[Tutorial] Conversion of point cloud data to 3D tiles - geosolutions-it/digital-twin-toolbox GitHub Wiki

This tutorial shows how to convert a point cloud in LAS format (.las file) to 3D Tiles.

See the Prerequisites section before starting this tutorial.

Objective

Create a point cloud in 3D Tiles format given as input data the 1916.las and 1916.tif. The 3D Tiles will be colorized with the RGB values from the 1916.tif ortophoto image.

The workflow graph is presented below, highlighting steps and tools:

graph LR;
    las("Point Cloud (.las)")-->las_processing[Processing with PDAL]-->py3dtiles-->3d_point_cloud((3DTiles));

Steps

Select the Pipelines menu item in the left sidebar and then click on the + Add Pipeline to create a new pipeline. In the Add Pipeline dialog enter Point Cloud as title and select the 1916.las from the asset dropdown then click on save.

A new pipeline is available in the table, click on the title to enter the edit page

Edit available fields with following values:

• Select the 1916.tif image inside the Image for colorization field
• Apply a vertical datum shift checking the Convert to ellipsoidal height field. The Cesium viewer expects altitude above the ellipsoid for this reason we need to convert it when the original data has elevation above the see level (as in the 1916.las file)
• Add a geometric error scale factor of 0.15

Generate 3D Tiles by clicking on the Run button. (The generated tileset can be downloaded from the user interface with the download icon near the SUCCESS status tag.)

Preview of generated 3D Tiles in Cesium.js by clicking on the tileset link under the SUCCESS status tag.