Copyright DASSAULT SYSTEMES CATIA Training Exercises Version 5 Release 8 February 2002 EDU-CAT-E-DSE-FX-V5R8 Digitized Shape Editor
Copyright DASSAULT SYSTEMES Table of Contents 1. Car Doorp.3 Processing Pointsp.6 Faceting the Cloudp.16 Creating curvesp Hair Dryerp.32 Processing Pointsp.35 Tessellating the Cloudp.41
Copyright DASSAULT SYSTEMES Master Exercise Car Door In this exercise you will learn how to process Digitized Data to get a faceted file and to create curves laying on the Points 2 hours. Illustration of the exercise
Copyright DASSAULT SYSTEMES Design Intent: Car Door The Digitized Data is a CGO file of nearly points First goal is to smartly decimate the number of points Second goal is to create a Tessellation of the digit Third goal is to create curves on this tessellation to prepare Reverse Engineering process Last Goal is to output a STL file from the tessellation
Copyright DASSAULT SYSTEMES Design Process: Car Door Processing Point Faceting the Cloud of points Creating sections 1 2 3
Copyright DASSAULT SYSTEMES Master Exercise Car Door (Step 1): Processing Points In this step you will learn how to decrease the number of points of your model 60 min. Illustration of the step
Copyright DASSAULT SYSTEMES Do It Yourself (1/9) Import file door.cgo, removing unnecessary points Remove unnecessary points Activate Area / Filter the Data from this Area to preserve the characteristic lines Activate all points to check the result Load: START.CATPart
Copyright DASSAULT SYSTEMES Do It Yourself (2/9) Activate the menu Cloud import and select the file Door.cgo. Be sure to activate Statistics to get information on the imported file Use Update to get a preview of the imported file Use Manipulator tp exclude unnecessary points from import. Use Apply to get the statistics diplayed and confirm the creation by OK You are importing a digit made of about points Importing the Data
Copyright DASSAULT SYSTEMES Do It Yourself (3/9) Activate the menu Remove and select the Cloud Data. You want to remove the Outside of the selection by using a Polygonal Trap Draw the polygonal contour and double click to end the input of the contour Valid Trap will display in red the points that will be removed. Use OK to confirm the selection Clean the Data by drawing a rough contour around the desired area. Rough cleaning of the Data
Copyright DASSAULT SYSTEMES Do It Yourself (4/9) Use Menu Filter and select the Cloud Data Chose an adaptative chord error of 0.12 Use Apply to get the statistics displayed and confirm the filtering by OK You are importing a digit made of about points Reduce the number of points Decrease the amount of point using Adaptative method. You should reduce the number of points to about Nb: the characteristic lines will then show very well 1 2
Copyright DASSAULT SYSTEMES Do It Yourself (5/9) Use menu Activate and select the cloud data. Use option Inside, Polygonal Trap. Draw carefully your polygonal contour Use Valid Trap to display the result and OK to confirm this sampling You are importing a digit made of about points Activate part of the cloud The area of the connection to the window need a more detailed description, lets focus on this area.
Copyright DASSAULT SYSTEMES Activate part of the cloud 1 2 We keep the window definition. Do It Yourself (6/9) Use menu Activate and select the Cloud Data. Use option Outside, Polygonal Trap Draw carefully your polygonal contour Use Apply to get the statistics displayed and confirm the selection by OK
Copyright DASSAULT SYSTEMES Refine window area Use menu Filter and select the Cloud Data. Choose a Chord error As the first sampling was done without Physical removal, you can now de-filter to a chord error 0.07 Do It Yourself (7/9) Use menu Filter and select the Cloud Data. Choose the Adaptative method with a Chord error of 0.07 Use Apply to get the statistics diplayed and confirm the filtering by OK
Copyright DASSAULT SYSTEMES Refine other characteristic area Lets repeat this process onto the different characteristic lines. Use Activate/activate all to restore the whole set of point then Activate one characteristic line, Filter it to chord error 0.07 Area to rework Do It Yourself (8/9) Refine the density of points to get a good repartition showing the characteristic lines
Copyright DASSAULT SYSTEMES Re-activate all points Now we will reactivate all the filtered points from the Cloud and we will get the following result. 1 Do It Yourself (9/9) Use menu Activate and select the Cloud Data. Use option Activate All
Copyright DASSAULT SYSTEMES Master Exercise Car Door (Step 2): Faceting the Cloud In this step you will learn how to trim the digit and to create a tessellation on the Cloud of Point 30 min.
