FPS with enemies: navmesh pathfinding, and theme slots for both submitted starters

README.md

@@ -70,6 +70,34 @@ slot for all its faces, or to one slot per face. A skybox effect, referred to
 as `effect:<scene>/<layer>/<effect>`, maps to one skybox slot: the theme's
 skybox replaces its six faces.
 
+A custom object, like the 3D terrain, maps some of its properties. An image
+property maps to a texture slot, a 3D model property (like the model of
+scattered models) to a model slot, a color property to a color slot, and the
+texture of a terrain layer to a *material* slot, a texture with its normal map,
+along with the property that takes the normal map:
+
+```json
+"scene:Game Scene/Terrain": {
+  "Layer1Texture": { "slot": "terrain.ground", "normalMap": "Layer1NormalMap" },
+  "Layer2Texture": { "slot": "terrain.road", "normalMap": "Layer2NormalMap" }
+},
+"scene:Game Scene/Grass": {
+  "BaseColor": "terrain.grass.base",
+  "TipColor": "terrain.grass.tip"
+},
+"scene:Game Scene/PineForest": {
+  "Model": "nature.tree"
+}
+```
+
+A theme whose material has no normal map empties the normal map property: the
+bumps of the starter's texture would not match the theme's. A theme model keeps
+the other properties of the object, like the size of the scattered copies.
+Custom objects don't have to be mapped, except those drawing a 3D model (like
+scattered models), which are mapped or listed in `ignoredObjects` like 3D
+models. The children of a custom object that are 3D models or cubes are mapped
+too (list the placeholders of the terrain and the grass in `ignoredObjects`).
+
 **When you add a 3D starter, add its `theme-slots.json`.** The build refuses to
 publish a 3D starter without one, or one where a 3D model or cube is neither
 mapped nor listed in `ignoredObjects`, and it names the object:

examples/3d-car-coin-hunt/3d-car-coin-hunt.json

@@ -8504,11 +8504,13 @@
                 "frustumSize": 4000,
                 "intensity": 0.75,
                 "minimumShadowBias": 0,
-                "rotation": 300
+                "rotation": 300,
+                "shadowDistance": 3000
               },
               "stringParameters": {
                 "color": "255;255;255",
                 "shadowQuality": "medium",
+                "shadowRenderingMode": "fittedToCameraView",
                 "top": "Z+"
               },
               "booleanParameters": {