Special Thanks to Luoshuang (LSFW) , the creator of GPU Lightmass.

Before We Start

This is a short tutorial about how to use Geometry Shaders in UE5.

If you want to ask WHY (or you want to say GS’s performance is BAD), I think my answer is the same:

• I didn’t want to say I RECOMMEND you to use GS. I just want to share the way, in the case someone facing a situation that he or she needs to use GS.

The community also shows interests about this topic:

• https://forums.unrealengine.com/t/geometryshader-in-runtime/1925563
• https://forums.unrealengine.com/t/adding-a-geometry-shader-into-an-existing-shading-model-pipeline/143895
• https://heyyocg.link/geometry-shader-kind-houdini-sop/

Background

To avoid duplication, this tutorial is based on my previous plugin : AddMeshPassPlugin

If you have not read yet, please check this tutorial first: Add a Mesh Pass without Touching Unreal Engine Source Code

Target

Let’s say we want to create a wireframe shader

• We create edge geometries for each edge from the input triangle

To do this, we can use a geometry shader.

Create a Geometry Shader