Copyright DASSAULT SYSTEMES Do It Yourself (1/4) Project the limiting curve onto the tessellation Cut the extra points to retain only the inside of the limiting curve Tessellate the model Load: Load: Car-Door-step2.CATPart
Copyright DASSAULT SYSTEMES Do It Yourself (2/4) Use menu Project Curves and select the Cloud Data. Select the components of Curve.1. Apply will display the result. Use OK to confirm this projection Project the Curve onto the Digitized Data. You will get a new Scan Data named Curve Projection Be sure that the direction of projection is correctly set to Y using the Compass. Create the boundary of the door
Copyright DASSAULT SYSTEMES Do It Yourself (3/4) Trim the cloud to the contour Trimming the cloud Using the projected Curves draw a polygonal trap to trim the cloud of points. Activate menu Remove and select the Cloud Data. You want to remove the Outside of the selection by using a Polygonal Trap 1 Draw the Polygonal contour. Double click on the end point input to finish the input 2 Valid Trap will display in red the points that will be removed. Use OK to confirm the selection. 3
Copyright DASSAULT SYSTEMES Do It Yourself (4/4) Activate menu Tessellate and select the Cloud Data. Display in Smooth Shading mode. Set up your Neighborhood parameter so that you do not create holes (35 is a good value) Apply will display the tessellation. Use OK to confirm the selection. Tessellating the data The green sphere is displayed to visually set up the neighborhood parameter. Pick a point near unwanted holes to check what value to set up for this parameter.
Copyright DASSAULT SYSTEMES Master Exercise Car Door (Step 3): Creating curves In this step, you will create scans and curves on the tessellation. Goal is to get curves usable by Free Style. 30 min. Illustration of the step
Copyright DASSAULT SYSTEMES Do It Yourself (1/10) Create planar sections on the tessellation Create curves from these sections Draw characteristic lines on the tessellation Load: Car-Door-step2.CATPart
Copyright DASSAULT SYSTEMES Do It Yourself (2/10) Activate menu Planar Section and select the tessellated model. In YZ plane. Choose option Number (10) and Select Distinct Drag the Handle to position your sections Apply will display the result. Use OK to confirm the creation Creating sections You can create sections on you tessellated model. 1 or several new entity(ies) Planar Sections (scan) will be created 1 2 3
Copyright DASSAULT SYSTEMES Do It Yourself (3/10) Select the Scan and use menu Cloud Display Option. Choose Point option Apply will display the result. Use OK to confim the option Changing Point display Use Apply and OK to confirm the sections. 2 Switch the display of Scans to Points 1
Copyright DASSAULT SYSTEMES Do It Yourself (4/10) Use menu Activate and select the cloud data. Use option Inside, Polygonal Trap Use OK to confirm the Creation of the curve. Creating sections 1 2 From the scan you just created you may create curves to be able to use them in Free Style applications. Repeat the process for each Planar Section 2 1
Copyright DASSAULT SYSTEMES Do It Yourself (5/10) Activate Lightning Move the White Cylinder and check the result on your model. It is very convenient to use the lighting capabilities to emphasize the characteristic lines 2 1 Confirm when you visualize the Characteristic Lines the best Playing with Lightning
Copyright DASSAULT SYSTEMES Drawing curves on the tessellation Draw the curve on the model using shadows to locate the characteristic lines. 2 Repeat the process for each characteristic line + or Create Scans on cloud Create Curve in Space Do It Yourself (6/10)
Copyright DASSAULT SYSTEMES Do It Yourself (7/10) Use menu Activate to limit the area of the Tessellated model you work on Limiting the area for work You can create sections on your tessellated model. For this, first activate only the area you will focus on 1
Copyright DASSAULT SYSTEMES Do It Yourself (8/10) Activate menu Planar Section and select the tessellated model. Cut in YZ plane, using option Number (6), and Step (100) Creating sections 1 Create 6 sections on your tessellated model.
