Digitized Shape Editor
CATIA V5 Training
Student Notes:
Exercises
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Digitized Shape Editor
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Version 5 Release 19 January 2009 EDU_CAT_EN_DSE_FX_V5R19
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Digitized Shape Editor Student Notes:
Table of Contents Car Door: Master Exercise Presentation Car Door: Design Intent Car Door: Design Process
Master Exercise Step (1): Point Processing Master Exercise Step (2): Faceting the Cloud Do It Yourself
Master Exercise Step (3): Creating the curves and exporting the result Do It Yourself
Added Exercise - Hair Dryer
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Hair Dryer: Design Intent Hair Dryer: Design Process
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Digitized Shape Editor
Car Door
Student Notes:
Master Exercise Presentation 90 min
The purpose of this exercise is to practice the functionalities that you will learn usingout the course. At the end of each lesson, there will be an exercise step based on the lesson. In this exercise, you will extract characteristic curves of a Car Door. For that you have to perform the following steps.
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Point processing Faceting cloud of points Creating curves and exporting the result
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Digitized Shape Editor Student Notes:
Car Door: Design Intent
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The input to this exercise is Digitized Data which is obtained from scanning a car door.
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The objective is to extract the characteristic curves from the data. These characteristic curves can be used to obtain a product surface in Free Style workbench.
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Digitized Shape Editor Student Notes:
Car Door: Design Process 1 Processing Points
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Faceting the Cloud of points
3 Creating sections
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Digitized Shape Editor
Car Door
Student Notes:
Step 1 - Point Processing 30 min
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In this step you will: Import the cloud of points. Remove unnecessary points. Activate Area / Filter the Data. From this Area preserve the characteristic lines. Activate all points to check the result.
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Digitized Shape Editor Student Notes:
Do It Yourself (1/8) File to be used: Door.cgo
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Click the ‘Cloud Import’ button 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. Note: Use Fit All In if necessary. Use Manipulator to exclude unnecessary points from import. Use Apply to get the statistics displayed and confirm the creation by OK.
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Digitized Shape Editor Student Notes:
Do It Yourself (2/8) Clean the data by drawing rough contour around the required area. 1. Click the ‘Remove’ button and select the Cloud Data. You want to remove the Inside of the selection using a Polygonal Trap 2. Draw the polygonal contour and double-click to end the input of the contour. 3. Valid Trap will display the points in red that will be removed. Use OK to confirm the selection.
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Digitized Shape Editor
Do It Yourself (3/8)
Student Notes:
You will now reduce the number of points to about 18,000. Characteristic lines will be then clearly visible. 1. Click the ‘Filtering’ button and select the Cloud Data Choose an adaptative chord error of “0.12” 2. You can also specify a maximum distance between point in order to be sure to have a minimum density. 3. Use Apply to get the statistics displayed and confirm the filtering by OK.
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Digitized Shape Editor Student Notes:
Do It Yourself (4/8) The area of the connection to the window needs a more detailed description, let’s focus on this area. 1. Click the ‘Activate’ button and select the cloud data. Use option Polygonal Trap, Inside Trap. 2. Draw carefully your polygonal contour. 3. Use Valid Trap to display the result and OK to confirm this sampling. 2 1
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Digitized Shape Editor Student Notes:
Do It Yourself (5/8) 1. Click the ‘Activate’ button and select the Cloud Data. Use option Outside, Polygonal Trap. 2. Draw carefully your polygonal contour. 3. Use Valid Trap to display the result and OK to confirm this sampling.
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Points from this area are filtered
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Digitized Shape Editor Student Notes:
Do It Yourself (6/8) As the first sampling was done without Physical removal, you can now ‘de-filter’ to a chord error 0.07 1. Click the ‘Filtering’ button and select the Cloud Data. Choose the Adaptative method with a Chord error of “0.07”. 2. Use Apply to get the statistics displayed and confirm the filtering by OK.
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Areas of fillets look more clear now
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Digitized Shape Editor Student Notes:
Do It Yourself (7/8) Let’s repeat this process onto the different characteristic lines. Use Activate / Deactivate all to restore the whole set of points then Activate one characteristic line, Filter it to chord error 0.07. Refine the density of points to get a good partition showing the characteristic lines.
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Areas to rework
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Digitized Shape Editor
Do It Yourself (8/8)
Student Notes:
Reactivate all the filtered points from the cloud and get the following result.
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Use menu Activate and select the Cloud Data. Use option 'Activate All' .
Open the part CATDSE_CarDoor_Step1_End.CATPart
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Digitized Shape Editor
Car Door
Student Notes:
Step 2 - Faceting the Cloud 30 min
In this step you will:
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Mesh the model. Clean the Mesh. Optimize the Mesh.
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Digitized Shape Editor Student Notes:
Do It Yourself (1/4) Open: CATDSE_CarDoor_Step2_Start.CATPart Create a mesh on the data. 1. Click the ‘Mesh Creation’ button and select the Cloud Data. Display in Smooth Shading mode. 2. Set up your Neighborhood parameter so that you do not create holes (“21” is a good value). 3. Apply will display the Mesh. Use OK to confirm the selection.
