Robotics Lab — Don’t Spill The Coffee (RPY Beast)

DON’T SPILL THE COFFEE ☕

RPY Beast — Orientation Mastery for Robotics

Core Rule tattoo line

Position tells WHERE. Orientation tells HOW.

Here: the glass + water makes orientation physically obvious.

Hotkeys: 1 Roll-only • 2 +Pitch • 3 +Yaw • R Reset

Mode guided → sandbox

Guided Unlock

recommended

Mission

choose

Orientation Controls roll pitch yaw

Quaternion Rescue

avoid Euler traps

Roll (X)

-180° → +180°

Pitch (Y)

-180° → +180°

Yaw (Z)

-180° → +180°

In Guided mode: only unlocked sliders work. Use keys 1/2/3.

Position (simple) where

Tool X

-2 → +2

Tool Z

-2 → +2

Visuals clarity

Show Tool Axes

Show World Up

Show Human Arm

Enable Spill FX

Quick Tips read

Try this:

1) Press 2 then increase Pitch slowly → you’ll see spill start.

2) Pitch ≈ 90° in Euler mode → gimbal lock warning appears.

3) Toggle Quaternion Rescue → gimbal lock behavior disappears.

Mission: —

Tilt: —

State: —

Renderer failed.

Open DevTools → Console. Copy the first red error line if you want pinpoint fixes.

What’s happening here?

Robot + human both hold a glass. The water surface stays world-level (gravity). When you pitch too much → spill.

Goal: build permanent intuition of Roll / Pitch / Yaw with zero confusion.

Selected: None

Hover objects for easy explanation. Click to lock selection.

Live Math (small + useful):

—

Euler can gimbal-lock. Quaternions avoid that trap.

Meter:

Coffee mission = spill. Laser/key missions = accuracy/alignment.

—

Human arm mapping:

Shoulder = big base motion • Elbow = mid link • Wrist = your RPY
Real robots: tool orientation decides torch angle, drill direction, camera aim.

Gimbal lock warning:

In Euler mode, when |Pitch| ≈ 90°, rotation axes “collapse” (representation issue). This lab shows it.