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Home : Tools & Menus : Menus : Preferences :
Preferences > Construction optionsSets the options that control the modeling of NURBS curves and surfaces, including tolerances and units of measure.
 | Previous: Preferences > User options > Save options, Retrieve options |
This tool or menu item is used in the following pages.
 | Data transfer Use the tolerances required by a specific CAD package How do I Use the tolerances required by a specific CAD package How do I Set up construction options How do I Make all normals consistent How do I Convert surfaces to and from shells (stitch/unstitch) How do I Trim a surface How do I Check continuity between curves How do I Check objects for modeling problems How do I Prepare model for import into CAD system How do I Check the deviation and continuity on surface edges How do I Sweep generation curves along rail curves (Rail) How do I Create a surface inside four boundary curves or corners (Square) Sketching Set up StudioTools for sketching Sketching Create digital tape drawings |
If you want to change a set of presets, use the Copy button to create a copy of the set you want to edit, then edit the copy.
Preferences > User options > Save options.Copy the highlighted settings profile to a new profile.
If you want to change some of the settings in one of the presets (for example, SDRC), make a copy of the preset profile, then edit the copy.
Delete the highlighted settings profile.
You cannot delete the preset settings profiles.
Click a profile to use the settings in that profile.
The preset profiles (for example, SDRC) contain the settings needed for best compatibility with various CAD systems.
Check this box to show Scale Factor sliders for the unit choices (Main Units, Sub Units, and Pos Units).
Use the scale factor sliders to change a unit from whole to fractional or multiple units. For example:
The unit of measurement for all linear measurements (in locators, on the prompt line and in windows).
The intermediate level of linear units.This is the unit of the second number when you type numbers using the m:s or m:s:p form on the prompt line. This unit is only used in keyboard input.
The smallest level of linear units. This is the unit of the last number when you type numbers using the m:s:p form on the prompt line. This unit is only used in keyboard input.
Set the grid spacing to 1.0 of the current Main Unit (taking into account the scaling factor, if set).
Check this box to show Scale Factor sliders for the unit choices (Main Units, Sub Units, and Pos Units).
Use the scale factor sliders to change the different units from whole to fractional or multiple. For example:
The unit of measurement for all angular measurements (in locators, on the prompt line and in windows).
Choose Deg (degrees), Min (minutes), Sec (seconds), or Rad (radians). The default is degrees.
The intermediate level of angular units.This is the unit of the second number when you type numbers using the m:s or m:s:p form on the prompt line. This unit is only used in keyboard input.
Choose Deg (degrees), Min (minutes), Sec (seconds), or Rad (radians). The default is minutes.
The smallest level of angular units. This is the unit of the last number when you type numbers using the m:s:p form on the prompt line. This unit is only used in keyboard input.
Choose Deg (degrees), Min (minutes), Sec (seconds), or Rad (radians). The default is seconds.
The value and units of the maximum distance allowed between two points for the system to consider them coincident (occupying the same space).
The sampling rate for curve fit constraints such as Continuity Angle and Curve Fit Distance.
The maximum number of spans to create when building surfaces.
The maximum distance allowed between two curves or two surfaces for the system to consider them contiguous (touching).
The maximum angle allowed between two surface normals for the system to consider the normals pointing in the same direction.
A smaller value gives better continuity, but usually requires tools to add more spans to the surface.
The maximum deviation allowed in curvature.
A smaller value gives better continuity, but requires tools to add more spans to the surface.
Used to calculate which surface is adjacent to which surface when a tool needs to know the topology of the model. This is used by 
Object Edit > Normal tools > Unify Normals, 
Evaluate > Continuity > Surface continuity, and 
Evaluate > Check model.
Note
This should be set to a value greater than Maximum Gap Distance.
The maximum deviation allowed between the original curve-on-surface and trim edges.
The maximum distance allowed between endpoints of different curves-on-surface for the system to consider them continuous for the purposes of defining a trim region.
In example A, the gap between the two curves-on-surface is greater than Max Gap Between Curves, so the curves do not define an area.
In example B, the gap between the curves-on-surface is within Max Gap Between Curves, so the curves define an area for the purpose of trimming.
The maximum distance allowed between polyset vertices for the system to consider them coincident (occupying the same space).
Choose whether the surface creation tools create NURBS surfaces or Polysets.
Note
Do not turn these options on unless you understand what rational geometry is and why you need it. In most cases, rational geometry is slower and harder to model with.
Create new primitives using rational geometry.
Create new fillets and rounds (that is, surfaces created by the Fillet and Round tools) using rational geometry.
Create all other new curves and surfaces (that is, all curves and all surfaces that are not primitives, fillets or rounds) using rational geometry.
Choose a value from the pop-up menu to adjust the size of the font used in the modeling windows for annotations and such text.
Choose either Scale or Fixed Size. Fixed size will display at a constant size; Scale will change based on Dollying and Zooming.
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