Splitting a Component
16. DRAW SPLIT LINE
This function will exit from the Split Line manager and produce the split line as wireframe geometry. The face sets are also coloured accordingly.
17. SPLIT
This function will exit from the Split Line manager and physically split the solid body using the user defined split line. The face sets are also coloured accordingly.
From within the split line manager select the Imprint Shadow option
Select the body to analyse – Select the solid model
Select this body to analyse
VISI Modelling – Splitting
Select the direction – Select the Z axis (confirm using RHM)
The result of the analysis should now be visible within the split line tree. To activate the tree it is necessary to press the ESC key.
As explained in the initial description of all the split line manager options, in some cases, redundant split line edges are produced. In this instance it is recommended to use the
‘Search Silhouette’ option to refine the results obtained from the other split line functions.
From within the split line manager select the Search SIlhouette option
Select the body to analyse – Select the solid model
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Selecting any edge set inside the tree will highlight the edge set within the CAD screen.
Selecting any edge using the right hand mouse button will display the following menu :
Using these options it is possible to remove a set from the list, remove all other sets from the list and also to zoom directly on the highlighted set.
Select this body to analyse
Select the direction – Select the Z axis (confirm using RHM)
Select the option to ‘Delete Redundant edges’
The result of the analysis should now be visible within the split line tree. To activate the tree it is necessary to press the ESC key.
You will now see that the result has changed. The 6 closed sets are the bottom edges of the windows on the 6 outer bosses. The 8 open sets are a mixture of edges around the outer and inner split line. Selecting each edge within the tree will highlight the relevant edge on the CAD screen.
Within this example there are some edge sets that are not required. These can be removed from the list by selecting inside the tree.
Select ‘Open Edge Set 7 & 8’ using the right hand mouse button.
Using the context sensitive menu, select the ‘Unmark Set’ option. This will remove this edge set from the tree
Select the ‘Unmark Set’ option
VISI Modelling – Splitting Note!
If Set 1 was Unmarked the other open edge sets move up one place, i.e. set 2 becomes set 1 etc.
i.e. You need to keep sets listed as 1 and 2 only set 7 & 8 needs to be unmarked.
Note that some edges are very small. It may be necessary to use the ‘Zoom In’ option to display the edge(s) before removing from the set.
The result of unmarking the redundant sets should leave six open sets:
Selecting each open set individually will highlight that together they almost complete the split line around the outer edge of the component. The requirement for a split line is to produce a closed set around the complete part.
On this model the result cannot be achived automatically as a closed set because there is a very slight undercut (where the two sets appear to meet).
For the purpose of this training example we are going to ignore this small area and use the Split Line Manager tools to join the two open sets together.
From within the tree, highlight ‘Open Set 1’ and select the ‘Edit’ icon.
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Slight undercut situation
Selecting this option will activate the edge selection. To join the two open sets together it is necessary to select the edges that will connect the two sets together. During the selection process, it is also possible to select existing edges (redundant) and these will be removed from the tree.
NOTE:
After performing this process on both sides of the component, four open set still remain.
Selecting “Set 1” in the split line tree will highlight that the split line has an extra edge selected that is not required to create a closed loop around the component. Zoom into the area shown below to unmark the selected edge.
New connecting edge
Redundant edges
Open Edges that need to be Unmarked to create
closed loop
VISI Modelling – Splitting
At this point you will still have four open sets.
Using the skills you have been shown up to this point investigate the open sets you have left and select the missing edges to create a single closed loop around the component.
If succesful, joining the four open sets will produce a closed set and the split line tree will only display closed sets.
With only closed sets inside the tree, we can select the
‘Analyse Face Sets’ icon to see the result of out split line.
After selecting the ‘Analyse Face Sets’ icon the display inside the tree will now display only two face sets
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Select the Face Sets using the right hand mouse button and select the
‘Goureaud shading with outline’
from the context sensitive Menu : Double click on Set 1 to expand the tree
Selecting “Open Edges” using the right hand mouse button will display the following menu :
Using the Unmark option it is possible to remove the final two Open Edges.
With the shading mode activate, it is possible to use the slider bar to simulate the component splitting.
To complete the component splitting, select the Split icon to accept the result.
Congratulations!
This completes the ‘Split Line Manager’ tutorial