Jan 19, 2009 - CATIA V5 Training. Exercises. Version .... Some practice of control point manipulation required. Time and skills ..... Connect curve. Project curve.
Version 5 Release 19 January 2009 EDU_CAT_EN_CTS_FX_V5R19
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Cloud to Surface Student Notes:
Table of Contents Cloud data preparation Do It Yourself
Surface based approach Do It Yourself
Curve based approach Do It Yourself
QSR Network approach Do It Yourself
QSR Automatic approach
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18 19
30 31
36 37
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Do It Yourself
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Cloud to Surface
Cloud data preparation
Student Notes:
Phase 1
30 min
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In this exercise you will: Import a cloud of points and prepare it for the following design work. This preparation consists in reducing the number of points in a way that preserves the quality of the shape description
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Cloud to Surface
Do It Yourself (1/3)
Student Notes:
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Download on your disc the 3 cloud of points : Clouds.zip
Open a Digitized Shape Editor workbench Import the cloud of points Import Select files x00c.grk, y00c.grk, z00c.grk (Kreon format) Change the display of the cloud Tools> Options> Shape> Digitized Shape editor> Display Modes Activate point option and deactivate polyline option
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Cloud to Surface
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Do It Yourself (2/3)
Student Notes:
Clean the cloud Remove Use a trap to remove unnecessary points Filter the cloud Filter Choose the adaptative type, with a value of deviation that preserves the shape definition (example: 0.02mm) Create a triangular mesh Mesh creation Use the 3D mesher and tune the neighbourhood parameter Suppress holes by Fill Hole or Interactive Triangle Creation to suppress holes Remove unnecessary triangles if any
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Cloud to Surface
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Do It Yourself (3/3)
Student Notes:
Open a FreeStyle workbench Start/Shape/FreeStyle Create curves 3D curves Choose type Near Points Select points on the mesh to create curves
You can load: 01_Mesh_BaseCurves.CATPart
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Cloud to Surface
Surface based approach
Student Notes:
Phase 2
2 hours
In this exercise you will: See how to create surfaces from a cloud of points in a surface based approach.
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Characteristics of the surface based approach: Intuitive creation of surfaces Full control of shape via control points Real time feed back thanks to analysis tools Efficient for quick surface creation (no strict accuracy expected) Drawbacks: Some practice of control point manipulation required Time and skills required grow very fast with expected quality No associativity to support design changes
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Cloud to Surface Student Notes:
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Do It Yourself (1/10)
Return to a Digitized Shape Editor workbench Create scans for first base surface Planar sections Choose direction, step (20 mm), limit curves Hide the mesh
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Load: 01_Mesh_BaseCurves.CATPart
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Cloud to Surface
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Do It Yourself (2/10)
Student Notes:
Return to a FreeStyle workbench Create a basic patch 4-Point patch Select points on the curves Apply a planar section analysis to the patch Cutting planes Use same location, direction and step as for the scans
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Cloud to Surface
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Do It Yourself (3/10)
Student Notes:
Fit the basic patch to the cloud manually Control points Modify the control points (normal direction) to superimpose the sections with the scans Measure the deviation Distance analysis Measure the deviation between the surface and the cloud
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Cloud to Surface
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Do It Yourself (4/10)
Student Notes:
Fit the basic patch to the cloud automatically Fit to geometry Fit the surface to the scans Check the surface quality Control points Correct control points if their distribution has become irregular
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Cloud to Surface
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Do It Yourself (5/10)
Student Notes:
Repeat the same process for the second main surface Planar sections 4-Point patch Cutting planes Control points (for manual fitting to scans outside the pocket area) Distance analysis (ignore the distance in the pocket area)
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Cloud to Surface Student Notes:
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Do It Yourself (6/10)
Repeat the same process for the third main surface Planar sections 4-Point patch Cutting planes Control points Distance analysis Fit to geometry
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You can load: 02_BasePatches.CATPart
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Cloud to Surface
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Do It Yourself (7/10)
Student Notes:
Blend the first two main surfaces FreeStyle Blend Surface Display continuities and tensions to tune the blend surface
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Cloud to Surface
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Do It Yourself (8/10)
Student Notes:
Create trimming curves on the third main surface FreeStyle Blend Curve Display continuities and tensions to tune the blend surface Break the trimming curves on the third main surface Break curve
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Cloud to Surface
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Do It Yourself (9/10)
Student Notes:
Break the third main surface Break surface Blend the main surfaces FreeStyle Blend Surface
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Cloud to Surface Student Notes:
Do It Yourself (10/10)
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Fill the remaining hole Fill
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You can load: 03_End_of_SurfaceBased.CATPart
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Cloud to Surface
Curve based approach
Student Notes:
Phase 3
2 hours
In this exercise you will: See how to create surfaces from a cloud of points in a curve based approach.
