Merge branch 'master' of https://github.com/BabylonJS/Babylon.js

src/Animations/babylon.runtimeAnimation.ts

@@ -391,7 +391,7 @@
          * @param loop defines if the current animation must loop
          * @param speedRatio defines the current speed ratio
          * @param weight defines the weight of the animation (default is -1 so no weight)
-         * @returns a boolean indicating if the animation has ended
+         * @returns a boolean indicating if the animation is running
          */
         public animate(delay: number, from: number, to: number, loop: boolean, speedRatio: number, weight = -1.0): boolean {
             let targetPropertyPath = this._animation.targetPropertyPath
@@ -400,21 +400,20 @@
                 return false;
             }
 
-            let keys = this._animation.getKeys();
-
-            // Return immediately if there is only one key frame.
-            if (keys.length === 1) {
-                this.setValue(keys[0].value, weight);
-                return !loop;
-            }
-
             var returnValue = true;
 
+            let keys = this._animation.getKeys();
+
             // Adding a start key at frame 0 if missing
             if (keys[0].frame !== 0) {
                 var newKey = { frame: 0, value: keys[0].value };
                 keys.splice(0, 0, newKey);
             }
+            // Adding a duplicate key when there is only one key at frame zero
+            else if (keys.length === 1) {
+                var newKey = { frame: 0.001, value: keys[0].value };
+                keys.push(newKey);
+            }
 
             // Check limits
             if (from < keys[0].frame || from > keys[keys.length - 1].frame) {