I'm using the simpleRefraction shader applied to a particle system for the rain on a windshield. https://drive.google.com/uc?id=0B53omuMBfAaNQW92YU53clc0Vnc I'm not so expert so my question is: why the distortion take into consideration also the object outside the windshield? Take a look neat the central rear mirror. You can see the black of the mirror border and the light grey of the mirror. Do you have any tips to avoid this? Thanks in advance.