add time only animation for exporting

src/mol-plugin-state/animation/built-in/time.ts

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2026 mol* contributors, licensed under MIT, See LICENSE file for more info.
+ *
+ * @author Alexander Rose <alexander.rose@weirdbyte.de>
+ */
+
+import { ParamDefinition as PD } from '../../../mol-util/param-definition';
+import { PluginStateAnimation } from '../model';
+
+export const AnimateTime = PluginStateAnimation.create({
+    name: 'built-in.animate-time',
+    display: { name: 'Animate Time', description: 'Animate the passage of time in the 3D scene' },
+    isExportable: true,
+    params: () => ({
+        durationInMs: PD.Numeric(4000, { min: 100, max: 20000, step: 100 }),
+    }),
+    initialState: () => ({ }),
+    getDuration: p => ({ kind: 'fixed', durationMs: p.durationInMs }),
+
+    async apply(animState, t, ctx) {
+        return t.current < ctx.params.durationInMs
+            ? { kind: 'next', state: animState }
+            : { kind: 'finished' };
+    }
+});

src/mol-plugin/spec.ts

@@ -24,6 +24,7 @@ import { BoxifyVolumeStreaming, CreateVolumeStreamingBehavior, InitVolumeStreami
 import { AnimateStateInterpolation } from '../mol-plugin-state/animation/built-in/state-interpolation';
 import { AnimateStructureSpin } from '../mol-plugin-state/animation/built-in/spin-structure';
 import { AnimateCameraRock } from '../mol-plugin-state/animation/built-in/camera-rock';
+import { AnimateTime } from '../mol-plugin-state/animation/built-in/time';
 
 export { PluginSpec };
 
@@ -145,6 +146,7 @@ export const DefaultPluginSpec = (): PluginSpec => ({
         AnimateStateSnapshotTransition,
         AnimateAssemblyUnwind,
         AnimateStructureSpin,
-        AnimateStateInterpolation
+        AnimateStateInterpolation,
+        AnimateTime
     ]
 });