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Characteristics of the curve based approach: Strict control of shape via their input curves Feature approach (associativity between surfaces and curves) Efficient for quality surface creation (strict accuracy expected) The quality of surfaces relies on the quality of input curves Drawbacks: Abstract approach, with some geometric knowledge required Less efficient for quick design because of time needed for curve creation
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Cloud to Surface
Do It Yourself (1/11)
Student Notes:
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Load: 01_Mesh_BaseCurves.CATPart
Return to a Digitized Shape Editor workbench Create scans for first base surface Planar sections Choose direction, step, limit curves Also create one plane in the perpendicular direction Hide the tessellated cloud
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Cloud to Surface
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Do It Yourself (2/11)
Student Notes:
Return to a FreeStyle workbench Create a curve on the first scan 3D Curve Select Through Points and pick some points on the scans Check the curve quality with a curvature analysis Porcupine curvature analysis Select the curve and check that its curvature is regular (otherwise change it or start again a new curve)
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Cloud to Surface
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Do It Yourself (3/11)
Student Notes:
Create curves on other scans (same method) 3D Curve Select Through Points and pick some points on the scans You may also check the distance between the curves and the scans Distance analysis
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Cloud to Surface
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Do It Yourself (4/11)
Student Notes:
Create the first main surface Net surface Select the profiles and guides Check the distance between the surface and the scans Distance analysis If the expected accuracy is not reached, create more profiles and edit the net to add them
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Cloud to Surface
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Do It Yourself (5/11)
Student Notes:
Create the scans on the second main surface Planar sections Create the curves from the scans (ignore pocket area) 3D curve Check the distance between the curves and the scans Distance analysis
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Cloud to Surface
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Do It Yourself (6/11)
Student Notes:
Create the second main surface Net surface Check the distance between the surface and the scans Distance analysis Correct the curves or add more curves if the expected accuracy is not reached
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Cloud to Surface
Do It Yourself (7/11)
Student Notes:
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Create six curves for the last main surface 3D curve Create the last main surface Net surface
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Cloud to Surface Student Notes:
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Do It Yourself (8/11)
Start a Generative Shape Design workbench Blend the two boundary curves with a curvature continuity Connect curve Create the first blend surface FreeStyle Sweep Choose Sweep and Fit Impose a curvature continuity with the main surfaces
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You can load: 04_Base_NetSurfaces.CATPart
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Cloud to Surface
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Do It Yourself (9/11)
Student Notes:
Round the sharp corner of the third main surface Connect curve Project curve Split Create the profile for the last sweep Connect curve
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Cloud to Surface
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Do It Yourself (10/11)
Student Notes:
Create the last blend surface FreeStyle Sweep
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Cloud to Surface Student Notes:
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Do It Yourself (11/11)
Check the distance between the surface and some points of the cloud Filter Distance analysis Modify the input of the FreeStyle Sweeps if necessary to improve the accuracy
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You can load: 05_End_of_CurveBased.CATPart
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Cloud to Surface
QSR Network approach
Student Notes:
Phase 4
2 hours
In this exercise you will: See how to create surfaces from a cloud of points using Quick Surface Reconstruction (QSR).
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Characteristics of QSR: Creation of surfaces by Powerfit or canonic shape recognition Efficient for quality surface creation (if no strict accuracy expected) The quality of surfaces relies on the quality of input curves Drawbacks: Not efficient for high quality design such as class A design
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Cloud to Surface
Do It Yourself (1/5)
Student Notes:
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Load: 06_Begin_QSR.CATPart
Access the Quick Surface reconstruction workbench Split the cloud according to its character lines Curvature analysis
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Cloud to Surface
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Do It Yourself (2/5)
Student Notes:
Create surface boundaries 3D curve Planar section Project curve Curve from scan
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Cloud to Surface
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Do It Yourself (3/5)
Student Notes:
Prepare curves for Powerfit Curve Slice Clean contour
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Cloud to Surface
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Do It Yourself (4/5)
Student Notes:
Create surfaces Powerfit
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Cloud to Surface Student Notes:
Do It Yourself (5/5)
Load: 08_Begin_QSRNetwork.CATPart
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OTHER POSSIBILITY with QSR: Create network Curves Network Create a surface Surfaces Network
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You can load: 08_End_QSRNetwork.CATPart
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Cloud to Surface
QSR Automatic approach
Student Notes:
Phase 5
2 hours
In this exercise you will: See how to create surfaces from a cloud of points using The Automatic Surface command of QSR.
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Characteristics of Automatic Surface: Very rapid surface creation Possibility to control accuracy Easy to use because of few parameters to control Very efficient for rough surface creation or to quickly replace a cloud by a smooth surface Drawbacks: Mesh needs to be manifold and seamless No control on the face structure of the resulting surface
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Cloud to Surface
Do It Yourself (1/4)
Student Notes:
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Load: 090_QSRAutomaticSurface.CATPart
Check that the cloud is valid for Automatic Surface Create free edges Mesh Cleaner Repair mesh defects if any
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Cloud to Surface
Do It Yourself (2/4)
Student Notes:
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Create a rough surface Automatic Surface Analyze surface accuracy and quality
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Cloud to Surface
Do It Yourself (3/4)
Student Notes:
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Improve surface edge Automatic Surface Check result
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Cloud to Surface
Do It Yourself (4/4)
Student Notes:
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Improve surface accuracy Automatic Surface Check result
Jan 19, 2009 - Build a surface from a cloud of points, using Digitized Shape Editor for the ... 2 hours. In this exercise you will: See how to create surfaces from a ...
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