Fixes animation time sampling when source data contains duplicate keyframes

jme3-plugins/src/gltf/java/com/jme3/scene/plugins/gltf/TrackData.java

@@ -36,8 +36,15 @@ public class TrackData {
             List<KeyFrame> keyFrames = new ArrayList<>();
             TimeData timeData = timeArrays.get(0);
             Type type = timeData.type;
+            float lastTime = -1f;
             for (int i = 0; i < timeData.times.length; i++) {
                 float time = timeData.times[i];
+                //avoid some double keyframes that can have bad effects on interpolation
+                if (Float.floatToIntBits(time) == Float.floatToIntBits(lastTime)) {
+                    lastTime = time;
+                    continue;
+                }
+                lastTime = time;
                 KeyFrame keyFrame = new KeyFrame();
                 keyFrame.time = time;
                 setKeyFrameTransforms(type, keyFrame, timeData.times);