Material Functions: Material Functions are more dynamic because you can create Material Functions to perform any type of calculations you want. The only way you could change this was to make changes to the source code. For example, a Multiply node can only Multiply, it will never be able to add two numbers together. Material Expressions: Material Expressions are static pieces of code that can only do what they are programmed to do. The main difference between Material Functions and Material Expressions is that Material Functions are made inside of the Material Function Editor and saved assets in the Content Browser. While Material Expressions and Material Functions are the building blocks used to create Materials, there are some differences between the nodes and how they work. This node contains specific HLSL code that tells the Material to move the UV coordinates of the Texture that it is applied to in a specific direction, making it look like it is moving.Īs you will soon see, Material Expression nodes are key to building and interacting with the Materials you create. Materials are built using combinations of Material Expression nodes that are combined together to do certain tasks.įor example, if you want a Texture to move inside of a Material, you can use the Panner Material Expression node. Material Expression nodes contain tiny snippets of HLSL code that perform very specific tasks inside of a Material. In this How-to guide, we will be learning the various ways that we can place Material Expressions and Material Functions inside of the Material Graph. Material Expressions and Material Functions are the building blocks used to create fully functional Materials inside Unreal Engine 4.Įach expression or function is a self-contained black box that can run little snippets of code on their inputs and output the results. Difference Between Material Expressions and Material Functions
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