fix gpu particle for particle helper

dist/preview release/what's new.md

@@ -9,16 +9,16 @@
 - New GUI control: the [Grid](http://doc.babylonjs.com/how_to/gui#grid) ([Deltakosh](https://github.com/deltakosh))
 - Gizmo and GizmoManager classes used to manipulate meshes in a scene. Gizmo types include: position, rotation, scale and bounding box ([TrevorDev](https://github.com/TrevorDev))
 - Particle system improvements ([Deltakosh](https://github.com/deltakosh))
-  - Added a ParticleHelper class to create some pre-configured particle systems in a one-liner method style ([DevChris](https://github.com/yovanoc))
+  - Added a ParticleHelper class to create some pre-configured particle systems in a one-liner method style. [Doc](https://doc.babylonjs.com/How_To/ParticleHelper) ([Deltakosh](https://github.com/deltakosh)) / ([DevChris](https://github.com/yovanoc))
   - Improved CPU particles rendering performance (up to x2 on low end devices)
   - Added support for `isBillboardBased`. [Doc](http://doc.babylonjs.com/babylon101/particles#alignment)
-  - Added support for `minScaleX`, `minScaleY`, `maxScaleX`, `maxScaleY`. [Doc](http://doc.babylonjs.com/babylon101/particles#size)
-  - Added support for `radiusRange` for sphere emitter. [Doc](http://doc.babylonjs.com/babylon101/particles#sphere-emitter)
-  - Added support for `ParticleSystem.BLENDMODE_ADD` alpha mode. [Doc](http://doc.babylonjs.com/babylon101/particles#particle-blending)
-  - Added support for color gradients. [Doc](http://doc.babylonjs.com/babylon101/particles#particle-colors)
-  - Added support for pre-warming. [Doc](http://doc.babylonjs.com/babylon101/particles#pre-warming)
-  - Added support for `minInitialRotation` and `maxInitialRotation`. [Doc](http://doc.babylonjs.com/babylon101/particles#rotation)
-  - Added support for size gradients. [Doc](http://doc.babylonjs.com/babylon101/particles#size)
+  - Added support for `minScaleX`, `minScaleY`, `maxScaleX`, `maxScaleY`. [Doc](https://doc.babylonjs.com/babylon101/particles#size)
+  - Added support for `radiusRange` for sphere emitter. [Doc](https://doc.babylonjs.com/babylon101/particles#sphere-emitter)
+  - Added support for `ParticleSystem.BLENDMODE_ADD` alpha mode. [Doc](https://doc.babylonjs.com/babylon101/particles#particle-blending)
+  - Added support for color gradients. [Doc](https://doc.babylonjs.com/babylon101/particles#particle-colors)
+  - Added support for pre-warming. [Doc](https://doc.babylonjs.com/babylon101/particles#pre-warming)
+  - Added support for `minInitialRotation` and `maxInitialRotation`. [Doc](https://doc.babylonjs.com/babylon101/particles#rotation)
+  - Added support for size gradients. [Doc](https://doc.babylonjs.com/babylon101/particles#size)
 
 ## Updates
 

src/Particles/babylon.gpuParticleSystem.ts

@@ -550,6 +550,10 @@
             this._scene = scene || Engine.LastCreatedScene;
             this._engine = this._scene.getEngine();
 
+            if (!options.randomTextureSize) {
+                delete options.randomTextureSize;
+            }
+
             let fullOptions = {
                 capacity: 50000,
                 randomTextureSize: this._engine.getCaps().maxTextureSize,
@@ -1179,6 +1183,7 @@
             var serializationObject: any = {};
 
             ParticleSystem._Serialize(serializationObject, this);
+            serializationObject.activeParticleCount = this.activeParticleCount;
 
             return serializationObject;            
         }
@@ -1194,7 +1199,9 @@
             var name = parsedParticleSystem.name;
             var particleSystem = new GPUParticleSystem(name, {capacity: parsedParticleSystem.capacity, randomTextureSize: parsedParticleSystem.randomTextureSize}, scene);
 
-            particleSystem.activeParticleCount = parsedParticleSystem.activeParticleCount;
+            if (parsedParticleSystem.activeParticleCount) {
+                particleSystem.activeParticleCount = parsedParticleSystem.activeParticleCount;
+            }
             ParticleSystem._Parse(parsedParticleSystem, particleSystem, scene, rootUrl);
 
             return particleSystem;