Stereo Camera Rig for VR Architecture Walkthroughs

Every VR architectural walkthrough renders the same room twice — once per eye — from cameras offset by the interpupillary distance. This simulation builds that stereo rig for real inside a small furnished interior: an off-axis (asymmetric-frustum) mode that matches how real headsets render, and a toe-in mode that rotates each eye inward the way a naive implementation might. Switch between split-view and red/cyan anaglyph display, adjust IPD, convergence distance and field of view, and watch the live disparity readouts — measured by projecting a near table marker and a far wall marker through each eye's actual projection and view matrices — expose the vertical-parallax artifact that toe-in rendering introduces and off-axis projection eliminates.