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Description
This surface type describes a conic surface as defined by the (x,y,z) positions of the conic focii, the (x,y,z) position of a point on the surface and selection of the eccentricity as either Ellipsoid or Hyperboloid. In the following table of equations, which define the functional form of the surface, a is the semi-major axis length and b is the semi-minor axis length.
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Ellipsoid
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Hyperboloid
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Functional Form
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Eccentricity
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Origin - Focus Distance
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Navigation
This feature can be accessed by selecting Conic Foci (Ellipsoid/Hyperboloid defined by two foci and a surface point) as the surface type on the SURFACE tab of a surface dialog box.
Controls
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Control
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Inputs / Description
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Defaults
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Logical Parent
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Name of Parent entity.
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Custom Element Name
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Name
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Name of surface supplied by user.
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Surf n
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Description
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Description of the surface.
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Traceable
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Surface can be raytraced.
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Checked
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Use for trimming only
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Never raytrace. Surface used for trimming only.
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Unchecked
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Surface Type
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Surface type.
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Conic Foci
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Surface Settings
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Focus
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Positions of Conic foci.
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(0,0,-0.5)(0,0,0.5)
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Point
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Any point on the surface.
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0,0,0.75
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Type
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Specifies shape of Conicoid (Ellipsoid, Hyperboloid)
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Ellipsoid
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OK
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Accept settings and close dialog box.
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Cancel
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Discard settings and close dialog box.
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Apply
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Accept settings and keep dialog box open.
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Help
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Access this Help page.
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Application Notes
Surface deformation
The Conic Focii is a "non-sagable" surface and therefore cannot be used as a deforming surface. A "sagable" surface is defined as single-valued in z.
Related Topics
Surface types summary
Create a new surface
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