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Resolved Way to change MaterialMeshInfo inside IJobChunk?

Discussion in 'Graphics for ECS' started by MatanYamin, May 15, 2023.

  1. MatanYamin

    MatanYamin

    Joined:
    Feb 2, 2022
    Posts:
    110
    Hey everyone,

    Like the title says, I need to change the material id of entity's MaterialMeshInfo.

    The problem is, I can't use the ref MaterialMeshInfo inside IJobChunk Execute.

    How do I pass a query with the data to IJobChunk and then modify it inside?

    (Note: I know I can do this inside IJobEntity but I need to use Chunks).

    Thanks!
     
  2. LeFlop2001

    LeFlop2001

    Joined:
    Jan 30, 2020
    Posts:
    11
    the array you get from chunk.GetNativeArray points to inside the chunk, so you simply have to get a value, modify it and reassign it at the same index
    Code (CSharp):
    1.  
    2.     [BurstCompile]
    3.     public struct UpdateTranslationFromVelocityJob : IJobChunk
    4.     {
    5.         public ComponentTypeHandle<MaterialMeshInfo> MMTypeHandle;
    6.  
    7.         [BurstCompile]
    8.         public void Execute(in ArchetypeChunk chunk, int unfilteredChunkIndex, bool useEnabledMask, in v128 chunkEnabledMask)
    9.         {
    10.             NativeArray<MaterialMeshInfo> mmInfo = chunk.GetNativeArray(ref MMTypeHandle);
    11.  
    12.             var enumerator = new ChunkEntityEnumerator(useEnabledMask, chunkEnabledMask, chunk.Count);
    13.             while (enumerator.NextEntityIndex(out var i))
    14.             {
    15.                 var info = mmInfo[i];
    16.  
    17.                 info.Material++;
    18.  
    19.                 mmInfo[i] = info;
    20.             }
    21.         }
    22.     }
     
    MatanYamin likes this.
  3. MatanYamin

    MatanYamin

    Joined:
    Feb 2, 2022
    Posts:
    110
    Thank you so much! Just what I was looking for. Works great for me!