Drone position control fix

CustomRobots/drone_assets/models/dirt_path/model.config

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<model>
+  <name>dirt_path</name>
+  <version>1.0</version>
+  <sdf version="1.6">model.sdf</sdf>
+  <author>
+    <name>RoboticsAcademy</name>
+    <email></email>
+  </author>
+  <description>
+    Procedurally generated tileable-ish dirt texture (materials/textures/dirt.png),
+    used as the albedo map for the trail segments in position_control.world.
+    This model.sdf is a trivial 1x1 static tile so the folder is a valid
+    model package; the actual trail is built from inline boxes in the
+    world file that reference this same texture directly.
+  </description>
+</model>

CustomRobots/drone_assets/models/dirt_path/model.sdf

@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<sdf version="1.6">
+    <model name="dirt_path">
+        <static>true</static>
+        <link name="link">
+            <visual name="visual">
+                <cast_shadows>false</cast_shadows>
+                <geometry>
+                    <box>
+                        <size>1 1 0.01</size>
+                    </box>
+                </geometry>
+                <material>
+                    <ambient>1.0 1.0 1.0 1.0</ambient>
+                    <diffuse>1.0 1.0 1.0 1.0</diffuse>
+                    <pbr>
+                        <metal>
+                            <albedo_map>model://dirt_path/materials/textures/dirt.png</albedo_map>
+                        </metal>
+                    </pbr>
+                </material>
+            </visual>
+        </link>
+    </model>
+</sdf>

CustomRobots/drone_assets/models/falling_rock/materials/scripts/model.material

@@ -0,0 +1,13 @@
+material FallingRocks/FallingRocks_Diffuse
+{
+  technique
+  {
+    pass
+    {
+      texture_unit
+      {
+        texture FallingRocks_Albedo.jpg
+      }
+    }
+  }
+}