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Default Neighborhood parameter
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Neighborhood parameter = 21
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Digitized Shape Editor Student Notes:
Do It Yourself (2/4) Clean the mesh. 1. Use Cloud Display Option- ‘Non-Manifold’ to check non-manifold elements. 2. Use the Mesh Cleaner command to remove non-manifold edges from the mesh.
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The removed non-manifold edges leave holes in the mesh. Removing non-manifold edges may cause new non-manifold vertices. Therefore you may have to click Apply several times to correct all defects. On the other hand duplications and incorrect orientations are also corrected.
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Digitized Shape Editor
Do It Yourself (3/4)
Student Notes:
Optimize the mesh by Flip Edges.
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Use the Flip Edges command to optimize the mesh on characteristic lines (“2” is a good Depth value).
The display of the Mesh switches to Flat mode during the action.
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Digitized Shape Editor Student Notes:
Do It Yourself (4/4) Fill the holes. 1. Simple holes can be filled by ‘Fill Holes’ command. 2. Check the result with Mesh Cleaner to remove new non-manifold edges and vertices if any.
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3. The remaining holes can be filled by ‘Interactive Triangle Creation’ command. 4. Check the result with Mesh Cleaner to remove new non-manifold edges and vertices if any.
WARNING: when creating triangles manually, make sure you do not create new non-manifold edges! Anyway do no spend too much time filling holes, as it is not necessary for most downstream processes.
Open: CATDSE_CarDoor_Step2_End.CATPart
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Digitized Shape Editor
Car Door
Student Notes:
Step 3– Creating the curves and exporting the result. 30 min
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In this step you will: Create planar sections on the mesh. Create curves from these sections. Draw characteristic lines on the mesh.
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Digitized Shape Editor Student Notes:
Do It Yourself (1/9) Open: CATDSE_CarDoor_Step3_Start.CATPart Draw curves with ‘3D Curve’ using points of the mesh and trim the mesh with the help of these curves. 1. Switch to ‘Left View’. 2. Draw curves around the mesh to define a clean boundary. You can for example create 10 curves connected and tangent to each other.
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3. Split the mesh by the created curves. 4. Use Projection type “Along a direction” and “Y axis” direction. 5. Put “Keep” mark anywhere on the part of the mesh to keep.
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Digitized Shape Editor Student Notes:
Do It Yourself (2/9) Create sections on meshed model. 1. 2. 3. 4.
Click the ‘Planar Sections’ button and select the meshed model. Select ‘Flip to YZ plane’, key in ‘Number’ and ‘Step’ values clear “Grouped” check box. Drag the handle to position your sections. Apply will display the result. Use OK to confirm the creation.
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Digitized Shape Editor Student Notes:
Do It Yourself (3/9) Switch the display of scans to points. 1. Right-click the scan, go to properties and choose point option from Display Modes tab. 2. Apply will display the result. Use OK to confirm the option.
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3. To better see the points you may have to change the symbol for points, edit the scan properties and set the symbol you want.
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Digitized Shape Editor Student Notes:
Do It Yourself (4/9) From the scan you just created, create curves to be able to use them in Free Style applications. 1. 2. 3. 4.
Click the ' Curve From Scan'button and select the cloud data. Use option Smoothing. Use OK to confirm the creation of the curve. Repeat the process for each planar section. 1
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Digitized Shape Editor Student Notes:
Do It Yourself (5/9) It is very convenient, to use the lighting capabilities to emphasize the characteristic lines. 1. Activate Lightning. 2. Move the White Cylinder and check the result on your model.
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Confirm when you visualize the Characteristic Lines at their best.
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Digitized Shape Editor Student Notes:
Do It Yourself (6/9) Draw Curves on the mesh 1. 2. 3. 4.
Click the ‘Create Scans on Cloud’ button. Select points on the mesh. Double-click the last point to validate the scan. Click the ‘Create Curves from Scans’ button to create the curve.
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Create Scans on cloud
Create Curves from Scans
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Draw the curve on the model using shadows to locate the characteristic lines.
Create 3D Curve
Repeat the process for each characteristic line.
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Digitized Shape Editor
Do It Yourself (7/9)
Student Notes:
Create sections on your meshed model. To do this, first activate only the area you will focus on.
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Use the tool ‘Activate’ to limit the area of the meshed model you work on.
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Digitized Shape Editor Student Notes:
Do It Yourself (8/9) Create 6 sections on your meshed model. 1. Click the ‘Planar Section’ button and select the meshed model. 2. Cut in YZ plane, using option ' Number'(6), and ' Step'(100)
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Digitized Shape Editor
Do It Yourself (9/9)
Student Notes:
From the scans you just created, create curves to be able to use them in Free Style applications. Use Curve from Scan to create a network of curves representing the shape.
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You reach this kind of net of curves that you can use in Free Style to create surfaces.
