Merge branch 'simulator-vision'

Author: PeterJCLaw

simulator/programming/index.md

@@ -103,6 +103,20 @@ The LEDs are attached to digital pins 3-4:
 
 Using the `digital_write` method, you can set these to True (On) or False (Off).
 
+### Vision
+
+The simulated robot has a camera which provides position and orientation
+information about other objects within the simulation. This simulates the
+system of fiducial markers which the physical robot's camera can detect.
+
+The information returned by the simulated vision API is generally in the same
+format and units as the physical robot's [vision API](/docs/programming/sr/vision/).
+
+<div class="info">
+Orientation information is returned in different formats between the simulator and the physical robot kits.
+One (possibly both) of them may change to resolve this.
+</div>
+
 ## Simulated Time
 
 In the simulated environment, time advances only at the pace that the simulator