Circular Curve
2.0
Entity type is:c:enumerator:~kA3DTypeCrvCircle.
The canonical form is defined with an:c:struct:~A3DMiscCartesianTransformationData, its origin being the center of the circle and its vector X being the axis corresponding to zero parameter. The implicit parameterization is an angle expressed as radians in the range [0, 2PI].
A3DParameterizationDatalets you specify reparameterization and trim.
Here are parameterization examples:
- To specify the interval in radians, set``m_dCoeffA``to 1.0 and``m_dCoeffB``to 0.0. These parameter values specify an identity conversion.
- To specify the interval in degrees, set``m_dCoeffA``to PI/180 and``m_dCoeffB``to 0.0.``m_dCoeffA``is the ratio of radians to degrees.
Example of a circular arc
In the above example, the circular arc is in the XY plane (and therefore has an identity transformation), has radius**R**, and is restricted to the**[ t0 , t1 ]**interval.
If``m_dCoeffA``is 1.0 and``m_dCoeffB``is 0.0 and if the interval is defined as``t0=0``and``t1=PI/2``, then``t0``corresponds to the Cartesian coordinates (R,0,0) and``t1``to (0,R,0). These values for the``m_dCoeffA``and``m_dCoeffB``co-efficients indicate parameterization is in radians and starts at the X axis.
Radius must be greater than**0**.
Radius as a parameter can be modified by:c:struct:~A3DMiscCartesianTransformationDatawhen the transformation defines uniform scaling.
Returns
A3D_SUCCESSon success, or an error code on failure
Structures
Functions
