adjusted the size of the box obstacle

Author: Antonio-Griego

simulation/models/box/model.sdf

@@ -1,7 +1,7 @@
 <?xml version='1.0'?>
 <sdf version='1.4'>
   <model name="box">
-    <pose>0.0 0.0 1.0 0.0 0.0 0.0</pose>
+    <pose>0.0 0.0 0.25 0.0 0.0 0.0</pose>
     <static>true</static>
     <link name='link'>
       <inertial>
@@ -18,7 +18,7 @@
       <visual name='visual'>
         <geometry>
           <box>
-            <size>2.0 2.0 2.0</size>
+            <size>0.5 0.5 0.5</size>
           </box>
         </geometry>
         <material>
@@ -32,7 +32,7 @@
       <collision name ='collision'>
         <geometry>
           <box>
-            <size>2.0 2.0 2.0</size>
+            <size>0.5 0.5 0.5</size>
           </box>
         </geometry>
         <surface>