I’m struggling to find a way to do the following:
There are two entities. B is a child of A. A is bound to rotate with mouse movement. B SHOULD “stay upright in the world”.
I think what I need is to do a quaternion rotation from B’s up to “absolute world up, at B’s localToWorld.Position”.
Here’s a reference video to what I’m trying accomplish, but with ECS:
Thanks a ton in advance, for anyone that’s able to help!
Here is how you create a billboard system:
using UnityEngine;
using Unity.Entities;
using Unity.Mathematics;
using Unity.Transforms;
public class BillboardAuthoring : MonoBehaviour
{
[SerializeField] EMode _mode = EMode.YAxis;
#if UNITY_EDITOR
void OnDrawGizmos ()
{
UnityEditor.Handles.Label( transform.position , _mode.ToString() );
}
#endif
public class Baker : Baker<BillboardAuthoring>
{
public override void Bake ( BillboardAuthoring authoring )
{
Entity entity = this.GetEntity( authoring , TransformUsageFlags.WorldSpace );
if( authoring._mode==EMode.Basic ) AddComponent<IsBasicBillboard>( entity );
else if( authoring._mode==EMode.YAxis ) AddComponent<IsYAxisBillboard>( entity );
}
}
public enum EMode : byte
{
Basic , YAxis
}
}
[UpdateInGroup( typeof(PresentationSystemGroup) )]
[WorldSystemFilter( WorldSystemFilterFlags.Default | WorldSystemFilterFlags.Editor )]
[RequireMatchingQueriesForUpdate]
public partial struct BillboardBasicSystem : ISystem
{
public void OnUpdate ( ref SystemState state )
{
Camera cam = Camera.main;
if( cam==null ) return;
Transform cameraTransform = cam.transform;
float4x4 ltw = cameraTransform.localToWorldMatrix;
new Job{
C0 = ltw.c0 ,
C1 = ltw.c1 ,
C2 = ltw.c2 ,
}.ScheduleParallel();
}
[WithAll( typeof(IsBasicBillboard) )]
[Unity.Burst.BurstCompile]
public partial struct Job : IJobEntity
{
public float4 C0, C1, C2;
void Execute ( ref LocalToWorld transform )
{
transform.Value.c0 = C0;
transform.Value.c1 = C1;
transform.Value.c2 = C2;
}
}
}
[UpdateInGroup( typeof(PresentationSystemGroup) )]
[WorldSystemFilter( WorldSystemFilterFlags.Default | WorldSystemFilterFlags.Editor )]
[RequireMatchingQueriesForUpdate]
public partial struct BillboardYAxisSystem : ISystem
{
public void OnUpdate ( ref SystemState state )
{
Camera cam = Camera.main;
if( cam==null ) return;
new Job{
CameraPosition = cam.transform.position ,
}.ScheduleParallel();
}
[WithAll( typeof(IsYAxisBillboard) )]
[Unity.Burst.BurstCompile]
public partial struct Job : IJobEntity
{
public float3 CameraPosition;
void Execute ( ref LocalToWorld transform )
{
// z
float3 position = transform.Position;
float3 target = new float3( CameraPosition.x , position.y , CameraPosition.z );
float zscale = math.length( transform.Value.c2 );
float3 z = -math.normalize(target-position);
transform.Value.c2 = new float4( z * zscale , 0 );
// y
float yscale = math.length( transform.Value.c1 );
transform.Value.c1 = new float4(0,yscale,0,0);
// x
float3 x = new float3( transform.Value.c0.x , transform.Value.c0.y , transform.Value.c0.z );
float xscale = math.length( transform.Value.c0 );
transform.Value.c0 = new float4( math.cross(z,new float3(0,1,0)) * xscale , 0 );
}
}
}
public struct IsBasicBillboard : IComponentData {}
public struct IsYAxisBillboard : IComponentData {}
Let GPU do this work via vertex shader. ECS/Burst are cool but no CPU involvement is almost always better 
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I need to use a job for this, so I can’t do regular mono behaviors. Here’s an example, that does not work.
[BurstCompile]
public partial struct SpriteBillboardJob : IJobEntity
{
public float3 CameraLocation;
public quaternion CameraRotation;
[BurstCompile]
private void Execute(ref LocalToWorld localToWorld, ref LocalTransform localTransform, SpriteBillboardTag spt)
{
localTransform.Rotation = Quaternion.FromToRotation(localTransform.Up(), localToWorld.Up);
}
}
Wow! Thanks Andrew, you’re an absolute god!! I didn’t look into the shader solution yet, but I’ll definitely look into that since I’ve heard that it’s a lot performant for this kind of feature.
Wanted to note out that, I had to disable the WoldSystemFilter(s) for some reason. Might be that my game project file is wonky, but it’s alright for now!
Thanks again, I’ve been at this for weeks and couldn’t figure out transform matrix updating 
Thanks for the third time!!
Good call and your project is fine. This particular WorldSystemFilter attribute setup makes this system run both in and out of play mode. This is the usual one:
[WorldSystemFilter( WorldSystemFilterFlags.Default | WorldSystemFilterFlags.Editor )]
And this is for Netcode-for-ECS projects:
[WorldSystemFilter( WorldSystemFilterFlags.ClientSimulation | WorldSystemFilterFlags.Editor )]
So my bad as I totally forgot to mention it.
Oh right yeah, I remember seeing something about the
– OksamiesNetcode-for-ECSfilters in this video: https://www.youtube.com/watch?v=8efRGtRCGJ0 I'll probably need that way later in my project, but good to know before hand. Thanks for clearing that up!