Copyright DASSAULT SYSTEMES Do It Yourself (9/10) Use Curve from Scan to create a network of curves representing the shape Smoothing sections From the scans you just created you may create curves to be able to use them in Free Style applications. You reach this kind of net of curves that you can use in Free Style to create surfaces
Copyright DASSAULT SYSTEMES Do It Yourself (10/10) Use menu Cloud Export and select the tessellation Chose Stl for File Type and give a file name. Exporting results From the scan you just created you may create curves to be able to use them in Free Style applications. 1 2
Copyright DASSAULT SYSTEMES Added Exercise Hair Dryer In this lesson you will learn how to recall several digits, align them, tessellate them and offset the tessellation 2 hours
Copyright DASSAULT SYSTEMES Design Intent: Hair Dryer The Digitized Data is an ascii file of nearly points Import Clouds of Points First goal is to align the Clouds of points and merge them into one Cloud of Point, keeping just enough points as necessary for next steps Second goal is to create a Tessellation of the digit Third goal is to create an offset of the tessellation
Copyright DASSAULT SYSTEMES Design Process : Hair Dryer Aligning Digits 1 Tessellating 2 From Points To reality
Copyright DASSAULT SYSTEMES Exercise Hair Dryer (Step 1): Processing Points In this step you will learn how to align several digits together 45 min. Illustration of the step
Copyright DASSAULT SYSTEMES Do It Yourself (1/5) Import files DryerBody.ascii and DryeHandle*.ascii in 2 steps Align both Clouds together and merge them into a single Cloud Filter to keep only necessary amount of points
Copyright DASSAULT SYSTEMES Do It Yourself (2/5) As a first step import file DryerBody.ascii Then import in one step the 2 files component of the handle: DryerHandle1. ascii and DryerHandle2. ascii Importing the data Import, in Ascii format, file DryerBody.ascii and in a second step, both filesDryerHandle1. ascii and DryerHandle2.ascii. The result is 2 Clouds Import entities
Copyright DASSAULT SYSTEMES Do It Yourself (3/5) Using Alignment menus, set te 2 Clouds in alignment. Alignment phase Now you need to align the 2 Clouds of Points. Try both methods: standard and with spheres Reference Cloud Area to fit
Copyright DASSAULT SYSTEMES Do It Yourself (4/5) Use menu Cloud Union to merge the 2 aligned Clouds of Points Cloud union Now you need to merge the 2 clouds of points together
Copyright DASSAULT SYSTEMES Do It Yourself (5/5) Activate the menu Filtering and decrease the number of points so that you just keep enough points for the next step: Tessellation Reducing the number of points You now need to decrease the number of points, using chordal error
Copyright DASSAULT SYSTEMES Exercise Hair Dryer (Step 2): Tessellating In this lesson you will create a tessellation on the Cloud then apply an offset of 2 mm 50 min.
Copyright DASSAULT SYSTEMES Do It Yourself (1/8) Tessellate the Cloud of Points Make the Union of the elementary tessellations Fill the remaining holes Flip some edges to better respect the characteristic lines Offset the tessellation of 2mm Load: Dryer-Step1.CATPart
Copyright DASSAULT SYSTEMES Do It Yourself (2/8) Using Tessellation menu check that acting on the whole Cloud will lead to a bad result Tessellating the data See that the result is bad in this area Tessellate using a sphere of 20 for Neighborhood. Do not create this tessellation but…../..
Copyright DASSAULT SYSTEMES Do It Yourself (3/8) Cut your model in sub-area to tessellate it Do not forget to activate the option Constrained Tessellating the data Using Activate/Tessellate by area using constrained option.
Copyright DASSAULT SYSTEMES Do It Yourself (4/8) Merge all the constrained elementary Tessellation by picking in the tree Union of the elementary tessellations the data
Copyright DASSAULT SYSTEMES Do It Yourself (5/8) Use menu Fill Hole to complete the tessellation Filling the holes Now we will use algorithms to fill the remaining holes.
Copyright DASSAULT SYSTEMES Do It Yourself (6/8) Improve the characteristic lines by using the Flip Edge function Flipping edges Lets now improve the characteristic lines.
Copyright DASSAULT SYSTEMES Do It Yourself (7/8) Using Cloud Display Options, check the non-manifold edges Correct the defects Checking the results Lets now check the results: overlapping, button holes… Correct these problems using Remove, then Activate, then Constrained Tessellation.
Copyright DASSAULT SYSTEMES Do It Yourself (8/8) Create the Offset (2mm) of the tessellation Activate the Create Scan option Offsetting the tessellation In order to take the thickness into account.
Copyright DASSAULT SYSTEMES