HOW Do I Create A See-through Curtain material In v-ray?
See-through materials can be really hard to get right and yet they are so prevalent in our world that we have to learn to accurately represent them.
The first step is to be sure what properties your chosen material exhibits. You need to know how translucent it is along with how the light responds to it. Can you see more of the back side than the front side? Notice also how the translucency is not likely to be uniform, but instead becomes less translucent when viewed at an angle.
With that in mind, here’s how I would set up a see-through curtain material like the one in the image. Firstly you need to create a V-ray Two-sided Material. This material is brilliant because it lets you plug in a V-ray Material to both the front and back slots and then adjust the translucency based on a colour or a bitmap. (For the purposes of answering this question we’ll use the same material for the front and back.) Create a V-ray Material and connect it to the front slot. Make the diffuse colour of this close to white and set the reflection colour to a mid grey. The closer it is to white the more reflective it’ll be. We also want to spread these reflections out so that they are not too defined. Do that by adjusting the Highlight Glossiness and Reflection Glossiness to around 0.75. You can go higher if you want it more noticeably reflective or lower if you want the reflections to get lost over the surface.
As this curtain material is less translucent when viewed at an angle, I to need to put a Falloff map inside of the Refract map. In its parameters set the first colour to be a 190 grey and the second to be a 110 grey. Set both these to 50 per cent.
This will give you a good grounding for this type of material. You can then adjust how reflective and refractive it is as well as inserting a pattern to the diffuse slot to make it more interesting.