1 – Aims

To know different basic 3D element editing tools.

Know post-processing programmes open to competent users at little or no cost.

To be familiar with programmes for checking and obtaining data on competent three-dimensional elements at minimal or no cost.

Use the above digital resources to implement them in three-dimensional data checking and enhancement workflows.

To deepen the knowledge of 3D models and their geometry, polygonal meshes, types and classifications.

To deepen the knowledge of 3D models and their cataloguing according to the polygons that make them up.

2 – Learning methodology

Students will read this tutorial and watch the video.

The content of this theoretical-practical video is focused on the student being able to get to know various conventional terrestrial photogrammetric technologies as well as their methodologies of action; showing the handling of attitudes and digital tools that the photogrammetric technician must learn.

In order to facilitate understanding, various aspects of the tools used that may be of importance for their use are explained, while the explanation is developed by means of 3 practical examples of the application of point clouds and three-dimensional data for post-processing, improvement of results and verification.

In order for the teacher to evaluate the use of the practice, each student will write a report and hand in their High Poly and Low Poly model, as well as the files that emanate from them, such as textures, polygon meshes, point clouds, Scalar Fiels, Histograms.

3 – Tutorial duration

Practice described in this tutorial corresponds to the management and repair of polygonal meshes. The explanatory development of the video is complemented with the content of this document, in which in addition to the explanation of the video, examples and practicable exercises that can be performed with the same methodology are also given, so that the development of this exercise could reach 5 hours.

4 – Necessary teaching resources

Computers compatible with RealityCapture requirements.

64bit machine with at least 8GB of RAM.

64bit Microsoft Windows version 7 / 8 / 8.1 / 10 or Windows Server version 2008+.

NVIDIA graphics card with CUDA 3.0+ capabilities and 1GB VRAM.

CUDA Toolkit 10.2, minimal driver version 441.22

5 – Contents and tutorial

5.1- RealityCapture

5.2- Meshlab

5.3 Cloud Compare

5.4- Video

6 – Deliverables

In order for the teacher to be able to assess the students’ progress, they will write a report of no more than 3 pages in length.

In this report, the student will explain the steps followed in practice, the difficulties encountered and the decisions taken. The report will be illustrated with photographs of the data capture and processing process, and the 3D file must also be submitted and uploaded to the Sketchfab platform.

7 – What have we learned?

Manage 3D elements after processing is complete.

Decrease the size of the exported file.

Know and differentiate between triangular and quad polygonal meshes.

Knowledge of High Poly and Low Poly models and their differences.

Knowledge and handling of different editing and 3D element management software tools.

Obtain quantitative information from the 3D model useful for verification, transparency and reporting.

8 – File to use in the tutorial

Project in RC (Reality Capture)

Geometric model in PLY format.

Meshlab, is a perfect programme to change the format of your 3D object, being able to export according to your needs: (nxs, nxz, 3ds, ply, stl, obj, off, wrl, dxf, dae, ctm, e57, xyz, json, u3d, idtf, x3d).

CloudCompare BIN project.