObjectHandler()
    {
        HandleUtility.placeObjectCustomPasses += PlaneRaycast;
    }

    // In this example, we register a plane at the scene origin to test for object placement.
    static bool PlaneRaycast(Vector2 mousePosition, out Vector3 position, out Vector3 normal)
    {
        Ray worldRay = HandleUtility.GUIPointToWorldRay(mousePosition);
        float distance;

        if (s_GroundPlane.Raycast(worldRay, out distance))
        {
            position = worldRay.GetPoint(distance);
            normal = s_GroundPlane.normal;
            return true;
        }

        position = Vector3.zero;
        normal = Vector3.up;
        return false;
    }
}