RevolveUtil Namespace Reference

Functions
GEOMETRYCORE_API void	GenerateSweepCurve (const FVector3d &RevolutionAxisOrigin, const FVector3d &RevolutionAxisDirection, double DegreesOffset, double DegreesPerStep, double DownAxisOffset, int TotalNumFrames, TArray< FFrame3d > &SweepCurveOut)
GEOMETRYCORE_API void	WeldPointsOnAxis (TArray< FVector3d > &ProfileCurve, const FVector3d &RevolutionAxisOrigin, const FVector3d &RevolutionAxisDirection, double Tolerance, TSet< int32 > &ProfileVerticesToWeldOut)
GEOMETRYCORE_API bool	ProfileIsCCWRelativeRevolve (TArray< FVector3d > &ProfileCurve, const FVector3d &RevolutionAxisOrigin, const FVector3d &RevolutionAxisDirection, bool bProfileCurveIsClosed)
GEOMETRYCORE_API void	MakeProfileCurveMidpointOfFirstStep (TArray< FVector3d > &ProfileCurve, double DegreesPerStep, const FVector3d &RevolutionAxisOrigin, const FVector3d &RevolutionAxisDirection)

Function Documentation

GenerateSweepCurve()

void RevolveUtil::GenerateSweepCurve	(	const FVector3d &	RevolutionAxisOrigin,
		const FVector3d &	RevolutionAxisDirection,
		double	DegreesOffset,
		double	DegreesPerStep,
		double	DownAxisOffset,
		int	TotalNumFrames,
		TArray< FFrame3d > &	SweepCurveOut
	)

Generates a sweep curve with the initial frame at the origin and the rest rotated around the given axis.

Parameters

RevolutionAxisOrigin
RevolutionAxisDirection	Should be normalized.
DegreesOffset	Number of degrees to rotate the first frame.
DegreesPerStep	Number of degrees each frame is rotated from the previous
DownAxisOffset	Distance to move each frame up the axis from the previous (for spirals)
TotalNumFrames	Number of frames to create, including the first frame
SweepCurveOut	Output

MakeProfileCurveMidpointOfFirstStep()

void RevolveUtil::MakeProfileCurveMidpointOfFirstStep	(	TArray< FVector3d > &	ProfileCurve,
		double	DegreesPerStep,
		const FVector3d &	RevolutionAxisOrigin,
		const FVector3d &	RevolutionAxisDirection
	)

Shifts the profile curve in such a way that it becomes the midpoint of the first rotation step (i.e., rotates it back half a step while projecting it outward onto the plane passing through the profile).

ProfileIsCCWRelativeRevolve()

bool RevolveUtil::ProfileIsCCWRelativeRevolve	(	TArray< FVector3d > &	ProfileCurve,
		const FVector3d &	RevolutionAxisOrigin,
		const FVector3d &	RevolutionAxisDirection,
		bool	bProfileCurveIsClosed
	)

Returns true if the profile curve is counterclockwise relative to the rotation direction. I.e., if you are looking from the side with the revolution axis pointing up and the curve to the left of the axis, the curve should be counterclockwise. If the curve is not closed, the function looks at the bottom of the profile curve relative to the revolution axis and checks whether the outer edge of the bottom goes in the direction that it would on a counterclockwise curve (up, in our example).

Results are undefined if a fully revolved mesh would be self intersecting. Assumes that RevolutionAxisDirection is normalized.

WeldPointsOnAxis()

void RevolveUtil::WeldPointsOnAxis	(	TArray< FVector3d > &	ProfileCurve,
		const FVector3d &	RevolutionAxisOrigin,
		const FVector3d &	RevolutionAxisDirection,
		double	Tolerance,
		TSet< int32 > &	ProfileVerticesToWeldOut
	)

Checks the profile curve for points that lie within a particular tolerance of the revolution axis. If they are found, the points are projected directly onto the revolution axis and their indices are added to a set of welded points.

Assumes that RevolutionAxisDirection is normalized.