Revert 1fda8c0

CHANGES.md

@@ -8,6 +8,7 @@ Change Log
 
 #### Fixes :wrench:
 * Fixed bug causing billboards and labels to appear the wrong size when switching scene modes [#6745](https://github.com/AnalyticalGraphicsInc/cesium/issues/6745)
+* Fixed a bug that was preventing 3D Tilesets on the opposite side of the globe from being occluded [#6714](https://github.com/AnalyticalGraphicsInc/cesium/issues/6714)
 
 ### 1.47 - 2018-07-02
 

CONTRIBUTORS.md

@@ -184,3 +184,4 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 * [Jonathan Puckey](https://github.com/puckey)
 * [Mark Erikson](https://github.com/markerikson)
 * [Hannah Bollar](https://github.com/hanbollar)
+* [Brandon Barker](https://github.com/ProjectBarks)

Source/Scene/DepthPlane.js

@@ -51,15 +51,23 @@ 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 = ellipsoid.radii;
+        var radii = Cartesian3.clone(ellipsoid.radii, scratchRadii);
         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

@@ -2314,6 +2314,9 @@ define([
 
             if (clearGlobeDepth) {
                 clearDepth.execute(context, passState);
+                if (useDepthPlane) {
+                    depthPlane.execute(context, passState);
+                }
             }
 
             if (!environmentState.useInvertClassification || picking) {
@@ -2431,10 +2434,6 @@ define([
                 scene._stencilClearCommand.execute(context, passState);
             }
 
-            if (clearGlobeDepth && useDepthPlane) {
-                depthPlane.execute(context, passState);
-            }
-
             us.updatePass(Pass.OPAQUE);
             commands = frustumCommands.commands[Pass.OPAQUE];
             length = frustumCommands.indices[Pass.OPAQUE];