Correctly render all four objects for every cell in a map

doc/formats/maps.md

@@ -375,7 +375,7 @@ Press "U" to get to the screen!
 
 ![Debug screen](img/cell-information-debug.png)
 
-I've added a `view-map` command to explore the data graphically. Each of the 16
+I've added a `view-minimap` command to explore the data graphically. Each of the 16
 bytes in a cell row must have a function; comparing a known map to how it looks
 in WH40K_TD.exe can help me to unravel that function.
 
@@ -431,7 +431,20 @@ maps.Cell{
 
 So `CellIdx == 9` points to the center object's Area, looked up in the set file!
 
-![Pinning down cell index 9](img/chapter01_cell_index_9.png
+![Pinning down cell index 9](img/chapter01_cell_index_9.png)
+
+It seems the area numbers are absolute indexes into the set, rather than having
+a new set of indices for each type.
+
+With this information, we can render a given Z index for a map quite easily,
+using the new `view-map` binary. It draws the four objects for every cell, and
+gives results like this:
+
+![Rendering all map objects](img/chapter01-rendering-objects.png)
+
+Some colours are off, but I've verified that I'm using the correct palette, so
+this must be due to other things. Perhaps `Data/Cycle.cyc` is the culprit, or
+maybe I need to revisit .obj file parsing a few more times!
 
 ## Trailer