how to raycast against global mesh with MR Utility Kit

I've been trying to raycast against the Quest 3 room global mesh with MRUK and my solutions keep getting more and more convoluted, can't be right.. Dug around the samples a bit and couldn't find anything, and the anchor raycast looks like it only does plane/volume and not the global mesh. Can someone point me in the right direction? an example would be fantastic..