When you create a mesh, you typically use the Mesh Buildup Wizard. If scan data is constituted by line-type point clouds, however, boundaries are not easy to maintain in their original shape while you generate the mesh.

If you manually triangulate using the 3D Triangulation command in the Addins menu, you will get better a result than the automatic Mesh Buildup Wizard method, as shown in the image below.

Method:
1. Before you apply triangulation on line-type scan data which is already aligned by a scan device, we recommend that you accurately align the scan sets again in the software. Select the Align button in the bottom pallet menu, or Click Tools > Scan Tools > Align in the menu.

Use the Global And Fine method with the “Apply Only Small Transform” option as shown in the below image. This option considers that the initial alignment is already done and accurately aligns scan shots, removing gaps among scan shots via small transformations. Plus, if overlapped regions have a planar shape, the alignment may slide along the planar area. This option prevents such featureless scan shots from sliding during alignment.

2. Apply the Addins > Combine command to make a single scan data set.

3. Click Add-ins > 3D Triangulate in the menu and check the “Assume Vertices Are Densely Placed Along A Direction” option. Especially, when you try to triangulate line type point cloud, this option is appropriate for keeping edges or boundaries as shown in the below image.

4. If necessary, execute the Enhance, Global Remesh and Fix Normal commands in Mesh mode to get a mesh which is well optimized and featured.

Objective:

The objective of this tutorial is to learn various alignment techniques. This involves 2 data set that are used for understandingthe following

1. How to align a mesh to desired co-ordinate system using reference geometries

2. How to align a mesh to desired co-ordinate system using already segmented region groups

3. How to align a mesh to a CAD/Design data

Pre-requisites:

None

Estimated Time:

45 minutes

Files Available for Download:

File Name:	File Type:	Size
Align.pdf Align_Data.zip Align.avi	Pdf Document Mesh & IGES File Video	0.63 MB 16.4 MB 25.7 MB

When you import long range scan data such as a building, a huge statue, a ship and so on, the origin of these data may be far from global origin of the application. Thus you may not normally work with these scan data in the application. One of problems is that you cannot create solid or surface body which is very far from global origin because of Parasolid limitations.

You can see the mesh data is positioned very far from global origin by creating a Ref. Point on the mesh such as shown in the image below.

If you try to create a surface using Extrude,

You cannot see the extrusion surface in the graphic window, even if it is registered in the Model and Feature Tree.

Solution

• When your imported scan data is very far from the global origin, you will be warned with the following message: “The center position of imported data is too far…”.

• After importing scan data, move the scan data to origin (0, 0, 0). Execute Tools > Align > Interactive Align command. Check the Pre-align With Global Origin and go to the next stage.

• Click OK. The mesh data is moved to the origin.

• Create the extrusion surface in the same way as before.

• Now you can see the extrusion surface without any problem.