IntersectionTests

Methods

<static> grazingAltitudeLocation

Provides the point along the ray which is nearest to the ellipsoid.

Parameters:

Name	Type	Description
ray	Ray	The ray.
ellipsoid	Ellipsoid	The ellipsoid.

Returns:

Cartesian The nearest planetodetic point on the ray.

<static> lineSegmentPlane

Computes the intersection of a line segment and a plane.

Parameters:

Name	Type	Argument	Description
endPoint0	Cartesian3		An end point of the line segment.
endPoint1	Cartesian3		The other end point of the line segment.
plane	Plane		The plane.
result	Cartesian3	<optional>	The object onto which to store the result.

Returns:

Cartesian3 The intersection point or undefined if there is no intersection.

Example

var origin = ellipsoid.cartographicToCartesian(Cesium.Cartographic.fromDegrees(-75.59777, 40.03883, 0.0));
var normal = ellipsoid.geodeticSurfaceNormal(origin);
var plane = Cesium.Plane.fromPointNormal(origin, normal);

var p0 = new Cesium.Cartesian3(...);
var p1 = new Cesium.Cartesian3(...);

// find the intersection of the line segment from p0 to p1 and the tangent plane at origin.
var intersection = Cesium.IntersectionTests.lineSegmentPlane(p0, p1, plane);

<static> rayEllipsoid

Computes the intersection points of a ray with an ellipsoid.

Parameters:

Name	Type	Description
ray	Ray	The ray.
ellipsoid	Ellipsoid	The ellipsoid.

Returns:

Object An object with the first (start) and the second (stop) intersection scalars for points along the ray or undefined if there are no intersections.

<static> rayPlane

Computes the intersection of a ray and a plane.

Parameters:

Name	Type	Description
ray	Ray	The ray.
plane	Plane	The plane.

Returns:

Cartesian3 The intersection point or undefined if there is no intersections.

<static> trianglePlaneIntersection

Computes the intersection of a triangle and a plane

Parameters:

Name	Type	Description
p0	Cartesian3	First point of the triangle
p1	Cartesian3	Second point of the triangle
p2	Cartesian3	Third point of the triangle
plane	Plane	Intersection plane

Returns:

Object An object with properties positions and indices, which are arrays that represent three triangles that do not cross the plane. (Undefined if no intersection exists)

Example

var origin = ellipsoid.cartographicToCartesian(Cesium.Cartographic.fromDegrees(-75.59777, 40.03883, 0.0));
var normal = ellipsoid.geodeticSurfaceNormal(origin);
var plane = Cesium.Plane.fromPointNormal(origin, normal);

var p0 = new Cesium.Cartesian3(...);
var p1 = new Cesium.Cartesian3(...);
var p2 = new Cesium.Cartesian3(...);

// convert the triangle composed of points (p0, p1, p2) to three triangles that don't cross the plane
var triangles = Cesium.IntersectionTests.lineSegmentPlane(p0, p1, p2, plane);