Visual fixes to lights and robot

src/ign_world/world/world.sdf

@@ -9,18 +9,28 @@
         <plugin name='ignition::gazebo::systems::SceneBroadcaster' filename='ignition-gazebo-scene-broadcaster-system'/>
         <plugin name='ignition::gazebo::systems::Contact' filename='ignition-gazebo-contact-system'/>
     
-          <light type="directional" name="sun">
+        <light type="point" name="point_light_1">
             <cast_shadows>true</cast_shadows>
-            <pose>0 0 10 0 0 0</pose>
-            <diffuse>0.8 0.8 0.8 1</diffuse>
-            <specular>0.2 0.2 0.2 1</specular>
-            <attenuation>
-                <range>1000</range>
-                <constant>0.9</constant>
-                <linear>0.01</linear>
-                <quadratic>0.001</quadratic>
-            </attenuation>
-            <direction>-0.1 0.1 -0.9  </direction>
+            <pose>1 1 2.5 0 0 0</pose>
+            <visualize>false</visualize>
+        </light>
+        
+        <light type="point" name="point_light_2">
+            <cast_shadows>true</cast_shadows>
+            <pose>5 1 2.5 0 0 0</pose>
+            <visualize>false</visualize>
+        </light>
+        
+        <light type="point" name="point_light_3">
+            <cast_shadows>true</cast_shadows>
+            <pose>1 5 2.5 0 0 0</pose>
+            <visualize>false</visualize>
+        </light>
+        
+        <light type="point" name="point_light_4">
+            <cast_shadows>true</cast_shadows>
+            <pose>5 5 2.5 0 0 0</pose>
+            <visualize>false</visualize>
         </light>
         
         <actor name="actor_walking">