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          Using the Geometry Cache Track

          Describes how you can add and use the Geometry Cache Track to scrub through and utilize Geometry Cache assets within Sequencer.

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          The new (and experimental) Geometry Cache Track enables?you to scrub through a Geometry Cache and render it out with frame accuracy. Once you have imported your Alembic file into Unreal Engine 4 (UE4)?and added it to a Level, you can add it to a Level Sequence and add the Geometry Cache Track to play your content.

          Steps

          For this How-to guide, we are using the?Blueprint Third Person?template project. You will also need an Alembic file to import into the Engine. If you do not have your own asset, download this?Sample File .

          1. Import your?Alembic file(s) into UE4 as a?Geometry Cache and define your desired settings.

            UsingGeometryCache_ImportWindow.png

          2. Place your Geometry Cache?in the Level, then create a Level Sequence and add it to Sequencer with the?+ Track button.?

            GeoCache_02.png

          3. Click the?+ Track?button for the newly created Track and select?Geometry Cache?from the?Tracks?menu.?

            GeoCache_03.png

          4. Scrub the Timeline?to view a?playback.

            GeometryCache_Example.png

            You can also set the Level Sequence to Auto Play before selecting Play in the Level.

          End Result

          With the?Geometry Cache?Track?**set, you can scrub through your content or it will play back automatically when your Level Sequence plays.?

          You can access the properties of the?Geometry Cache by right-clicking on the Track in the?Tracks?Window. From the properties menu,?you can change which?Geometry Cache?asset is being used, add a?Start?or?End?Offset,?or adjust the?Play Rate.?There are also options for the?Section?itself?and whether to play the animation in?Reverse**.?

          GeoCache_04.png

          The following properties are available for Geometry Cache tracks from the right-click context menu, under?Properties:?

          Property

          Description

          Geometry Cache

          Specifies the Geometry Cache asset to play.

          Start Offset

          Number of frames to offset into the beginning of the animation clip.

          End Offset

          Number of frames to offset into the end of the animation clip.

          Play Rate

          Defines the playback rate of the animation clip (lower to slow down, increase to speed up).

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