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Fledermaus Create Mesh Wizard

Create Mesh Wizard - Page 1


Create Mesh Wizard - Page 2



How to Start


Create Mesh Wizard from Create Menu


What it Does

The Create Mesh Wizard allows the user to create a mesh surface on a selected area with specified settings.

Normals Utilized for Creating a Mesh

If the mesh was created out of a point cloud by right clicking on a points object >> operations >> Create mesh, the field Normals is going to be added to the aforementioned object so that the user could color by the normals that were used as input to the mesh creation algorithm as the following figure illustrates.

General Description

Mesh Creation Algorithm

Poisson Surface Reconstruction 

Reconstructs a triangle mesh from a set of oriented 3D points by solving a Poisson system.

Delauney Triangulation

This is a very fast algorithm that creates a 2.5D triangulated surface.

When choosing the Delauney Triangulation Algorithm, the only customization setting that is changeable is the Output File name. The rest of the settings are set for the creation of the mesh.

Options

Depending on your choice of Algorithm you may be presented with a number of the following mesh creations options:

Minimum Resolution

This is the target width of the finest level of tree cells that will be used for surface reconstruction. A lower value will result in a higher resolution mesh. 

Samples Per Node

This value specifies the minimum number of sample points that should fall within an octree node as the octree construction is adapted to sampling density. For noise-free samples, small values in the range [1.0 - 5.0] can be used. For more noisy samples, larger values in the range [15.0 - 20.0] may be needed to provide a smoother, noise-reduced, reconstruction.

Normal Calculation

A  "normal" is a line or vector that is perpendicular to a given object. In 3D graphics it is most often used for calculating reflections on a surface. For our application, we are calculating the normal for each point, in an effort to identify what should be the inside or outside of the final surface. The normals have a large effect on the final mesh that is created, as the Poisson algorithm will try to create a surface that consistently wraps around the points, forming a complete surface. When you have adjacent points with very different normals, the final surface will either be fragmented, or have large "bubbles" as the surface wraps around itself.

Align Normals Toward

This field is only visible when Fixed Normals is chosen as the Normal Calculation.

The "Align Normals Toward" option allows the user to specify the primary direction from which the data was acquired. For most data sets, the default Z is the best choice. If trying to mesh a vertical surface (such as a quay wall), the X or Y options will work better.

Radius Search

This value specifies the size of a sphere around each point for which other points are  included when the PCL normal algorithm is being used. This value is also used as part of the density calculation.

Generate Density Scalar Field

This option calculates the number of input points that contribute to the final surface triangles, using the "Radius Search" value as a maximum distance. The density value is very useful for cropping out parts of the mesh that were created from a low number of points.

Output Coordinate System

Coordinate Reference System

This field contains the coordinate system the object will be projected in.

Output File

The output filename of the mesh.