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Xb Depth

google/xb-depth

>- Add WebXR depth sensing to an XR Blocks app — a live depth map and depth mesh of the room — so virtual content is occluded by real-world geometry and (optionally) generates physics colliders that match the environment. Use for realistic occlusion (a person walks in front of a virtual object), depth-aware reticles, or depth-mesh collision for physics. Covers `enableDepth()`, the `DepthOptions` presets (`xrDepthMeshOptions`, `xrDepthMeshPhysicsOptions`), `colliderUpdateFps`, and `showReticleOnDepthMesh`. Pair with xb-physics for geometry-aware collisions.

606 tokens
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the whole folder, loaded on every use
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instructions only
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455
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on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/google/xrblocks --skill xb-depth

The instruction itself

5 sections, as written by the author

xb-depth: depth sensing & occlusion

Depth gives virtual objects awareness of real-world geometry: occlusion, depth-aware

reticles, and an optional depth-mesh collider for physics. See samples/depthmap,

samples/depthmesh, and demos/occlusion.

Enable depth (with occlusion)

const options = new xb.Options();
options.enableDepth(); // depth sensing + depth mesh
xb.init(options);

enableDepth() applies the xrDepthMeshOptions preset. For finer control, build

DepthOptions yourself:

options.depth = new xb.DepthOptions(xb.xrDepthMeshOptions);
options.depth.matchDepthView = false;

Depth-mesh colliders for physics

To make real geometry collidable (e.g. balls bounce off the floor/furniture), use the

physics preset and set a collider refresh rate, then enable physics (see

xb-physics):

import RAPIER from '@dimforge/rapier3d-simd-compat';
options.depth = new xb.DepthOptions(xb.xrDepthMeshPhysicsOptions);
options.depth.depthMesh.colliderUpdateFps = 5; // rebuild colliders 5×/sec
options.physics.RAPIER = RAPIER;

(Alternatively, scene-mesh detection: options.world.enableMeshDetection() — see

xb-world.)

Useful APIs

  • xb.showReticleOnDepthMesh(true) — let the reticle target the depth mesh.
  • xb.core.depth.depthMesh — the depth mesh object (e.g. ignoreReticleRaycast).
  • Occlusion is handled by the depth subsystem (src/depth/occlusion/);

demos/occlusion shows real-people-in-front-of-virtual-objects.

Notes

  • Depth sensing requires a device/runtime that supports the WebXR Depth Sensing API; the

simulator provides a simulated depth source for desktop testing.

  • Depth + physics is the recipe behind demos/ballpit and demos/splash.

How to use it

Copy the folder

Take google/xb-depth from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.