Use getDisplayedOpacity.

spine-cocos2dx/2/src/spine/SkeletonRenderer.cpp

@@ -141,7 +141,7 @@ void SkeletonRenderer::draw () {
 	skeleton->r = nodeColor.r / (float)255;
 	skeleton->g = nodeColor.g / (float)255;
 	skeleton->b = nodeColor.b / (float)255;
-	skeleton->a = getOpacity() / (float)255;
+	skeleton->a = getDisplayedOpacity() / (float)255;
 
 	int additive = -1;
 	ccColor4B color;

spine-cocos2dx/3.0/src/spine/SkeletonRenderer.cpp

@@ -147,7 +147,7 @@ void SkeletonRenderer::drawSkeleton (const kmMat4& transform, bool transformUpda
 	skeleton->r = nodeColor.r / (float)255;
 	skeleton->g = nodeColor.g / (float)255;
 	skeleton->b = nodeColor.b / (float)255;
-	skeleton->a = getOpacity() / (float)255;
+	skeleton->a = getDisplayedOpacity() / (float)255;
 
 	int additive = -1;
 	Color4B color;

spine-cocos2dx/3.1/src/spine/SkeletonRenderer.cpp

@@ -147,7 +147,7 @@ void SkeletonRenderer::drawSkeleton (const Matrix &transform, bool transformUpda
 	skeleton->r = nodeColor.r / (float)255;
 	skeleton->g = nodeColor.g / (float)255;
 	skeleton->b = nodeColor.b / (float)255;
-	skeleton->a = getOpacity() / (float)255;
+	skeleton->a = getDisplayedOpacity() / (float)255;
 
 	int additive = -1;
 	Color4B color;