pointcloud_cleaning_intro

Tutorial #5 – Point cloud cleaning

Welcome to the 3DF Zephyr tutorial series. In this recipe, you will learn good practices when cleaning point clouds.

This tutorial is targeted to all 3DF Zephyr Versions, with some exceptions when noted.

You may use any dataset you like.

  • Step 1 – introduction

Manual editing is often used to remove noise in the generated point clouds, and although Pro and Aerial users usually can use the confidence removal tool in order to automatically clean the most noise out of the point cloud, sometimes some manual editing is in required for even better results.

  • Step 2 – Point cloud cleaning
pointcloud_cleaningclick to view fullscreen Load any dataset you wish to experiment with and make sure to have generated at least the sparse point cloud. You can now use the “point selection mode” (1) icon or the “polygon selection mode” (2) icon to enter the manual selection modes: with the first one, simply drag a square on the workspace and all the inside points will be selected (they will be highlighted in red), while with the second one, simply click the points of a polygon (and close the poligon so that the last point is the same initial point) – similiarly, all the selected points will be highlighted in red.

At this point, you can remove the selected points by clicking the “delete points” icon (5). The points will be deleted.

 

 

Another way to select points is by color: by clicking the “Select by color” button (3): by clicking this button a selection dialog will appear: simply pick the color of the points that you want to select (either with the color selector or by picking it on the scene) and all the colors that falls behind a certain (customizable) threhshold will be selected (and highlighted in red). You can then remove these points using the “delete points button” as usual. Please note that this tool applies to dense point clouds only.

Another tool that is worth mentioning is the “select by plane” tool (4). Simply move the plane where needed and all the points above the plane surface will be selected (and highlighted in red).

Pro and Aerial users may want to also use the “confidence “tool in order to remove the points in which Zephyr has less confidence, which in most cases also happen to be noise.

Finally, remember that there is a noise filtering reduction value in the advanced settings as well as different presets that have more or less noise filtering.

The same manual tools can be used to remove parts of meshes.

It’s usually a good idea to make a copy of the original point cloud before making changes, although you can quickly undo/redo these actions with CTRL+Z and CTRL+Y (or the undo and redo buttons).

The next tutorial will show how to record a movie directly inside Zephyr. Prcoeed to the next tutorial