modeling/geometries/geom3

Represents a 3D geometry consisting of a list of polygons.

Source:
See:
  • geom3 for data structure information.
Examples
colorize([0,0.5,1,0.6], cube()) // transparent ice cube
{
  "polygons": [
    {"vertices": [[-1,-1,-1], [-1,-1,1], [-1,1,1], [-1,1,-1]]},
    {"vertices": [[1,-1,-1], [1,1,-1], [1,1,1], [1,-1,1]]},
    {"vertices": [[-1,-1,-1], [1,-1,-1], [1,-1,1], [-1,-1,1]]},
    {"vertices": [[-1,1,-1], [-1,1,1], [1,1,1], [1,1,-1]]},
    {"vertices": [[-1,-1,-1], [-1,1,-1], [1,1,-1], [1,-1,-1]]},
    {"vertices": [[-1,-1,1], [1,-1,1], [1,1,1], [-1,1,1]]}
  ],
  "transforms": [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],
  "color": [0,0.5,1,0.6]
}

Methods

(static) clone(geometry) → {geom3}

Source:

Performs a shallow clone of the given geometry.

Parameters:
Name Type Description
geometry geom3

the geometry to clone

Returns:

a new geometry

Type
geom3

(static) create(polygonsopt) → {geom3}

Source:

Create a new 3D geometry composed of the given polygons.

Parameters:
Name Type Attributes Description
polygons Array <optional>

list of polygons, or undefined

Returns:

a new geometry

Type
geom3

(static) fromCompactBinary(data) → {geom3}

Source:

Construct a new 3D geometry from the given compact binary data.

Parameters:
Name Type Description
data TypedArray

compact binary data

Returns:

a new geometry

Type
geom3

(static) fromPoints(listofpoints) → {geom3}

Source:

Construct a new 3D geometry from a list of points. The list of points should contain sub-arrays, each defining a single polygon of points. In addition, the points should follow the right-hand rule for rotation in order to define an external facing polygon.

Parameters:
Name Type Description
listofpoints Array

list of lists, where each list is a set of points to construct a polygon

Returns:

a new geometry

Type
geom3

(static) fromPointsConvex(uniquePoints) → {geom3}

Source:

Construct a new convex 3D geometry from a list of unique points.

Parameters:
Name Type Description
uniquePoints Array

list of points to construct convex 3D geometry

Returns:

a new geometry

Type
geom3

(static) invert(geometry) → {geom3}

Source:

Invert the given geometry, transposing solid and empty space.

Parameters:
Name Type Description
geometry geom3

the geometry to invert

Returns:

a new geometry

Type
geom3

(static) isA(object) → {Boolean}

Source:

Determine if the given object is a 3D geometry.

Parameters:
Name Type Description
object Object

the object to interrogate

Returns:

true if the object matches a geom3

Type
Boolean

(static) toCompactBinary(geometry) → {TypedArray}

Source:

Return the given geometry in compact binary representation.

Parameters:
Name Type Description
geometry geom3

the geometry

Returns:

compact binary representation

Type
TypedArray

(static) toPoints(geometry) → {Array}

Source:

Return the given geometry as a list of points, after applying transforms. The returned array should not be modified as the points are shared with the geometry.

Parameters:
Name Type Description
geometry geom3

the geometry

Returns:

list of points, where each sub-array represents a polygon

Type
Array

(static) toPolygons(geometry) → {Array}

Source:

Produces an array of polygons from the given geometry, after applying transforms. The returned array should not be modified as the polygons are shared with the geometry.

Example
let sharedpolygons = toPolygons(geometry)
Parameters:
Name Type Description
geometry geom3

the geometry

Returns:

an array of polygons

Type
Array

(static) toString(geometry) → {String}

Source:

Create a string representing the contents of the given geometry.

Example
console.out(toString(geometry))
Parameters:
Name Type Description
geometry geom3

the geometry

Returns:

a representative string

Type
String

(static) transform(matrix, geometry) → {geom3}

Source:

Transform the given geometry using the given matrix. This is a lazy transform of the polygons, as this function only adjusts the transforms. See applyTransforms() for the actual application of the transforms to the polygons.

Example
let newgeometry = transform(fromXRotation(degToRad(90)), geometry)
Parameters:
Name Type Description
matrix mat4

the matrix to transform with

geometry geom3

the geometry to transform

Returns:

a new geometry

Type
geom3

(static) validate(object)

Source:

Determine if the given object is a valid 3D geometry. Checks for valid data structure, convex polygon faces, and manifold edges.

If the geometry is not valid, an exception will be thrown with details of the geometry error.

Parameters:
Name Type Description
object Object

the object to interrogate

Throws:

error if the geometry is not valid

Type
Error