hello welcome to video 4. What is the material the multiply note? When I go ahead and let me pull up my example here, let me pull it up from my map and apply it. And what we're gonna see is this darker red heart inside of a darker red outlined box. And what we're doing is we're using this multiply note here and these textures to create that. So if you actually take your multiply note, which can be accessed by right-clicking and typing in multiply, it's in your math section, you're going to get this note here. Now it's going to have two inputs, both of them are constant values, and it's going to have an output of the result. These constant values can be positive or negative, they do not have to be a zero to one range, they can be greater. And this is a good way of getting a glow effect, for example, it's because when you go past a 1/4 a value and it's plugged into your missive, it ends up kind of giving a glow. Now if we

only have one input hooked up let's say this white one here. And we're multiplying by b1, we're gonna get the same result as our input. We're taking our input, multiplying it by 1, and normal math of course you're going to get the same output. If we multiply it by 0.5, for example, we're going to get 1/2, which means we're going to get a more of a gray color. So multiply is generally used if you want to brighten or darken colors and textures, and it's also a great way to kind of add textures together. So let's say we have this white box and we have this red heart, but if you notice this red heart has a red, a lighter red background. If we multiply these together, we're gonna end up getting this for the result. We're gonna get our red heart and then we're gonna get this white background applied with it as well. But where it was white in the original image, we're gonna see this more of a Pinker.

color because we have our pink or color here, and then see how we have pink on the outside. It's red because we're multiplying this pink times the gray, and we're going to end up darkening this red. So, you can think of multiply as a way to kind of combine two textures if you two together and end up getting a result. Now, the multiply doesn't have to take a texture. It can take an individual channel, or it could take individual nodes here. Like, for example, if I was to take and put this into my emissive, we're going to have a zero times a 1. And of course, it's going to give me black because zero times anything is going to give zero, and zero is black. But if we were to change this, let's say we change this to a five, we have a five times one, which is going to give us an overblown white, which is going to give us a glow effect. And keep in mind, it doesn't have to be texture, a constant. It can be a constant three, for example. So, let's say

we could take a constant three, and let's give it a blue color. Let's go ahead and multiply that blue color times five, and now we're going to get this blown-out blue glow. So, using the multiply node is a great way of getting an emissive glowing texture by just taking an input color and multiplying it by another value greater than one. You're going to go ahead and get a soft glow effect. So, that is our multiply texture, sorry, multiply note. It's pretty simple. Basically, like I said, its intention is to brighten or darken colors and textures, and it's a great way to basically combine two textures into one output texture for your material. If you have any questions or comments, please leave them below.

WTF Is? Material - Multiply in Unreal Engine 4

This channel is dedicated to exploring Unreal Engine and the Blueprint programming language that it uses. You can think of it as a companion to the API documentation as I try to cover the how and why for what things are used for when using the Blueprint system.
