CATIA DSE_数字化编辑器

统计 : • This check box will allow you to get information in the statistics window (number of points, dimensions…)
Apply : when you are satisfied with your import parameters, use Apply then OK to create the Cloud Import entity
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投一条线在点云上
Project Curves: Used to project 1 or several curves onto a Cloud of Points
Principle : • The curve is discrete in a number of points that are projected on the Cloud of Points according to a direction. The 3 closest points from the cloud are located. The result is the intersection of the closest facet with the direction of projection. • The result is a Scan typed as Curve Projection Discretization • Number of Points: to be computed on the curve to be then projected on the Cloud of Point (non faceted cloud only). Chordal error: For tessellation only. Chordal error used to create points to be projected onto the faceted cloud Working Distance: The distance used to locate the points eligible to compute the 3 closest points to the projection. (non facetted cloud only) Try increasing this number if the result does not contain enough points
• The activated points are those that appear in red during the selection • By default, as shown above, the trap is displayed in the view plane. It is thus a 2D trap. • You can rotate the model to display it as a 3D trap. • You can modify the shape of the trap using the green arrows that appear on the edges of the trap. • Non active points are still in the Clouds of Point element, you can restore it when desired. •If displayed as a shaded tessellation, the result will not be visible. You should display the tessellation as triangles to visualize the result
Options : • Sampling: allows to import a certain percentage of the Digitized data, be careful, this will be done sequentially every x points will be kept. • Scale Factor: the scan is very often performed on a scaled model, you may want to work on real size model, apply the given scale factor • File Unit: your CATIA session is set up for a given unit. The file you import comes from the outside world and may be digitized in another unit. Set up the proper unit before importing the file
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减少数据量
Global :
• Activate all will activate the whole Cloud of points • Swap will switch the activated by the ‘de-activated’ elements Selection : • Pick : will allow to select by picking elements on screen. The element type is filtered by the options from Level • Trap: Will allow the selection through a contour trap see explanation on trap type. The trap is drawn in a plane but has a depth. Then you may change the trap by the manipulators of the Trap.
CATIA 逆向工程（1）
曲面数字化编辑器
Digitized Shape Editor
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工具
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调入点数据 (1/2)
Cloud import : 在使用这个模块时，首先就需要将数据调入 CATIA
格式 :
• 可以在此栏中进行格式选择 选择输入文件 : • Direction 和 Delimiters 用来进行 scans. • Atos 是控制点的质量（去除无效点）， 数值从 0 到 255 (由低到高)，那么低于此值的点将被忽略 。
• Outside Trap:
Level: In coordination with Pick can be set to:
Point Scan/Gr as many areas as you wish by clicking Apply and drawing another trap, until you click OK to validate and exit the action.
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清理数据 (1/2)
Global : • Select all will select the whole Cloud of points • Swap 选则转换
Selection : • Pick : will allow selection by picking elements on screen. The element type is filtered by the options from Level • Trap: Will allow the selection through a contour trap see explanation on trap type. The trap is drawn in a plane but has a depth. Then you may change the trap by the manipulators of the Trap.
Remove: 从点云上去除点。
Trap Type : • 选择方式
Selected Part , 选择方向: • Inside Trap:
• Outside Trap:
Level: In coordination with Pick can be set to:
Point Scan/Grid Digit Cloud Triangle
Activate: This action is used to define active set of points from a Cloud of Points Trap Type : • It can be either Rectangular or Polygonal trap contour Selected Part , it can be: • Inside Trap:
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清理数据(2/2)
Filtering: 过滤
Homogeneous: enter the value of the Sphere radius, used to filter the points. The filtering sphere is visualized by a green sphere. You can change its position by a simple mouse click at a desired location
Statistics will be then displayed, that is : • Before application, The number of points to be processed. • After Application, the number, and the percentage of the remaining points