A bounding sphere with a center and a radius.
Create a bounding sphere around the unit cube
import {BoundingSphere} from '@math.gl/culling';
cont sphere = new BoundingSphere().fromCornerPoints(
[-0.5, -0.5, -0.5],
[0.5, 0.5, 0.5]
);
Sort bounding spheres from back to front
import {BoundingSphere} from '@math.gl/culling';
const spheres = [new BoundingSphere(...), new BoundingSphere(...), ...];
const cameraPosWC = ...;
spheres.sort(
(a, b) => b.distanceSquaredTo(b, cameraPosWC) - a.distanceSquaredTo(a.cameraPosWC)
);
class BoundingSphere implements
BoundingVolume
.
Computes a tight-fitting bounding sphere enclosing a list of 3D Cartesian points. The bounding sphere is computed by running two algorithms, a naive algorithm and Ritter's algorithm. The smaller of the two spheres is used to ensure a tight fit.
positions
An iterable (e.g. array) of points that the bounding sphere will enclose. Each point must have x
, y
, and z
properties.result
Optional object onto which to store the result.Returns
result
parameter or a new BoundingSphere
instance if one was not provided.See Bounding Sphere computation article
The center point of the sphere.
The radius of the sphere.
Creates a new BoundingSphere
center
=[0, 0, 0]
The center of the bounding sphere.radius
=0.0
The radius of the bounding sphere.Sets the BoundingSphere
from center and radius
center
=[0, 0, 0]
The center of the bounding sphere.radius
=0.0
The radius of the bounding sphere.Computes a bounding sphere from the two corner points of an axis-aligned bounding box. The sphere tighly and fully encompases the box.
corner
The minimum height over the rectangle.oppositeCorner
The maximum height over the rectangle.Computes a tight-fitting bounding sphere enclosing the provided array of bounding spheres.
boundingSpheres
The array of bounding spheres.Returns
result
parameter or a new BoundingSphere
instance if none was provided.Duplicates a BoundingSphere
instance.
Returns
BoundingSphere
instanceCompares the provided BoundingSphere
componentwise and returns true
if they are equal, false
otherwise.
right
The second BoundingSphere
.Returns
true
if left and right are equal, false
otherwise.Computes a bounding sphere that contains both the this and the right
bounding spheres.
right
The second BoundingSphere
.Computes a bounding sphere by enlarging the provided sphere to contain the provided point.
point
A point to enclose in a bounding sphere.Determines which side of a plane a sphere is located.
plane
The plane to test against.
ReturnsINTERSECTION.INSIDE
if the entire sphere is on the side of the plane the normal is pointingINTERSECTION.OUTSIDE
if the entire sphere is on the opposite sideINTERSECTION.INTERSECTING
if the sphere intersects the plane.Applies a 4x4 affine transformation matrix to a bounding sphere.
transform
The transformation matrix to apply to the bounding sphere.Computes the estimated distance squared from the closest point on a bounding sphere to a point.
point
The pointReturns
Applies a 4x4 affine transformation matrix to a bounding sphere where there is no scale The transformation matrix is not verified to have a uniform scale of 1. This method is faster than computing the general bounding sphere transform using {@link BoundingSphere.transform}.
@param {BoundingSphere} sphere The bounding sphere to apply the transformation to. @param {Matrix4} transform The transformation matrix to apply to the bounding sphere.
result
Optional object onto which to store the result.Returns
result
parameter or a new BoundingSphere
instance if none was provided.@example var modelMatrix = Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid); var boundingSphere = new BoundingSphere(); var newBoundingSphere = BoundingSphere.transformWithoutScale(boundingSphere, modelMatrix);
The distances calculated by the vector from the center of the bounding sphere to position projected onto direction plus/minus the radius of the bounding sphere.
If you imagine the infinite number of planes with normal direction, this computes the smallest distance to the closest and farthest planes from position that intersect the bounding sphere.
@param {BoundingSphere} sphere The bounding sphere to calculate the distance to. @param {Cartesian3} position The position to calculate the distance from. @param {Cartesian3} direction The direction from position. @param {Interval} [result] A Interval to store the nearest and farthest distances. @returns {Interval} The nearest and farthest distances on the bounding sphere from position in direction.
Creates a bounding sphere in 2D from a bounding sphere in 3D world coordinates.
@param {BoundingSphere} sphere The bounding sphere to transform to 2D. @param {Object} [projection=GeographicProjection] The projection to 2D.
result
Optional object onto which to store the result.Returns
result
parameter or a new BoundingSphere
instance if none was provided.This class was ported from Cesium under the Apache 2 License.