Learn Chinese vs ER3D Euler Rotations in 3D

Mastery of Chinese idioms on the go! This app will help you master the most common Chinese 4-character idioms. It is designed to help both novice and advanced Chinese language students to search, browse and test their knowledge of these idioms in the most effective and fun way possible. Key features include: * 1000 commonly used idioms grouped into 20 lessons. * Superb quiz mode to help you memorize the idioms in a fun and challenging manner (NOT simple multiple choices like other trainers). * Detailed stats for quiz results down to individual word level, so you can focus on the most difficult ones for you. * Flexible search mode that searches by pinyin. * Free upgrades FOR LIFE as we add more idioms and features in the future! A couple of well timed injections of Chinese idioms in everyday conversation will easily reflect your mastery of Chinese language and form a great, lasting impression in your listeners and conversation partners.

Three-dimensional (3D) rotational kinematics are one of the most important, and yet also one of the most easily misunderstood topics of advanced mechanical engineering dynamics and trajectory simulation modeling. The ER3D mobile app aims to be a teaching aid for students and interested learners who want to understand these fundamental kinematics in an interactive and visually appealing setting, including in Augmented Reality (AR). Features of the app include: - Space Shuttle model for teaching a 3-2-1 rotation sequencee - Gyroscope model for teaching a 3-1-3 rotation sequence - Sliders to update 3-2-1 (yaw, pitch, and roll) or 3-1-3 (procession, nutation, and spin) angles - Globe Earth that may be rotated to visualize locations at different latitudes and longitudes - Context menus with text descriptions of the kinematic properties ER3D is free and open source, developed for iPhone, iPad, macOS, and VisionOS using SwiftUI and RealityKit.