Rational Points
QuickDraw 3D defines three- and four-dimensional rational points as pairs and triples of floating-point numbers, together with a floating-point weight. You'll use theTQ3RationalPoint4D
data type for defining control points of rational surfaces and solids. TheTQ3RationalPoint4D
data type represents homogeneous points in four-dimensional space. To get the equivalent three-dimensional point, divide the point'sx
,y
, andz
components by thew
component.
typedef struct TQ3RationalPoint3D { float x; float y; float w; } TQ3RationalPoint3D; typedef struct TQ3RationalPoint4D { float x; float y; float z; float w; } TQ3RationalPoint4D;
Field Description
x
- The x coordinate (abscissa) of a rational point.
y
- The y coordinate (ordinate) of a rational point.
z
- The z coordinate of a rational point.
w
- The weight of a rational point.
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