![]() For the algorithm used, the principled BSDF only supports GGX and multiscatter GGX. Other than that, we can use the base color, roughness and IOR inputs just like with the glass shader. We can also change the transparency of the glass by changing the alpha value, a high alpha value will result in a very opaque material while a low alpha value will result in a very transparent material. I would also recommend setting specular to 1 though this is not required, the reason for this is that glass tends to be a very reflective material. Now, the main input we will be focusing on is transmission, as the name implies transmission is how much light is allowed to be transmitted through the surface, and consequently affected by it, it essentially lets your object act like a piece of glass, where the light can go through it and be affected like glass.įor now we will set our transmission to 1, with that you should see that our shader looks pretty close to the glass BSDF. Go ahead and connect the output socket to the surface input socket of the material output if it isn’t already. Related content: Physically based rendering and Blender materials For a more complete guide on the principled BSDF, read this article. Here we will cover the relevant inputs for glass. You can also achieve a similar effect with the Principled BSDF shader. The Normal Input allows you to change the shape of the surface that light interacts with without changing your model, this allows you to add detail to the surface without having to add an excessive amount of polygons. Add the color white and a roughness of zero and the glass will be invisible. With an IOR of 1, the glass does not bend the light. The IOR value changes the angle that the glass will bend light at, later in the article I will describe reflection and refraction in more detail with examples but to keep it brief when light refracts off of glass it gets bent by the surface of the glass, by changing the IOR you change the angle. Related content: How to bevel in Blender using the tool and modifier For interest, I also just added the monkey object inside to better show the contrast between a low and high roughness value. The cube has a solidify and bevel modifier in its stack to avoid a complete solid glass object. ![]() ![]() To demonstrate this, we can setup a node network like this using the noise texture. Roughness will change how rough the reflection of the glass is, a high roughness value will make the reflections look hazy while a low roughness value will make the reflections very clear, this can also be controlled with any kind of texture. The color will set the color of the glass, you can also control it through its input with a texture or other kinds of input. The biggest difference is that the sharp method won't take roughness into account and GGX is the only option supported when we get to Eevee. The algorithms are different scientific methods to calculate how the glass will be calculated and they give slightly different results. When we add a Glass BSDF node to the shader graph it comes with a few options: To start we will talk about the Glass BSDF Shader, this is probably the most simple and quickest way of creating a glass material. Related content: The complete beginners guide to Blender nodes, Eevee, Cycles and PBR How to create a glass shader in Cycles In the rest of this article, we will go into more detail about the method listed above and a few more methods you can use to create a glass shader. ![]() Drag from the Glass BSDF output to the Material Output Surface input.Press Shift + A then select Shader > Glass BSDF and place it.If the object has no material add one with the New Material Button.Select the object you’re applying the glass shader to.We will explore glass shaders for both Cycles and Eevee. Glass can add a lot of realism to our scenes and getting a glass shader right can be key to lighting our scenes in a convincing way. When creating art in Blender there are many cases where we may need a glass shader.
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