Orthographic projection in 3D and Columbus view

Apps/Sandcastle/gallery/development/Shadows.html

@@ -525,7 +525,7 @@
     var frustumSize = 55.0;
     var frustumNear = 1.0;
     var frustumFar = 400.0;
-    var frustum = new Cesium.OrthographicFrustum();
+    var frustum = new Cesium.OrthographicOffCenterFrustum();
     frustum.left = -frustumSize;
     frustum.right = frustumSize;
     frustum.bottom = -frustumSize;

CHANGES.md

@@ -3,6 +3,8 @@ Change Log
 
 ### 1.32 - 2017-04-03
 
+* Deprecated
+    * The `left`, `right`, `bottom`, and `top` properties of `OrthographicFrustum` are deprecated and will be removed in 1.33. Use `OrthographicOffCenterFrustum` instead.
 * Added `Camera.flyTo` and `Camera.flyToBoundingSphere` options [#5070](https://github.com/AnalyticalGraphicsInc/cesium/pull/5070)
     * `flyOverLongitude` to select one of two possible on Globe paths which camera should fly.
     * `flyOverLongitudeWeight` to set a threshold: how many times the `flyOverLongitude` way can be than shortest path.
@@ -15,6 +17,7 @@ Change Log
 * Fixed an issue with `PinBuilder` where inset images could have low-alpha fringes against an opaque background.  [#5099](https://github.com/AnalyticalGraphicsInc/cesium/pull/5099)
 * Fixed a bug in `ModelAnimationCache` causing different animations to reference the same animation. [#5064](https://github.com/AnalyticalGraphicsInc/cesium/pull/5064)
 * Fixed a bug that caused an exception in `CesiumInspectorViewModel` when using the NW / NE / SW / SE / Parent buttons to navigate to a terrain tile that is not yet loaded.
+* Added support for an orthographic projection in 3D and Columbus view. Set `projectionPicker` to `true` in the options when creating a `Viewer` to add a widget that will switch projections. [#5021](https://github.com/AnalyticalGraphicsInc/cesium/pull/5021)
 
 ### 1.31 - 2017-03-01
 

Source/Core/HeightmapTessellator.js

@@ -214,8 +214,11 @@ define([
         var elementMultiplier = defaultValue(structure.elementMultiplier, HeightmapTessellator.DEFAULT_STRUCTURE.elementMultiplier);
         var isBigEndian = defaultValue(structure.isBigEndian, HeightmapTessellator.DEFAULT_STRUCTURE.isBigEndian);
 
-        var granularityX = Rectangle.computeWidth(nativeRectangle) / (width - 1);
-        var granularityY = Rectangle.computeHeight(nativeRectangle) / (height - 1);
+        var rectangleWidth = Rectangle.computeWidth(nativeRectangle);
+        var rectangleHeight = Rectangle.computeHeight(nativeRectangle);
+
+        var granularityX = rectangleWidth / (width - 1);
+        var granularityY = rectangleHeight / (height - 1);
 
         var radiiSquared = ellipsoid.radiiSquared;
         var radiiSquaredX = radiiSquared.x;
@@ -337,10 +340,29 @@ define([
 
                 heightSample = (heightSample * heightScale + heightOffset) * exaggeration;
 
+                var u = (longitude - geographicWest) / (geographicEast - geographicWest);
+                u = CesiumMath.clamp(u, 0.0, 1.0);
+                uvs[index] = new Cartesian2(u, v);
+
                 maximumHeight = Math.max(maximumHeight, heightSample);
                 minimumHeight = Math.min(minimumHeight, heightSample);
 
                 if (colIndex !== col || rowIndex !== row) {
+                    var percentage = 0.00001;
+                    if (colIndex < 0) {
+                        longitude -= percentage * rectangleWidth;
+                    } else {
+                        longitude += percentage * rectangleWidth;
+                    }
+                    if (rowIndex < 0) {
+                        latitude += percentage * rectangleHeight;
+                    } else {
+                        latitude -= percentage * rectangleHeight;
+                    }
+
+                    cosLatitude = cos(latitude);
+                    nZ = sin(latitude);
+                    kZ = radiiSquaredZ * nZ;
                     heightSample -= skirtHeight;
                 }
 
@@ -365,10 +387,6 @@ define([
                 positions[index] = position;
                 heights[index] = heightSample;
 
-                var u = (longitude - geographicWest) / (geographicEast - geographicWest);
-                u = CesiumMath.clamp(u, 0.0, 1.0);
-                uvs[index] = new Cartesian2(u, v);
-
                 if (includeWebMercatorT) {
                     webMercatorTs[index] = webMercatorT;
                 }

