Made a small effect around trigger, and since I draw them as brushes, it was easy to make them prettier by rounding them a bit. I had to fix an issue with the effect's reflection in the water, fixed it by adding a blend mode that just erases the target color/alpha with the source's (I had the issue in DX, where render textures are drawn upside-down compared to OpenGL, so I add a step when I redraw it upside-down to get it right...)