I have a test project that outputs Window co-ordinates from Geometry Nodes (so a texture can be projected onto a material from a camera + alternate angle views can be rendered)
How to get the "Window Texture coordinates" in Geometry nodes?
This thread has a solution that works for Horizontal aspect ratios. When it is set vertical, the ratio correction works but the image zooms outside the bounds. Is there a method that works with horizontal and vertical aspect ratios?
Example below, the Pink box should be flush with the camera boundaries (works as intended with horizontal aspects)