Integrate part alpha to blend multiply mode

dist/preview release/viewer/babylon.viewer.d.ts

@@ -924,7 +924,7 @@ declare module BabylonViewer {
       * @param name the name of the custom optimizer configuration
       * @param upgrade set to true if you want to upgrade optimizer and false if you want to degrade
       */
-    export function getCustomOptimizerByName(name: string, upgrade?: boolean): typeof extendedUpgrade;
+    export function getCustomOptimizerByName(name: string, upgrade?: boolean): (sceneManager: SceneManager) => boolean;
     export function registerCustomOptimizer(name: string, optimizer: (sceneManager: SceneManager) => boolean): void;
 }
 declare module BabylonViewer {
@@ -1558,20 +1558,6 @@ declare module BabylonViewer {
     export function addLoaderPlugin(name: string, plugin: ILoaderPlugin): void;
 }
 declare module BabylonViewer {
-    /**
-        * A custom upgrade-oriented function configuration for the scene optimizer.
-        *
-        * @param viewer the viewer to optimize
-        */
-    export function extendedUpgrade(sceneManager: SceneManager): boolean;
-    /**
-        * A custom degrade-oriented function configuration for the scene optimizer.
-        *
-        * @param viewer the viewer to optimize
-        */
-    export function extendedDegrade(sceneManager: SceneManager): boolean;
-}
-declare module BabylonViewer {
 }
 declare module BabylonViewer {
     export interface IEnvironmentMapConfiguration {

dist/preview release/viewer/babylon.viewer.module.d.ts

@@ -985,14 +985,13 @@ declare module 'babylonjs-viewer/templating/viewerTemplatePlugin' {
 }
 
 declare module 'babylonjs-viewer/optimizer/custom' {
-    import { extendedUpgrade } from "babylonjs-viewer/optimizer/custom/extended";
     import { SceneManager } from "babylonjs-viewer/managers/sceneManager";
     /**
       *
       * @param name the name of the custom optimizer configuration
       * @param upgrade set to true if you want to upgrade optimizer and false if you want to degrade
       */
-    export function getCustomOptimizerByName(name: string, upgrade?: boolean): typeof extendedUpgrade;
+    export function getCustomOptimizerByName(name: string, upgrade?: boolean): (sceneManager: SceneManager) => boolean;
     export function registerCustomOptimizer(name: string, optimizer: (sceneManager: SceneManager) => boolean): void;
 }
 
@@ -1663,22 +1662,6 @@ declare module 'babylonjs-viewer/loader/plugins' {
     export function addLoaderPlugin(name: string, plugin: ILoaderPlugin): void;
 }
 
-declare module 'babylonjs-viewer/optimizer/custom/extended' {
-    import { SceneManager } from 'babylonjs-viewer/managers/sceneManager';
-    /**
-        * A custom upgrade-oriented function configuration for the scene optimizer.
-        *
-        * @param viewer the viewer to optimize
-        */
-    export function extendedUpgrade(sceneManager: SceneManager): boolean;
-    /**
-        * A custom degrade-oriented function configuration for the scene optimizer.
-        *
-        * @param viewer the viewer to optimize
-        */
-    export function extendedDegrade(sceneManager: SceneManager): boolean;
-}
-
 declare module 'babylonjs-viewer/configuration/interfaces' {
     export * from 'babylonjs-viewer/configuration/interfaces/cameraConfiguration';
     export * from 'babylonjs-viewer/configuration/interfaces/colorGradingConfiguration';

src/Shaders/gpuRenderParticles.fragment.fx

@@ -21,7 +21,8 @@ void main() {
   	outFragColor = textureColor * vColor;
 
 	#ifdef BLENDMULTIPLYMODE
-	outFragColor.rgb += vec3(1.0 - textureColor.a);
+	float alpha = vColor.a * textureColor.a;
+	outFragColor.rgb = outFragColor.rgb * alpha + vec3(1.0) * (1.0 - alpha);	
 	#endif	  
 
 // Apply image processing if relevant. As this applies in linear space, 

src/Shaders/particles.fragment.fx

@@ -15,12 +15,12 @@ uniform sampler2D diffuseSampler;
 void main(void) {
 	#include<clipPlaneFragment>
 
-	vec4 baseColor = texture2D(diffuseSampler, vUV);
-	float alpha = baseColor.a;
-	baseColor = (baseColor * textureMask + (vec4(1., 1., 1., 1.) - textureMask)) * vColor;
+	vec4 textureColor = texture2D(diffuseSampler, vUV);
+	vec4 baseColor = (textureColor * textureMask + (vec4(1., 1., 1., 1.) - textureMask)) * vColor;
 
 	#ifdef BLENDMULTIPLYMODE
-	baseColor.rgb += vec3(1.0 - alpha);
+	float alpha = vColor.a * textureColor.a;
+	baseColor.rgb = baseColor.rgb * alpha + vec3(1.0) * (1.0 - alpha);
 	#endif
 
 // Apply image processing if relevant. As this applies in linear space,