I believe the standard way is to downgrade the sampling density outside the area you're looking, see https://docs.vulkan.org/samples/latest/samples/extensions/fr... . Optimally you could attach multiple buffers with different resolutions covering different parts of clipspace, saving vram bandwidth. Sadly this is not supported currently to my knowledge, so you have to write to a single giant buffer with lower sample resolution outside the detail area, and then just downsample it for the coarse layer.