UEC++ From Basics to Advanced | M21-006: Write Viewport Pixel Data Interface

This video shows how to capture viewport pixel data from the Unreal Engine renderer and prepare it for WebP encoding. The viewport capture interface reads the current frame buffer, extracts RGBA pixel data, and packages it into the format expected by the libwebp encoder. We use FViewport::ReadPixels() to read render target data, convert between color formats as needed, handle resolution and aspect ratio considerations, and implement efficient memory transfer from GPU to CPU memory. The interface supports configurable capture regions and supersampling options for higher quality output. By the end of this lesson, you will have a robust viewport capture system that feeds real-time pixel data directly into the WebP encoding pipeline, enabling screenshot, recording, and streaming applications within Unreal Engine.