Is Unique id actually unique across all nodes, textures, materials, etc

vtranduc · November 11, 2022, 7:25pm

Hello,

I am working on a project that allows user to select object and all of that. I am using unique id system to identify nodes, materials, etc.

I am wondering, is it unique across the entire entire scene? For example, can a mesh and a material have the same unique ids?

Thank you!

labris · November 11, 2022, 10:49pm

UID function is here - Babylon.js/guid.ts at 7dca66b3127dfb5e0614f4e539a2e8a655d3e7b5 · BabylonJS/Babylon.js · GitHub

Seems that it works on the scene level (this._scene.getUniqueId();), as example -

github.com

BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Materials/material.ts#L872


      
          

          this._dirtyCallbacks[Constants.MATERIAL_TextureDirtyFlag] = this._markAllSubMeshesAsTexturesDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_LightDirtyFlag] = this._markAllSubMeshesAsLightsDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_FresnelDirtyFlag] = this._markAllSubMeshesAsFresnelDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_AttributesDirtyFlag] = this._markAllSubMeshesAsAttributesDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_MiscDirtyFlag] = this._markAllSubMeshesAsMiscDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_PrePassDirtyFlag] = this._markAllSubMeshesAsPrePassDirty.bind(this);

          this._dirtyCallbacks[Constants.MATERIAL_AllDirtyFlag] = this._markAllSubMeshesAsAllDirty.bind(this);

          

          this.id = name || Tools.RandomId();

          this.uniqueId = this._scene.getUniqueId();

          this._materialContext = this._scene.getEngine().createMaterialContext();

          this._drawWrapper = new DrawWrapper(this._scene.getEngine(), false);

          this._drawWrapper.materialContext = this._materialContext;

          

          if (this._scene.useRightHandedSystem) {

              this.sideOrientation = Material.ClockWiseSideOrientation;

          } else {

              this.sideOrientation = Material.CounterClockWiseSideOrientation;

          }

sebavan · November 13, 2022, 5:07pm

It is actually even unique for the entire tab accross all engines

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Is Unique id actually unique across all nodes, textures, materials, etc

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