3D Scene Coordinate System

Version

Application Scenario

3D applications may involve the mapping relationship between 3D virtual scenes and real-world coordinates. For example, an Automatic Guided Vehicle (AGV) travels 1 m in reality = n unit lengths in the 3D scene. The coordinate mapping relationship affects 3D scene modeling, real-time model movement, and real-time position generation. The 3D scene coordinate system can solve this problem.

Note:

The 3D scene coordinate system applies only to 3D custom scene components.

Note:

 The 3D scene in FVS uniformly uses a left-handed coordinate system.

Unified Scale Unit for 3D Scenes

The mapping relationship between unit lengths in the 3D scene and real-world units is: 1 unit length in the 3D scene = 1 m in the real world. During modeling, it is necessary to establish a proper scale mapping between the real world and the 3D scene to ensure that the virtual scene restores the real scene in equal proportion. Method to change length units in Blender:

Latitude and Longitude Coordinate System for 3D Scenes

After the 3D scene is created, each model will have a coordinate (x, y, z) relative to the scene's origin. To achieve latitude and longitude coordinate mapping for the 3D scene, you need to select the origin in the 3D scene to set the latitude and longitude coordinates. Use the East-North-Up (ENU) coordinate system to build a local coordinate system, where the selected origin is the origin, the x-axis points due east, the z-axis points due north, and the y-axis points upward perpendicular to the xz plane.

Note:

The latitude and longitude coordinate system only supports the WGS84 coordinate system. To convert other coordinate systems to WGS84, you can use the online tool: The World Coordinate Converter.

Function Configuration

Support for enabling latitude and longitude mapping is added in V4.1.0.

Enter the 3D custom scene component editing page, choose Scene > Camera > Coordinate System, select Enable Latitude and Longitude Mapping, and set the origin longitude and latitude coordinates.

Note:

1: You can retain up to six decimal places for the latitude and longitude coordinates, with the height defaulting to 0.

2: After latitude and longitude mapping is enabled, you can set latitude and longitude coordinates or 3D coordinates for all root node models in the scene. Child node models always retain their relative positional relationship with the parent node models and do not support setting latitude and longitude coordinates.

Origin Coordinate Preparation

This document uses the location of FanRuan Software Co., Ltd. as the origin. The latitude and longitude of FanRuan Software Co., Ltd. can be found via Amap.

Convert the coordinate system in Amap to the WGS84 coordinate system, and the location of FanRuan Software headquarters is obtained: 120.4404218078898, 31.585526253528332.

Enabling Latitude and Longitude Mapping

Enter the model editing page, choose Scene > Camera > Coordinate System, and configure the longitude and latitude. In this way, the latitude and longitude mapping configuration is completed.

You can configure the latitude and longitude for the root node (the FanRuan building), but you can only configure relative positions for child nodes.