Use min_height in building models for bridges and things

examples/basic-example/main.js

@@ -1,6 +1,6 @@
 var world = new VIZI.World({
-  viewport: document.querySelector("#vizicities-viewport")
-  // center: new VIZI.LatLon(40.01000594412381, -105.2727379358738) // Collada
+  viewport: document.querySelector("#vizicities-viewport"),
+  center: new VIZI.LatLon(40.742766592577496, -74.00731522962627) // Collada
 });
 
 var controls = new VIZI.ControlsMap(world.camera);
@@ -135,7 +135,8 @@ var buildingsConfig = {
         itemsProperties: "features",
         transformation: {
           outline: "geometry.coordinates",
-          height: "properties.height"
+          height: "properties.height",
+          min_height: "properties.min_height"
         }
       },
       tile: "tile"

src/Blueprint/BlueprintOutputBuildingTiles.js

@@ -353,14 +353,17 @@
       // TODO: Don't have random height logic in here
       var height = (feature.height) ? feature.height : 5 + Math.random() * 10;
 
+      var minHeight = (feature.min_height) ? feature.min_height : 0;
+
       // TODO: Add floor/level-based heights
       // << rounds the height down
       // var height = (feature.height * metersPerLevel * scalingFactor << 0);
       
       // Multiply height in meters by pixels per meter ratio at latitude
       height *= ppm.y;
+      minHeight *= ppm.y;
 
-      var extrudeSettings = { amount: height, bevelEnabled: false };
+      var extrudeSettings = { amount: height - minHeight, bevelEnabled: false };
       
       var geom = new THREE.ExtrudeGeometry( shape, extrudeSettings );
       geom.computeFaceNormals();