void LookAtEntity()
{
var parentFromEntity = GetComponentDataFromEntity <Parent>(true);
var lookFromEntity = GetComponentDataFromEntity <LookAtEntity>(true);
Entities
.WithReadOnly(parentFromEntity)
.WithReadOnly(lookFromEntity)
.ForEach((Entity entity, int entityInQueryIndex, ref Rotation rotation, in LookAtEntity lookAt) => {
if (!HasComponent <LocalToWorld>(entity) || !HasComponent <LocalToWorld>(lookAt.Value))
{
return;
}
// Avoid multiple nested rotations
if (TransformUtility.ExistsInHierarchy(entity, parentFromEntity, lookFromEntity))
{
return;
}
var sourcePos = GetComponent <LocalToWorld>(entity).Value.Position();
var targetPos = GetComponent <LocalToWorld>(lookAt.Value).Value.Position();
var forward = math.normalize(sourcePos - targetPos);
var up = math.normalize(GetComponent <LocalToWorld>(lookAt.Value).Value.Up());
if (!forward.Equals(up) && math.lengthsq(forward + up) != 0)
{
rotation.Value = quaternion.LookRotation(forward, up);
}
}).ScheduleParallel();
}
public void Execute(Entity entity, int index, [ReadOnly, ChangedFilter] ref LookAtPosition lookAt, [WriteOnly] ref LocalToWorld localToWorld)
{
if (!LocalToWorldFromEntity.Exists(entity))
{
return;
}
// Avoid multiple nested rotations
if (TransformUtility.ExistsInHierarchy(entity, ParentFromEntity, LookFromEntity))
{
return;
}
var sourcePos = LocalToWorldFromEntity[entity].Value.Position();
var forward = math.normalize(sourcePos - lookAt.Value);
var up = forward.Up();
localToWorld.Value = math.mul(new float4x4(quaternion.LookRotation(forward, up), localToWorld.Position),
float4x4.Scale(localToWorld.Value.Scale()));
}
public void Execute(ArchetypeChunk chunk, int chunkIndex, int firstEntityIndex)
{
var localToWorldChunkChanged = chunk.DidChange(LocalToWorldType, LastSystemVersion);
if (ChangedLookAtEntities.Length == 0 && !localToWorldChunkChanged)
{
return;
}
var lookAtArray = chunk.GetNativeArray(LookAtType);
var localToWorldArray = new NativeArray <LocalToWorld>();
for (var i = 0; i < chunk.Count; ++i)
{
var lookAtEntity = lookAtArray[i].Value;
if (!LocalToWorldFromEntity.Exists(lookAtEntity))
{
continue;
}
// Avoid multiple nested rotations
if (TransformUtility.ExistsInHierarchy(lookAtEntity, ParentFromEntity, LookFromEntity))
{
continue;
}
if (!localToWorldChunkChanged && !ChangedLookAtEntities.ContainsKey(lookAtEntity))
{
continue;
}
localToWorldArray = localToWorldArray.IsCreated ? localToWorldArray : chunk.GetNativeArray(LocalToWorldType);
var localToWorld = localToWorldArray[i];
var forward = math.normalize(LocalToWorldFromEntity[lookAtEntity].Value.Forward());
var up = math.normalize(LocalToWorldFromEntity[lookAtEntity].Value.Up());
if (!math.cross(forward, up).Equals(float3.zero))
{
localToWorldArray[i] = new LocalToWorld {
Value = math.mul(new float4x4(quaternion.LookRotation(forward, up), localToWorld.Position),
float4x4.Scale(localToWorld.Value.Scale()))
}
}
;
}
}
}
public void Execute(Entity entity, int index, [ReadOnly] ref LookAtEntity lookAt, [WriteOnly] ref Rotation rotation)
{
if (!LocalToWorldFromEntity.Exists(entity) || !LocalToWorldFromEntity.Exists(lookAt.Value))
{
return;
}
// Avoid multiple nested rotations
if (TransformUtility.ExistsInHierarchy(entity, ParentFromEntity, LookFromEntity))
{
return;
}
var sourcePos = LocalToWorldFromEntity[entity].Value.Position();
var targetPos = LocalToWorldFromEntity[lookAt.Value].Value.Position();
var forward = math.normalize(sourcePos - targetPos);
var up = math.normalize(LocalToWorldFromEntity[lookAt.Value].Value.Up());
if (!forward.Equals(up) && math.lengthsq(forward + up) != 0)
{
rotation.Value = quaternion.LookRotation(forward, up);
}
}