In 3D modeling, a "3D coordinate system" is a spatial framework that uses three mutually perpendicular axes (X, Y, Z) to define the position, orientation, and size of 3D models, serving as a critical reference for precise spatial location.
Key details include: - **Axis composition**: Typically consists of X (left-right), Y (up-down), and Z (front-back/depth) axes intersecting at an origin point (0,0,0), the starting reference for all coordinates. - **Core function**: Enables accurate placement of model components, ensuring alignment and proportionality—essential for tasks like animation, 3D printing, or scene assembly.
Mastering this system is foundational for effectively manipulating and structuring 3D models.