Merge pull request #7412 from AnalyticalGraphicsInc/particle-size

Fix particle image size

Author: mramato

CHANGES.md

@@ -9,6 +9,9 @@ Change Log
 ##### Additions :tada:
 * Added the ability to specify the width of the intersection volume for `Scene.sampleHeight`, `Scene.clampToHeight`, `Scene.sampleHeightMostDetailed`, and `Scene.clampToHeightMostDetailed`. [#7287](https://github.com/AnalyticalGraphicsInc/cesium/pull/7287)
 
+##### Fixes :wrench:
+* Fixed image size issue when using multiple particle systems [#7412](https://github.com/AnalyticalGraphicsInc/cesium/pull/7412)
+
 ### 1.53 - 2019-01-02
 
 ##### Additions :tada:

Source/Scene/ParticleSystem.js

@@ -134,8 +134,8 @@ define([
         this._minimumMass = defaultValue(options.mass, defaultValue(options.minimumMass, 1.0));
         this._maximumMass = defaultValue(options.mass, defaultValue(options.maximumMass, 1.0));
 
-        this._minimumImageSize = defaultValue(options.imageSize, defaultValue(options.minimumImageSize, defaultImageSize));
-        this._maximumImageSize = defaultValue(options.imageSize, defaultValue(options.maximumImageSize, defaultImageSize));
+        this._minimumImageSize = Cartesian2.clone(defaultValue(options.imageSize, defaultValue(options.minimumImageSize, defaultImageSize)));
+        this._maximumImageSize = Cartesian2.clone(defaultValue(options.imageSize, defaultValue(options.maximumImageSize, defaultImageSize)));
 
         this._lifetime = defaultValue(options.lifetime, Number.MAX_VALUE);
 

Specs/Scene/ParticleSystemSpec.js

@@ -323,6 +323,11 @@ defineSuite([
         }).toThrowDeveloperError();
     });
 
+    it('clones default image size', function() {
+        var p = new ParticleSystem();
+        expect(p.maximumImageSize).not.toBe(p.minimumImageSize);
+    });
+
     it('renders', function() {
         scene.primitives.add(new ParticleSystem({
             image : greenImage,