Triangle

Source (.js)Source (.d.ts)

Introduction

vtkTriangle is a cell which representant a triangle. It contains static method to make some computations directly link to triangle.

See Also

vtkCell

Methods

cellBoundary

Get the nearest cell boundary to the specified parametric coordinates and whether the point is inside or outside the cell.

Argument	Type	Required	Description
subId	Number	Yes	The sub-id of the cell.
pcoords	Vector3	Yes	The parametric coordinates.
pts	Vector2	Yes	The points of the cell.

computeNormal

Compute the normalized normal of a triangle composed of three points. The normal is returned in normal.

Argument	Type	Required	Description
v1	Vector3	Yes	The first point coordinate.
v2	Vector3	Yes	The second point coordinate.
v3	Vector3	Yes	The third point coordinate.
n	Vector3	Yes	The normal coordinate.

computeNormalDirection

Compute the normal direction according to the three vertex which composed a triangle. The normal is not normalized. The normal is returned in normal.

Argument	Type	Required	Description
v1	Vector3	Yes	The first point coordinate.
v2	Vector3	Yes	The second point coordinate.
v3	Vector3	Yes	The third point coordinate.
n	Vector3	Yes	The normal coordinate.

derivatives

Get the derivatives of the triangle at the specified parametric coordinates.

Argument	Type	Required	Description
subId	Number	Yes	- The sub-id of the triangle.
pcoords	Vector3	Yes	- The parametric coordinates.
values	Array[Number]	Yes	- The values at the points.
dim	Number	Yes	- The dimension.
derivs	Array[Number]	Yes	- The derivatives.

evaluateLocation

Determine global coordinates (x) from the given subId and parametric coordinates.

Argument	Type	Required	Description
pcoords	Vector3	Yes	The parametric coordinates.
x	Vector3	Yes	The x point coordinate.
weights	Array[Number]	Yes	The number of weights.

evaluatePosition

Evaluates whether the specified point is inside (1), outside (0), or indeterminate (-1) for the cell; computes parametric coordinates, sub-cell ID (if applicable), squared distance to the cell (and closest point if requested), and interpolation weights for the cell.

Argument	Type	Required	Description
x	Vector3	Yes	The x point coordinate.
closestPoint	Vector3	Yes	The closest point coordinate.
pcoords	Vector3	Yes	The parametric coordinates.
weights	Array[Number]	Yes	The number of weights.

extend

Method used to decorate a given object (publicAPI+model) with vtkTriangle characteristics.

Argument	Type	Required	Description
publicAPI		Yes	object on which methods will be bounds (public)
model		Yes	object on which data structure will be bounds (protected)
initialValues	ITriangleInitialValues	No	(default: {})

getCellDimension

Get the topological dimensional of the cell (0, 1, 2 or 3).

getParametricDistance

Get the distance of the parametric coordinate provided to the cell.

Argument	Type	Required	Description
pcoords	Vector3	Yes	The parametric coordinates.

interpolationDerivs

Compute the interpolation functions/derivatives

Argument	Type	Required	Description
derivs	Array[Number]	Yes	- The derivatives.

intersectWithLine

Compute the intersection point of the intersection between triangle and line defined by p1 and p2. tol Tolerance use for the position evaluation x is the point which intersect triangle (computed in function) pcoords parametric coordinates (computed in function) A javascript object is returned :

{
   evaluation: define if the triangle has been intersected or not
   subId: always set to 0
   t: parametric coordinate along the line.
   betweenPoints: Define if the intersection is between input points
}

Argument	Type	Required	Description
p1	Vector3	Yes	The first point coordinate.
p2	Vector3	Yes	The second point coordinate.
tol	Number	Yes	The tolerance to use.
x	Vector3	Yes	The point which intersect triangle.
pcoords	Vector3	Yes	The parametric coordinates.

intersectWithTriangle

Compute the intersection between two triangles.

Argument	Type	Required	Description
p1	Vector3	Yes	The first point coordinate of the first triangle.
q1	Vector3	Yes	The second point coordinate of the first triangle.
r1	Vector3	Yes	The third point coordinate of the first triangle.
p2	Vector3	Yes	The first point coordinate of the second triangle.
q2	Vector3	Yes	The second point coordinate of the second triangle.
r2	Vector3	Yes	The third point coordinate of the second triangle.

newInstance

Method used to create a new instance of vtkTriangle.

Argument	Type	Required	Description
initialValues	ITriangleInitialValues	No	for pre-setting some of its content