Update when depth plane is rendered.

Author: bagnell

Source/Scene/DepthPlane.js

@@ -50,23 +50,15 @@ define([
     }
 
     var depthQuadScratch = FeatureDetection.supportsTypedArrays() ? new Float32Array(12) : [];
-    var scratchRadii = new Cartesian3();
     var scratchCartesian1 = new Cartesian3();
     var scratchCartesian2 = new Cartesian3();
     var scratchCartesian3 = new Cartesian3();
     var scratchCartesian4 = new Cartesian3();
 
     function computeDepthQuad(ellipsoid, frameState) {
-        var radii = Cartesian3.clone(ellipsoid.radii, scratchRadii);
+        var radii = ellipsoid.radii;
         var p = frameState.camera.positionWC;
 
-        // Where did this magical number come from? It's how far a GroundPrimitive will be extruded below the surface
-        // of the Earth. This effectively pushes the depth plane farther from the camera so that classifications on
-        // 3D Tiles do not intersect the depth plane. This can be removed when depth testing is enabled by default.
-        radii.x -= 11000.0;
-        radii.y -= 11000.0;
-        radii.z -= 11000.0;
-
         // Find the corresponding position in the scaled space of the ellipsoid.
         var q = Cartesian3.multiplyComponents(ellipsoid.oneOverRadii, p, scratchCartesian1);
 

Source/Scene/Scene.js

@@ -1945,9 +1945,6 @@ define([
 
             if (clearGlobeDepth) {
                 clearDepth.execute(context, passState);
-                if (useDepthPlane) {
-                    depthPlane.execute(context, passState);
-                }
             }
 
             us.updatePass(Pass.CESIUM_3D_TILE);
@@ -1968,6 +1965,10 @@ define([
                 executeCommand(commands[j], scene, context, passState);
             }
 
+            if (clearGlobeDepth && useDepthPlane) {
+                depthPlane.execute(context, passState);
+            }
+
             // Execute commands in order by pass up to the translucent pass.
             // Translucent geometry needs special handling (sorting/OIT).
             var startPass = Pass.CESIUM_3D_TILE_CLASSIFICATION + 1;