Toolbar  Menu 


Curve Parabola > <Options> 
The Parabola command draws a parabolic curve.
Commandline options  

MarkFocus 
Places a point object at the focus location. 
Half 
Draws only half the parabola. 
Lets you pick a focus point, direction, and end location. Focus steps


Lets you pick a vertex point, a focus point, and an end location. Vertex steps

Toolbar  Menu 



The Parabola3Pt command draws a parabolic curve through three picked points.
Commandline options  

Mode 
The Mode options specify the function of picked point that does not specify an endpoint. FocusThe Focus option lets you pick two endpoints and a focus point. ThroughPointThe ThroughPoint option lets you pick two endpoints and a location for the parabola to pass through. VertexThe Vertex option lets you pick two end points and a vertex point. 
PickOrder 
DefaultThe Default option sets a start point, a second point that depends on the Mode setting, and then an endpoint. EndsFirstSpecify the endpoints first and then the focus, throughpoint, or vertex mode. EndsLastSpecify the focus, throughpoint, or vertex mode first and then the endpoints. 
MarkFocus 
Places a point object at the focus location. 
Toolbar  Menu 


Curve Hyperbola > <Options> 
The Hyperbola command draws a hyperbolic curve.
Commandline options  

Default 
The default option draws the hyperbola from the center, focus, and end. Center steps

FromCoefficient 
The FromCoefficient option uses the A and B coefficients of the hyperbola equation to define the curve. FromCoefficient steps
A / BThese are the A and B coefficients of the equation that defines the hyperbola. The A coefficient represents the distance from the center point to the vertex of the hyperbola. If C is the distance from the center point to the foci of the hyperbola, then B2 = C2  A2. The B coefficient can be considered the slope of the asymptotes. 
FromFoci 
The FromFoci option draws the hyperbola starting from the focus points. FromFoci steps

FromVertex 
The FromVertex option draws the hyperbola starting from the vertices. FromVertex steps

Drawing and display options  

MarkFoci 
Places point object at the focus locations.

BothBranches 
Both branches of the hyperbola are drawn.

ShowAsymptotes 
The asymptotes of the hyperbola are displayed as it is drawn.

Rhinoceros 6 © 20102019 Robert McNeel & Associates. 21Aug2019