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Use Specific Animation will open an option to select a specific Animation Sequence associated with your skeletal mesh to preview.
Live Link Preview Controller will use preview using Live Link settings.
Overview
Toolbar
Viewport
Editor Modes
Preview Scene Settings
Skeleton Editor
Skeletal Mesh Editor
Animation Sequence Editor
Preview Mesh
Set a new preview Skeletal Mesh for the current asset (Stored per-animation or per-skeleton).
Preview Animation
Select a preview animation for playback with the current asset.
Create Asset
From this drop down menu, the following Animation Assets can be created: Create Animation creates a new Animation Sequence from either the current default Reference Pose, or from the displayed meshes Current Pose. Create Pose Asset creates a new Pose Asset from either the Current Pose displayed on the mesh, the Current Animation description, or the Insert Pose Description. Anim Blueprint creates a new Animation Blueprint for the current Skeletal Mesh. Anim Composite created a new AnimComposite using the selected Skeleton. Anim Montage creates a new AnimMontage using the selected skeleton. Blend Space creates a new Blend Space used for smoothly blending transitions between animations. Blend Space 1D creates a new 1D Blend Space using the selected Skeleton. Aim Offset creates a new Aim Offset Blend Space using the selected skeleton. Aim Offset 1D creates a new Aim Offset 1D Blend Space using the selected skeleton.
Preview Animation
Lists the current selected animation sequence.
LOD (Level of Detail)
The current displayed LOD or Level of Detail assigned value of the character.
Current Screen Size
This is a value that represents how much of the viewport is occupied by the character's bounding box (By default, the bounding box is derived from the Physics Asset, if one is present, and Skeleton Asset if not.). Factors that affect this number are how large the animation's bounding box is (or the displacement in 3D space), how close the character is to the camera, and the amount of zoom applied to the camera. Based on this value you can assign when your LOD should switch between levels.
Triangles
Lists the number of triangles rendered that comprise the previewed mesh.
Vertices
Lists the number of vertices, or individual coordinate points, that comprise the previewed mesh.
UV Channels
Lists the current mesh's UV Channel.
Approximate Size
Dimensions of a bounding box containing the current animations displaced space, calculated by one of the animations assets. By default the physics asset will be used, and if no physics asset is present then the Skeleton asset will be referenced. Listed in Unreal Units (Centimeters).
Frame Rate
Lists the preview animations frame rate of playback.
Preview Controller
Here you have control over which animation is previewed in the viewport. Default will use the Animation tool's default settings. In most cases, this will cause the character to use the reference pose, except when an animation sequence is being viewed. Reference Pose will use the Skeletal Mesh's Reference Pose. Use Specific Animation will open an option to select a specific Animation Sequence associated with your skeletal mesh to preview. Live Link Preview Controller will use preview using Live Link settings.
Preview Mesh (Skeleton)
This property enables you to change the Skeletal Mesh used for previewing purposes. Only found in Skeleton Editor and Animation Editor.
Allow Different Skeletons
When this property is enabled you can select an additional mesh, even ones not associated with the current skeleton, to preview in the viewport. Only found in Skeleton Editor and Animation Editor.
Allow Custom AnimBP Override
If using a Preview Collection, you can enable this property to allow an override of custom Animation Blueprints. Only found in Skeleton Editor and Animation Editor
Additional Meshes
For use in instances of Mesh Collection implementation. View other meshes included in the current Mesh Collection for previewing purposes. Only found in Skeleton Editor and Animation Editor.
Skeletal Meshes
The Skeletal Mesh assets that are included in the specified Preview Mesh Collection. Only found in Skeleton Editor and Animation Editor.
Settings
General scene lighting and rendering settings.
Remarks