feat: add Sequence speed multiplier to BasisAuthoredMotion

Basis/Packages/com.basis.framework/Drivers/AuthoredMotion/BasisAuthoredMotionSystem.cs

@@ -47,6 +47,7 @@ public struct AuthoredMovementData
     public int frameCount;       // frames for this slot's transform
     public float frameRate;      // samples per second
     public int loop;             // 0 = one-shot, 1 = loop
+    public float sequenceSpeed;  // playback rate multiplier (negative reverses)
 
     // Captured rest pose (local space); motion composes as a delta from this.
     public quaternion restRotation;
@@ -145,8 +146,18 @@ public void Execute(int index, TransformAccess transform)
                 if (m.frameCount <= 0) break;
                 float fr = m.frameRate > 1e-4f ? m.frameRate : 30f;
                 float length = m.frameCount / fr;
-                float pt = m.loop != 0 ? math.fmod(t, length) : math.min(math.max(t, 0f), length);
-                if (pt < 0f) pt += length; // fmod can return negative for negative t
+                float st = t * m.sequenceSpeed;
+                float pt;
+                if (m.loop != 0)
+                {
+                    pt = math.fmod(st, length);
+                    if (pt < 0f) pt += length; // fmod can return negative for negative t
+                }
+                else
+                {
+                    // Reverse one-shot walks the playhead down from the end; forward holds at 0..length.
+                    pt = math.clamp(m.sequenceSpeed < 0f ? length + st : st, 0f, length);
+                }
 
                 float frameF = pt * fr;
                 int f0 = (int)math.floor(frameF);
@@ -501,6 +512,7 @@ static Registration Build(BasisAuthoredMotion component)
                         d.frameCount = fc;
                         d.frameRate = clip.frameRate;
                         d.loop = mv.loop ? 1 : 0;
+                        d.sequenceSpeed = mv.sequenceSpeed;
                         AddSlot(data, targets, movementEnabled, d, tf, mv.enabled);
                     }
                     break;

Basis/Packages/com.basis.sdk/Localization/Languages/en.json

@@ -261,6 +261,8 @@
     { "key": "sdk.authoredMotion.field.keyframes.tooltip", "value": "Inline pose-delta timeline for short motion. Ignored when a Baked Clip is assigned." },
     { "key": "sdk.authoredMotion.field.loop.label", "value": "Loop" },
     { "key": "sdk.authoredMotion.field.loop.tooltip", "value": "Loop the sequence, or play it once." },
+    { "key": "sdk.authoredMotion.field.sequenceSpeed.label", "value": "Speed" },
+    { "key": "sdk.authoredMotion.field.sequenceSpeed.tooltip", "value": "Playback rate multiplier for the baked clip. 1 plays at authored speed, 2 plays twice as fast, 0.5 half speed; negative values play in reverse." },
 
     { "key": "sdk.buildReport.window.title", "value": "Basis Build Report Viewer" },
     { "key": "sdk.buildReport.window.tabTitle", "value": "Basis Bundle Report" },

Basis/Packages/com.basis.sdk/Scripts/BasisAuthoredMotion.cs

@@ -78,6 +78,7 @@ public enum Waveform { Sine, Triangle, Square, Pulse }
         public Keyframe[] keyframes = Array.Empty<Keyframe>();
         public BasisMotionClip bakedClip; // shared baked curves; null when using inline keyframes
         public bool loop = true;
+        public float sequenceSpeed = 1f; // playback rate multiplier (1 = authored speed); negative plays in reverse
 
         // Noise — simplex drift on `channel` about `axis`; reuses amplitude / chain / chainFalloff / seed; `noiseSpeed` = sample rate.
         public float noiseSpeed = 0.5f;

Basis/Packages/com.basis.sdk/Scripts/Editor/BasisAuthoredMotionEditor.cs

@@ -131,6 +131,7 @@ private void DrawMovementCard(SerializedProperty movements, int i,
                     Field(mv, "bakedClip", "bakedClip");
                     Field(mv, "sequenceRoot", "sequenceRoot");
                     Field(mv, "loop", "loop");
+                    Field(mv, "sequenceSpeed", "sequenceSpeed");
                     break;
             }