Entity Translation Value From Mouse Position (Raycast)

Unity Engine
,
1

I am experimenting with raycast with ECS 0.50. I’m trying to see if the mouse position on a surface can be known. I thought if I could reach that surface, maybe I could even create an object on surface too. With the code below, the entity is followed at the intersection of the mouse position and the surface,it is working in play mode but nothing happens when buildandrun is done. Is this a bug? Or are there some hidden option I need to check before buildandrun?

using Unity.Collections;
using Unity.Entities;
using Unity.Mathematics;
using Unity.Physics;
using Unity.Physics.Systems;
using Unity.Transforms;
using UnityEngine;
using RaycastHit = Unity.Physics.RaycastHit;

[AlwaysUpdateSystem]
public partial class UnitSelectionSystem : SystemBase
{
    private Camera _mainCamera;
    private BuildPhysicsWorld _buildPhysicsWorld;
    private CollisionWorld _collisionWorld;

    protected override void OnCreate()
    {
        _mainCamera = Camera.main;
        _buildPhysicsWorld = World.GetOrCreateSystem<BuildPhysicsWorld>();
    }

    protected override void OnUpdate()
    {
        Entities
            .WithAll<Move>()
            .WithoutBurst()
            .ForEach((ref Translation translation) =>
        {
        _collisionWorld = _buildPhysicsWorld.PhysicsWorld.CollisionWorld;

        var ray = _mainCamera.ScreenPointToRay(Input.mousePosition);
        var rayStart = ray.origin;
        var rayEnd = ray.GetPoint(100f);

            if (Raycast(rayStart, rayEnd, out var raycastHit))
            {
                var hitEntity = _buildPhysicsWorld.PhysicsWorld.Bodies[raycastHit.RigidBodyIndex].Entity;
                translation.Value = raycastHit.Position;
            }
        }).Run();

code take from this video.

2

I almost found the solution. Thanks

3

Are you building your build using the entities platforms package?
https://docs.unity3d.com/Packages/com.unity.entities@0.50/manual/ecs_building_projects.html

Are other systems working in your build? Are you building to Windows? Any errors in the log?

I don’t know any special settings for physics to be done only in editor, so I would assume the editor working stuff also works in build.

4

Thank you. I also found this page. Firstly i tried the video project. After build, when i click capsules, NullReferance error was written in console. I haven’t tried mouse position to entity translation value yet.