You can replace translucency with very high roughness refraction and rely on caustics for light transport, but the roughness doesn’t go high enough and will always be light direction dependent and loose a lot of energy. The object still casts shadows, but itll make that part of your render transparent - assuming you have 'Transparent' enabled in the Film panel. ![]() Like making an object from a video cast a shadow, but block any CG objects behind it. Select the object to make transparent and go to the material configuration, if it does not have any material assigned create a new material. Since the result of SSS doesn’t light up anything, the only way to light up the backside in a scatterly fashion is using translucency. What it does: Punches a transparent hole in your render Use it for: Compositing purposes. Diffuse and translucency are both a very simplified way of describing volumetric behavior (with no volume required). If your curtain is transparent, then mix with Transparent node. They don’t have “holes”, they have matter where light bounces around inside and end up in all directions at the backside. In real life, translucent objects never pass light. Enable render view (top right of the viewport, the rightmost of the four sphere icons). In the material, lower the roughness to 0 and raise the transmission to 1. For this situations, mix the White Transparent node and set Factor value what amount you want. In real life, most of the translucent objects also show transparent characteristic. Shadow hardness based your light strength and light type, not based translucent. Yeah, I know semi-transparent paper exist, but it’s not what we normally consider paper. Go to the materials tab (in blender 2.8 this is the second icon from the bottom in the right column, a circle divided in four sections). If your curtain is transparent, then mix with Transparent node. ![]() Put a sheet of paper right in front of your eyes and try reading your screen - not happening. The light coming out on the backside is too scattered to make out anything going on behind it. I don’t see any transparency (semi transparency) going on for a sheet of regular paper - at all. A Shoji (japanese paper door/wall) will light up the room, but you can’t see through it or make out the details behind it no matter how close you go. Go to the add menu(Shift+A) in the shader editor, find shader and choose a Transparent BSDF. Given that we see shadows on the backside of fabric curtains, I’ll go with translucency and diffuse mix for the weave itself, with transparency mixed in with a thread mask. “The Translucent BSDF is used to add Lambertian diffuse transmission.”
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