EntitiesSample_9. CrossQuery

该示例主要的内容：

1.URPMaterialPropertyBaseColor：Unity.Rendering空间下的材质组件，该结构体拥有一个float4颜色的变量，赋值和其他的组件一样

2.EntityQuery转数组

boxQuery.ToComponentDataArray<LocalTransform>(Allocator.Temp);

3.IJobChunk的使用

复制代码

  new CollisionJob
            {
                //获取LocalTransform组件的句柄
                LocalTransformTypeHandle = SystemAPI.GetComponentTypeHandle<LocalTransform>(true),
                //获取DefaultColor组件的句柄
                DefaultColorTypeHandle = SystemAPI.GetComponentTypeHandle<DefaultColor>(true),
                //获取URPMaterialPropertyBaseColor组件的句柄
                BaseColorTypeHandle = SystemAPI.GetComponentTypeHandle<URPMaterialPropertyBaseColor>(),
                //获取实体类型的句柄
                EntityTypeHandle = SystemAPI.GetEntityTypeHandle(),
                //实体查询对象转化为数组句柄
                OtherChunks = boxQuery.ToArchetypeChunkArray(state.WorldUpdateAllocator)
                //作业调度，   Complete()：需要全部完成，然后执行下一次 
            }.ScheduleParallel(boxQuery, state.Dependency).Complete();

特别注意的是IJobChunk接口中的句柄变量，都需要 [ReadOnly]标签修饰，例如：

ReadOnly\] public ComponentTypeHandle\ LocalTransformTypeHandle; 在Chunk作业中，需要使用ArchetypeChunk chunk获取当前要操作的变量值，示例代码是这样的没什么好解释的，就是双循环判断距离 [BurstCompile] public struct CollisionJob : IJobChunk { [ReadOnly] public ComponentTypeHandle LocalTransformTypeHandle; [ReadOnly] public ComponentTypeHandle DefaultColorTypeHandle; public ComponentTypeHandle BaseColorTypeHandle; [ReadOnly] public EntityTypeHandle EntityTypeHandle; [ReadOnly] public NativeArray OtherChunks; public void Execute(in ArchetypeChunk chunk, int unfilteredChunkIndex, bool useEnabledMask, in v128 chunkEnabledMask) { var transforms = chunk.GetNativeArray(ref LocalTransformTypeHandle); var defaultColors = chunk.GetNativeArray(ref DefaultColorTypeHandle); var baseColors = chunk.GetNativeArray(ref BaseColorTypeHandle); var entities = chunk.GetNativeArray(EntityTypeHandle); for (int i = 0; i < transforms.Length; i++) { var transform = transforms[i]; var baseColor = baseColors[i]; var entity = entities[i]; // reset to default color baseColor.Value = defaultColors[i].Value; for (int j = 0; j < OtherChunks.Length; j++) { var otherChunk = OtherChunks[j]; var otherTranslations = otherChunk.GetNativeArray(ref LocalTransformTypeHandle); var otherEntities = otherChunk.GetNativeArray(EntityTypeHandle); for (int k = 0; k < otherChunk.Count; k++) { var otherTranslation = otherTranslations[k]; var otherEntity = otherEntities[k]; if (entity != otherEntity && math.distancesq(transform.Position, otherTranslation.Position) < 1) { baseColor.Value.y = 0.5f; // set green channel break; } } } baseColors[i] = baseColor; } } }