MeshRenderSystem.cs

using Unity.Burst;
using Unity.Entities;
using Unity.Mathematics;
using Unity.Transforms;
using UnityEngine;

namespace Baking.BlobAssetBakingSystem
{
    [WorldSystemFilter(WorldSystemFilterFlags.Default | WorldSystemFilterFlags.Editor)]
    public partial struct MeshRenderSystem : ISystem
    {
        [BurstCompile]
        public void OnCreate(ref SystemState state)
        {
            state.RequireForUpdate<MeshBB>();
        }

        [BurstCompile]
        public void OnUpdate(ref SystemState state)
        {
            new DrawBBJob().ScheduleParallel();
        }
    }

    [BurstCompile]
    public partial struct DrawBBJob : IJobEntity
    {
        public void Execute(in MeshBB meshBB, in LocalToWorld t)
        {
            if (!meshBB.BlobData.IsCreated)
            {
                return;
            }

            var min = meshBB.BlobData.Value.MinBoundingBox;
            var max = meshBB.BlobData.Value.MaxBoundingBox;

            var pos = t.Position;

            // Draw a bounding box
            Debug.DrawLine(pos + new float3(min.x, min.y, min.z), pos + new float3(max.x, min.y, min.z));
            Debug.DrawLine(pos + new float3(min.x, max.y, min.z), pos + new float3(max.x, max.y, min.z));
            Debug.DrawLine(pos + new float3(min.x, min.y, min.z), pos + new float3(min.x, max.y, min.z));
            Debug.DrawLine(pos + new float3(max.x, min.y, min.z), pos + new float3(max.x, max.y, min.z));

            Debug.DrawLine(pos + new float3(min.x, min.y, max.z), pos + new float3(max.x, min.y, max.z));
            Debug.DrawLine(pos + new float3(min.x, max.y, max.z), pos + new float3(max.x, max.y, max.z));
            Debug.DrawLine(pos + new float3(min.x, min.y, max.z), pos + new float3(min.x, max.y, max.z));
            Debug.DrawLine(pos + new float3(max.x, min.y, max.z), pos + new float3(max.x, max.y, max.z));

            Debug.DrawLine(pos + new float3(min.x, min.y, min.z), pos + new float3(min.x, min.y, max.z));
            Debug.DrawLine(pos + new float3(max.x, min.y, min.z), pos + new float3(max.x, min.y, max.z));
            Debug.DrawLine(pos + new float3(min.x, max.y, min.z), pos + new float3(min.x, max.y, max.z));
            Debug.DrawLine(pos + new float3(max.x, max.y, min.z), pos + new float3(max.x, max.y, max.z));
        }
    }
}