SubViewportDecal is a Decal-class node that captures a SubViewport's rendered output and projects its contents onto 3D surfaces as a Texture. A few good use-case examples for this are:

• Real-time 3D model Drop-Shadows
• 2D nodes projected onto 3D geometry/World-space UI
• AND live 3D projections (similar to how The Riddler is projected onto walls and banners in the Arkham series)

You can increase the "Frame Break" variable in the inspector to lower the capture framerate (maximum framerate is 60 FPS). Allows in-editor updating!*

*Real-time updating of the Decal's recieved SubViewport textures won't be shown without toggling "Update In Editor", to reduce resource usage. SubViewport sizes larger than 512x512 may cause performance drops on weaker hardware