How to align objects to a model slope while working in Scene view?

Questions & Answers
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1

I have a simple question but somehow can’t find a way to solve it. I want this blue cube parallel to the grey slope. But I made the slope via Probuilder so it is just a model with no rotation. So I can’t set an angle to rotate the cube ( Also manually calculating the angle doesn’t work)

image
image1907×622 241 KB

2
  1. Add this script to your project
  2. Move this object over the slope
  3. Press Ctrl + g or click GameObject/Align To Ground

AlignToGroundMenuCommand.cs

#if UNITY_EDITOR
using UnityEngine;
using UnityEditor;

namespace EditorOnly
{
    public static class AlignToGroundMenuCommand
    {
        [MenuItem( "CONTEXT/GameObject/Align To Ground" )]
        public static void AlignToGround_ctx ( MenuCommand command )
        {
            GameObject gameObject = (GameObject) command.context;
            AlignToGround( gameObject );
        }

        [MenuItem( "GameObject/Align To Ground %g" )]
        public static void AlignToGround_cmd ()
        {
            foreach( var gameObject in Selection.gameObjects )
                AlignToGround( gameObject );
        }

        static void AlignToGround ( GameObject gameObject )
        {
            Undo.RegisterFullObjectHierarchyUndo( gameObject , nameof(AlignToGround) );
            Transform transform = gameObject.transform;

            var hits = Physics.RaycastAll( transform.position , Vector3.down , maxDistance:10f );

            foreach ( var hit in hits )
            if( hit.transform!=transform )
            {
                transform.position = hit.point;
                transform.rotation = Quaternion.LookRotation( Vector3.ProjectOnPlane(transform.forward,hit.normal).normalized , hit.normal );
                break;
            }
        }
    }
}
#endif