Merge pull request #8202 from AnalyticalGraphicsInc/fix-blending-state

Merged fix blending state branch

Author: IanLilleyT

CHANGES.md

@@ -27,6 +27,7 @@ Change Log
 * Fixed a crash for 3D Tiles that have zero volume. [#7945](https://github.com/AnalyticalGraphicsInc/cesium/pull/7945)
 * Fixed a bug where dynamic polylines did not use the given arcType. [#8191](https://github.com/AnalyticalGraphicsInc/cesium/issues/8191)
 * Fixed a bug where GlobeSurfaceTile would not render the tile until all layers completed loading causing globe to appear to hang. [#7974](https://github.com/AnalyticalGraphicsInc/cesium/issues/7974)
+* Fixed alpha equation for `BlendingState.ALPHA_BLEND` and `BlendingState.ADDITIVE_BLEND`. [#8202](https://github.com/AnalyticalGraphicsInc/cesium/pull/8202)
 
 ### 1.61 - 2019-09-03
 

Source/Scene/BlendingState.js

@@ -40,7 +40,7 @@ define([
             equationRgb : BlendEquation.ADD,
             equationAlpha : BlendEquation.ADD,
             functionSourceRgb : BlendFunction.SOURCE_ALPHA,
-            functionSourceAlpha : BlendFunction.SOURCE_ALPHA,
+            functionSourceAlpha : BlendFunction.ONE,
             functionDestinationRgb : BlendFunction.ONE_MINUS_SOURCE_ALPHA,
             functionDestinationAlpha : BlendFunction.ONE_MINUS_SOURCE_ALPHA
         }),
@@ -72,7 +72,7 @@ define([
             equationRgb : BlendEquation.ADD,
             equationAlpha : BlendEquation.ADD,
             functionSourceRgb : BlendFunction.SOURCE_ALPHA,
-            functionSourceAlpha : BlendFunction.SOURCE_ALPHA,
+            functionSourceAlpha : BlendFunction.ONE,
             functionDestinationRgb : BlendFunction.ONE,
             functionDestinationAlpha : BlendFunction.ONE
         })