Source/Renderer/AutomaticUniforms.js

@@ -530,17 +530,6 @@ define([
             }
         }),
 
-        /**
-         * @private
-         */
-        czm_inverseProjectionOIT : new AutomaticUniform({
-            size : 1,
-            datatype : WebGLConstants.FLOAT_MAT4,
-            getValue : function(uniformState) {
-                return uniformState.inverseProjectionOIT;
-            }
-        }),
-
         /**
          * An automatic GLSL uniform representing a 4x4 projection transformation matrix with the far plane at infinity,
          * that transforms eye coordinates to clip coordinates.  Clip coordinates is the

Source/Renderer/UniformState.js

@@ -13,6 +13,7 @@ define([
         '../Core/Matrix4',
         '../Core/Simon1994PlanetaryPositions',
         '../Core/Transforms',
+        '../Scene/OrthographicFrustum',
         '../Scene/SceneMode'
     ], function(
         BoundingRectangle,
@@ -28,6 +29,7 @@ define([
         Matrix4,
         Simon1994PlanetaryPositions,
         Transforms,
+        OrthographicFrustum,
         SceneMode) {
     'use strict';
 
@@ -80,9 +82,6 @@ define([
         this._inverseProjectionDirty = true;
         this._inverseProjection = new Matrix4();
 
-        this._inverseProjectionOITDirty = true;
-        this._inverseProjectionOIT = new Matrix4();
-
         this._modelViewDirty = true;
         this._modelView = new Matrix4();
 
@@ -147,6 +146,7 @@ define([
         this._frustum2DWidth = 0.0;
         this._eyeHeight2D = new Cartesian2();
         this._resolutionScale = 1.0;
+        this._orthographicIn3D = false;
 
         this._fogDensity = undefined;
 
@@ -393,17 +393,6 @@ define([
             }
         },
 
-        /**
-         * @memberof UniformState.prototype
-         * @private
-         */
-        inverseProjectionOIT : {
-            get : function() {
-                cleanInverseProjectionOIT(this);
-                return this._inverseProjectionOIT;
-            }
-        },
-
         /**
          * @memberof UniformState.prototype
          * @type {Matrix4}
@@ -834,7 +823,6 @@ define([
         Matrix4.clone(matrix, uniformState._projection);
 
         uniformState._inverseProjectionDirty = true;
-        uniformState._inverseProjectionOITDirty = true;
         uniformState._viewProjectionDirty = true;
         uniformState._inverseViewProjectionDirty = true;
         uniformState._modelViewProjectionDirty = true;
@@ -896,6 +884,8 @@ define([
         this._entireFrustum.x = camera.frustum.near;
         this._entireFrustum.y = camera.frustum.far;
         this.updateFrustum(camera.frustum);
+
+        this._orthographicIn3D = this._mode !== SceneMode.SCENE2D && camera.frustum instanceof OrthographicFrustum;
     };
 
     /**
@@ -913,7 +903,7 @@ define([
         this._currentFrustum.x = frustum.near;
         this._currentFrustum.y = frustum.far;
 
-        if (!defined(frustum.top)) {
+        if (defined(frustum._offCenterFrustum)) {
             frustum = frustum._offCenterFrustum;
         }
 
@@ -987,18 +977,10 @@ define([
         if (uniformState._inverseProjectionDirty) {
             uniformState._inverseProjectionDirty = false;
 
-            Matrix4.inverse(uniformState._projection, uniformState._inverseProjection);
-        }
-    }
-
-    function cleanInverseProjectionOIT(uniformState) {
-        if (uniformState._inverseProjectionOITDirty) {
-            uniformState._inverseProjectionOITDirty = false;
-
-            if (uniformState._mode !== SceneMode.SCENE2D && uniformState._mode !== SceneMode.MORPHING) {
-                Matrix4.inverse(uniformState._projection, uniformState._inverseProjectionOIT);
+            if (uniformState._mode !== SceneMode.SCENE2D && uniformState._mode !== SceneMode.MORPHING && !uniformState._orthographicIn3D) {
+                Matrix4.inverse(uniformState._projection, uniformState._inverseProjection);
             } else {
-                Matrix4.clone(Matrix4.IDENTITY, uniformState._inverseProjectionOIT);
+                Matrix4.clone(Matrix4.ZERO, uniformState._inverseProjection);
             }
         }
     }