Associated GIS: all roads lead to ue5 City

Part1 Preface

This article describes how to use UE5 Of Georeferencing Plug-in implementation UE5 And GIS Coordinate Association .

Part2 Introduction to coordinate system

The following coordinate systems are mainly involved here , Here's the picture

1、 Geography CRS Coordinate system
Express by latitude and longitude and altitude
latitude = Elevation distance relative to the equator , In degrees
longitude = Relative to the prime meridian （ Greenwich ） The azimuth of , In degrees
At an altitude of = Height relative to the reference ellipsoid , In meters
Angles are expressed in decimal , namely DMS（ Degrees, minutes and seconds ）.2、 The center of the earth CRS Coordinate system The center of the earth CRS Use Cartesian coordinates to define the position of any point on the planet , Where the origin is at the center of the planet .
origin = centrosphere X The axis points to the equator / Prime meridian （ Greenwich ） Point of intersection .Z The axis is aligned with the rotation axis of the earth .Y The axis is orthogonal to the first two axes .

3、 Northeast sky coordinate system
As shown in the above figure, the environment is a green square
It is agreed here that X Axis = Easting（ In the east ） = UE Of X Axis Y Axis = Northing（ north ）= UE Of Y Shaft inversion Z Axis = Up（ God ）= UE Of Z Axis

Part3 Modeling requirements

We use it 3dmax build BIM When modeling , Need to ensure that the model needs to be guaranteed X The axis points east 、Y The axis points straight north 、Z Axis pointing to sky . After that DataSmith Import UE5, At this point, the model can be connected with GIS Coordinate correct association .

Part4 The plug-in USES

1 establish GeoReferencingSystem

Create a... At the level GeoReferencingSystem object , The path is shown in the figure below , If you can't find it , Please set up Show Engine Content

Then choose Planet Shape In the shape of an ellipsoid , namely Round Planet. The coordinate system standard can be used by default .

Next , Set the latitude and longitude and geodetic height of the modeling origin . We need to cancel the above Origin Location in Projected CRS Can be entered . We do not use the coordinates of the projection coordinate system .

2 Latitude and longitude UE coordinate

adopt GeoGraphic to Engin The longitude and latitude can be converted into UE Coordinates of . The blueprint is used as follows ：

Transformation of other coordinate systems , You can refer to the following figure to realize .

3 Status bar tools

stay /GeoReferencing/UI/UMG_GeoStatusBar Example in UMG Control is added to the viewport , Will be displayed in various CRS Current view position in ： Projection 、 Geography and ECEF. Add to the viewport as follows ： The real-time display effect is as follows ：

4 Coordinate checker auxiliary control

There is a special editor helper control located in /GeoReferencing/UtilityWidgets/EUW_CoordinatesInspector in . If you run the control in the editor , It will display a panel , You can control the geographic registration coordinates of the view and the point under the mouse . We put this object in UE In the scene , You can know the coordinate information of the current scene . After running , Will show , The effect is as follows ：

Part5 summary

This chapter mainly introduces how to use Georeferencing The plug-in converts the longitude and latitude to UE Step of coordinates of .

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