How to set MaterialPropertyBlock in Entities.ForEach

Question

Hi, I would like to change the shader property "_Fill" but seems I need to have access to Renderer. I'm new in this, please help:)

     Entities
    .WithAll<HealthBar, Parent>()
    .ForEach((Entity e, RenderMesh renderMesh) =>
    {
        var parent = EntityManager.GetComponentData<Parent>(e);
        var hp = EntityManager.GetComponentData<Health>(parent.Value);
        var valueHP = hp.value / 100;

        //1. I would like to change shader property
        MaterialPropertyBlock mpb = new MaterialPropertyBlock();
        //Renderer renderer = new Renderer();
        //renderer.GetPropertyBlock(mpb);
        mpb.SetFloat("_Fill", valueHP);
        //renderer.SetPropertyBlock(mpb);

        //2. below setFloat works but it's on material, need to do the same on shader level
        //renderMesh.material.SetFloat("_Fill", valueHP );
    }).WithoutBurst().Run();

Answer 1

Best Answer

Answer by andrew-lukasik · Sep 29, 2020 at 07:23 PM

 [MaterialProperty( "_Fill" , MaterialPropertyFormat.Float )]
 public struct FillMaterialProperty : IComponentData
 {
     public float Value;
 }

 var healthData = GetComponentDataFromEntity<Health>();
 uint systemVersion = LastSystemVersion;
 Entities
     .WithName("update_fill_property_job")
     .WithAll<HealthBar>()
     .WithReadOnly( healthData )
     .ForEach( ( ref FillMaterialProperty fill , in Parent parent ) =>
     {
         if( healthData.DidChange(parent.Value,systemVersion) )
         {
             var hp = healthData[ parent.Value ];
             fill.Value = hp.value / 100f;
         }
     } )
     .WithBurst().ScheduleParallel();

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andrew-lukasik · Sep 29, 2020 at 07:37 PM 1

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PS: Dla shader level jest Shader.SetGlobalFloat

rafal_b · Sep 30, 2020 at 11:05 PM 0

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Hi, @andrew-lukasik (Andrzej right?:) I haven't noticed that you already replied. Thank you!

In the meantime, I figured out that I need to use the components and $$anonymous$$aterialProperty attribute instead of trying to use $$anonymous$$aterialPropertyBlock. So the same as you wrote but I couldn't get it how I can assign my component data to entity and query it in the .ForEach without adding it explicitly to the Entity in the editor, that's why I added [GenerateAuthoringComponent] as well. I guess I should do it in the Authoring class by 'myEntity$$anonymous$$anager'.AddComponentData(...). Not always 'brute force' mode as I did, trying to learn how things working and achieve goals is the best ;)

I will try your proposal on how to fill the value, thanks for your reply one more time!

 [GenerateAuthoringComponent]
 [$$anonymous$$aterialProperty("_Fill", $$anonymous$$aterialPropertyFormat.Float)]
 public struct HealthBarFill : IComponentData
 {
     public float Value;
 }

 public class HealthBarSystem : SystemBase
 {
     protected override void OnUpdate()
     {
  Entities
             .WithAll<HealthBar, Parent>()
             .ForEach((Entity e, ref HealthBarFill healthBarFill) =>
             {
                 var parent = Entity$$anonymous$$anager.GetComponentData<Parent>(e);
                 var hp = Entity$$anonymous$$anager.GetComponentData<Health>(parent.Value);
                 healthBarFill.Value = hp.value;
 
             }).WithoutBurst().Run();
 }

How to set MaterialPropertyBlock in Entities.ForEach

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