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This page describes each of the Select By blocks that you can use in the Visual Dataprep system to identify scene elements that you want to carry out operations on.

Each type of Select By block offers a different set of criteria that you can fill in. When the Visual Dataprep system carries out each action in your Dataprep graph, it at first assumes that all operations defined in that action should apply to all Actors and all Assets in the imported scene. However, if your action contains any of the Select By blocks described on this page, the Visual Dataprep system checks each of those scene elements to see if it matches the criteria you've set up in the Select By block. If the scene element doesn't satisfy your criteria, the Visual Dataprep system removes that element from the list of scene elements it applies operations to for the current action. For more background information, see the Visual Dataprep Overview .

Inverting Filter Logic

You can invert any Select By block to turn it into an Exclude By block. This reverses the selection logic, so that the operations in the same step will apply only to the set of scene elements that do not match the criteria you set.

To do this, right-click the block and select Filter > Inverse Selection from the context menu.

Select By Condition

Select By Condition blocks select a scene element only if a given condition is true for that element.

Is Class Of

Use the Is Class Of block to select a scene element only if its Class after import into Unreal Engine matches the Class name that you specify in the Class setting.

Select By Float

Select By Float blocks select scene elements only if some numeric property of those scene elements is Less Than , Greater Than , or Is Nearly Equal to a given threshold value.

Bounding Volume

Use the Bounding Volume block to select a scene element only if it has extents in 3D space (and therefore a bounding box), and only if the total volume of that bounding box satisfies the comparison you specify in the settings.

For example, suppose a Static Mesh has a bounding volume that is 100 centimeters by 100 centimeters. The volume of its bounding box is 100x100, or 10000 cubic centimeters. Therefore, this block would select that Static Mesh if you set it to Less Than any number larger than 10000, or Greater Than any number below 10000.

Select By String

Select By String blocks select scene elements only if a given string property of those scene elements match a string pattern that you specify.

These blocks offer four string comparisons:

Actor Label

Use the Actor Label block to select Actors in the Dataprep preview scene—that is, any items shown in the World Outliner Preview panel—only if the string that you specify matches the names that you see assigned to those Actors in the World Outliner Preview .

Has Actor Tag

Use the Has Actor Tag block to select a scene element only if it possesses the Actor tag you specify in the Tag setting.

For example, if your Actor is imported with the following set of tags:

You could select this Actor in your Has Actor Tag block by setting the value of the Key setting to Max.superclassof: GeometryClass , Max.classof: EditablePolyMesh , Max.handle: 407 , or any other value shown in the list above.

For more information on the Actor tags imported by Datasmith, see About the Datasmith Import Process .

Metadata Value

Use the Metadata Value block to select Actors in the Dataprep preview scene—that is, any items shown in the World Outliner Preview panel—only if the Actor has Datasmith Metadata with the Key you specify in the settings, and the value of that Datasmith Metadata key matches the string value you provide in the settings.

For example, suppose that you have an Actor that is assigned the following set of Datasmith Metadata after import:

If you set the Key value to Category , you could select this Actor by choosing the Contains operation and setting the string pattern in the third column to Floor or Floors .

For more about Datasmith Metadata, see Using Datasmith Metadata .

Object Name

Use the Object Name block to select Assets—that is, Static Meshes, Textures, Materials, and Animations listed in the Content Browser Preview panel—only if the string you specify matches the names that you see assigned to those Assets in the Content Browser Preview .