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TransformSnapshotTable

viewport_lib::runtime::snapshot

Struct TransformSnapshotTable 

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pub struct TransformSnapshotTable { /* private fields */ }
Expand description

Per-node transform snapshot table for rendering interpolation.

Keyed by NodeId. Lives inside super::ViewportRuntime, separate from the scene graph, so apps that do not use physics pay no overhead.

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impl TransformSnapshotTable

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pub fn update(&mut self, id: NodeId, transform: Affine3A)

Record a new transform for a node, shifting the current value to prev.

On the first call for a node, both prev and curr are set to transform to avoid a spurious lerp from the origin.

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pub fn get(&self, id: NodeId) -> Option<&TransformSnapshot>

Get the raw snapshot for a node.

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pub fn interpolated(&self, id: NodeId, alpha: f32) -> Option<Affine3A>

Compute the interpolated transform for a node at blend factor alpha.

alpha comes from FixedTimestep::alpha: 0.0 returns prev, 1.0 returns curr, values between lerp translation and scale while slerping rotation.

Returns None if no snapshot exists for the node.

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pub fn remove(&mut self, id: NodeId)

Remove the snapshot for a node.

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pub fn clear(&mut self)

Clear all snapshots.

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pub fn len(&self) -> usize

Number of nodes tracked.

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pub fn is_empty(&self) -> bool

Whether the table is empty.

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