Open: CATDSE_CarDoor_Step3_End.CATPart
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Digitized Shape Editor
Added Exercise - Hair Dryer
Student Notes:
Exercise Presentation 75 min
In this exercise, you will create mesh from the Digitized data of Hair Dryer. For that you have to perform following steps.
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Import several clouds of points. Align the cloud of points. Create mesh. Offset the mesh.
You will require the following CATIA licenses to perform the exercise: 1. HD2. slt 2. DSE. prd 3. DSS. prd
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Digitized Shape Editor Student Notes:
Hair Dryer: Design Intent
The objective is to create the mesh using number of clouds and then offset the cloud to take into account thickness of the hair dryer.
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The input to this exercise is Digitized Data which is obtained from scanning a hair dryer.
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Digitized Shape Editor Student Notes:
Hair Dryer: Design Process
From Points
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Align Clouds
Mesh the Cloud
Offset
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To Export
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Digitized Shape Editor
Do It Yourself (1/14)
Student Notes:
Load: CATDSE_HairDryer_Start.CATPart Import the data. 1. As a first step import file DryerBody.ascii 2. Then import 2 files which represent geometry of the handle: DryerHandle1.ascii and DryerHandle2.ascii as ' Grouped' .
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Files to be used: 1. DryerBody.ascii 2. DryerHandle1.ascii 3. DryerHandle2.ascii
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Digitized Shape Editor Student Notes:
Do It Yourself (2/14) In case you have not completed step 1 use: CATDSE_HairDryer_Import.CATPart Align the Clouds of Points. 1. Roughly align the two clouds using “Align using the compass” tool. 2. Then align the two clouds precisely using ‘Align by Best Fit’ tool.
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Remember: Areas to fit should be equal in size and identical in shape.
Cloud of points
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Roughly align the two clouds
Align the two clouds precisely
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Digitized Shape Editor
Do It Yourself (3/14)
Student Notes:
Merge the two clouds of points together.
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Use menu Cloud Union to merge the two aligned clouds of points.
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Digitized Shape Editor
Do It Yourself (4/14)
Student Notes:
Reducing the number of points.
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Activate the Filtering menu and decrease the number of points using chordal error “0.075”, so that you just keep enough points for the next step.
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Digitized Shape Editor
Do It Yourself (5/14)
Student Notes:
Meshing the data. 1. Cut your model in sub-area using ‘Activate’. 2. Mesh the different sub-areas setting adapted specifications. 3. Do not forget to activate the option ‘Constrained’.
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Digitized Shape Editor
Do It Yourself (6/14)
Student Notes:
Union of the elementary meshes.
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Merge all the constrained elementary meshes by picking in the tree.
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Digitized Shape Editor
Do It Yourself (7/14)
Student Notes:
Improve the quality of the mesh.
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Remove defects such as Non manifold edges, wrong orientation.
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Digitized Shape Editor
Do It Yourself (8/14)
Student Notes:
Fill the holes Use menu ‘Fill Hole’ to complete the mesh if necessary.
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‘Interactive Triangle Creation’ can be used as well to fill holes.
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Digitized Shape Editor
Do It Yourself (9/14)
Student Notes:
Improve the characteristic lines.
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Improve the characteristic lines by using the ‘Flip Edge’ function.
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Digitized Shape Editor
Do It Yourself (10/14)
Student Notes:
Improve the quality of the mesh.
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Improve the quality of the mesh, by smoothing locally where the two digits did not match very well.
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Digitized Shape Editor
Do It Yourself (11/14)
Student Notes:
In order to take the thickness into account, offset the mesh.
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1. Create the offset “2mm” of the Mesh. 2. Activate the ‘Create Scan’ option.
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Digitized Shape Editor
Do It Yourself (12/14)
Student Notes:
In order to create a rough stock use ‘Rough Offset’ tool. 1. 2. 3. 4. 5. 6.
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Hide the mesh created in previous step, and select original mesh. Click Rough Offset icon. Create the rough offset “7mm” of the mesh. choose ‘Granularity’ of “2mm”. Use the Both sides option. Use Mesh cleaner to check that the mesh is valid. (no non-manifold edges or vertices). Use ‘Fill Holes’ to check that the mesh is closed.
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Digitized Shape Editor
Do It Yourself (13/14)
Student Notes:
We aim at creating a rough stock with the fuzzy offset, so we do not need a high precision mesh level. Hence, optimize the mesh.
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1. 2. 3. 4.
Select the rough offset mesh, then click ' Optimize' . Change the ‘triangles’ range of dimension. Set the Dihedral Angle to 30 degrees. Select the Analysis option to display the deviations.
Load: CATDSE_HairDryer_End.CATPart
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Digitized Shape Editor
Do It Yourself (14/14)
Student Notes:
You may export your mesh as an stl file to send it to another system for example for manufacturing or rapid prototyping. Select the optimized mesh, then click Export. Select a folder and give a name. Select the STL format. Click Save.
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