enhance target painting

target.fs

@@ -4,5 +4,8 @@ varying vec2 vTexCoord;
 varying vec3 color;                                                            
 void main()                                                                
 {                                               
-   gl_FragColor = vec4(color.x,color.y,color.z,texture2D(texture, vTexCoord).w);
+   if(texture2D(texture, vTexCoord).w == 0)
+      discard;
+                               
+   gl_FragColor = vec4(color.x,color.y,color.z,1);
 }