Getting the index of Entities.ForEach()

Unity Engine
,
1 
var tempBoidPositionArray =  m_BoidQuery.ToComponentDataArray<BoidPositionComponent>(Allocator.Temp);
        NativeArray<float3> boidPositions = new NativeArray<float3>(boidCount, Allocator.Temp);
       
        Entities.With(m_BoidQuery)
            .ForEach((
            ref BoidVelocityComponent movementVelocityComp,
            ref BoidPositionComponent boidPositionComp) => {
                boidPositions[entityIndex] = tempBoidPositionArray[entityIndex].position;
            });

Right now I do not know how to get the current entities index to make this happen

2

Use int entityInQueryIndex as described in https://docs.unity3d.com/Packages/com.unity.entities@0.14/manual/ecs_entities_foreach.html#special-named-parameters.

3 
Entities.With(m_BoidQuery)
            .ForEach((
            int entityInQueryIndex,
            ref BoidVelocityComponent movementVelocityComp,
            ref BoidPositionComponent boidPositionComp) => {
                boidPositions[entityInQueryIndex] = tempBoidPositionArray[entityInQueryIndex].position;
            });

The problem I get with using int entityInQueryIndex is that get the following error:

EntityQueryBuilder.F_E does not take 3 arguments

4

Use SystemBase, not ComponentSystem.

1 Like
5

My bad, I assumed you were using SystemBase.

6

No problem. All is well. Nice to have something simple fix my frustration

1 Like