MDynSweptTriangle Class Reference
[OpenMayaFX - API module for effects]

#include <MDynSweptTriangle.h>

List of all members.

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Detailed Description

Class for evaluating surfaces as triangles over time.

MDynSweptTriangle provides access to surfaces (Nurbs and Polys) defined as triangles. It can only be accessed with the MFnDynSweptGeometryData class that is provided as an output from the geoConnector node.

The class provides parametric time evaluation for a triangle. Time is in the range 0 to 1, where 1 represents the current frame and 0 represents the previous frame. In this way you can get interpolated values of a triangle in motion.

Examples:

simpleFluidEmitter.cpp, and sweptEmitter.cpp.

Public Member Functions
	MDynSweptTriangle ()
	~MDynSweptTriangle ()
MVector	vertex (int vertexId, double t=1.0)
MVector	normal (double t=1.0)
MVector	normalToPoint (double x, double y, double z, double t=1.0)
MVector	uvPoint (int vertexId)
double	area ()

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Constructor & Destructor Documentation

MDynSweptTriangle::MDynSweptTriangle

(

)

The class constructor.

MDynSweptTriangle::~MDynSweptTriangle

(

)

The class destructor.

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Member Function Documentation

MVector MDynSweptTriangle::vertex	(	int	vertexId,
		double	t = 1.0
	)

Return the vertex requested by id, at the parametric time value.

Parameters:

[in]	vertexId	index 0, 1, or 2
[in]	t	time value in the range 1.0 to 0.0 t=1.0 is the current frame t=0.0 is the previous frame

Returns:

The vertex position.

Examples:

simpleFluidEmitter.cpp, and sweptEmitter.cpp.

MVector MDynSweptTriangle::normal

(

double

t = 1.0

)

Given a parametric time specified by 't', returns the normal of the triangle.

Parameters:

[in]

t

time value in the range 1.0 to 0.0 t=1.0 is the current frame t=0.0 is the previous frame

Returns:

A normalized vector

MVector MDynSweptTriangle::normalToPoint	(	double	x,
		double	y,
		double	z,
		double	t = 1.0
	)

Given a point, returns the normal of the triangle in the direction towards the point. Determines which side of the triangle to return the normal.

Parameters:

[in]	x	x component of the point
[in]	y	y component of the point
[in]	z	z component of the point
[in]	t	time value in the range 1.0 to 0.0 t=1.0 is the current frame t=0.0 is the previous frame

Returns:

A normalized vector

MVector MDynSweptTriangle::uvPoint

(

int

vertexId

)

Given a vertex id, this method returns the UV point for the vertex as a MVector.

Parameters:

[in]

vertexId

Id of the vertex for retrieving the UV point.

Returns:

A vector. The u and v values are stored in the first two coordinates. The third coordinate is not meaningful.

Examples:

simpleFluidEmitter.cpp.

double MDynSweptTriangle::area

(

)

This method returns the area.

Returns:

The area, as double value.

Examples:

simpleFluidEmitter.cpp.