Added open box background mesh
Added open box background mesh

martty/Vulkan,ming4883/Vulkan,jpbruyere/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan,ming4883/Vulkan,dreadwords/Vulkan,grim210/Vulkan,SaschaWillems/Vulkan,ming4883/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan,grim210/Vulkan,jpbruyere/Vulkan