SphericalHarmonics3

Represents a third-order spherical harmonics (SH). Light probes use this class to encode lighting information.

Constructor

SphericalHarmonics3()

Creates a new instance of SphericalHarmonics3.

Properties

.coefficients : Array

An array holding the (9) SH coefficients. A single coefficient is represented as an instance of Vector3.

Methods

.add (sh : SphericalHarmonics3) : this

sh - The SH to add.

Adds the given SH to this instance.

.addScaledSH (sh : SphericalHarmonics3, scale : Number) : this

sh - The SH to add.
scale - The scale factor.

A convenience method for performing .add() and .scale() at once.

.clone () : SphericalHarmonics3

Returns a new instance of SphericalHarmonics3 with equal coefficients.

.copy (sh : SphericalHarmonics3) : this

sh - The SH to copy.

Copies the given SH to this instance.

.equals (sh : SphericalHarmonics3) : Boolean

sh - The SH to compare with.

Returns true if the given SH and this instance have equal coefficients.

.fromArray (array : Array, offset : Number) : this

array - The array holding the numbers of the SH coefficients.
offset - (optional) The array offset.

Sets the coefficients of this instance from the given array.

.getAt (normal : Vector3, target : Vector3) : Vector3

normal - The normal vector (assumed to be unit length).
target - The result vector.

Returns the radiance in the direction of the given normal.

.getIrradianceAt (normal : Vector3, target : Vector3) : Vector3

normal - The normal vector (assumed to be unit length).
target - The result vector.

Returns the irradiance (radiance convolved with cosine lobe) in the direction of the given normal.

.lerp (sh : SphericalHarmonics3, alpha : Number) : this

sh - The SH to interpolate with.
alpha - The alpha factor.

Linear interpolates between the given SH and this instance by the given alpha factor.

.scale (scale : Number) : this

scale - The scale factor.

Scales this SH by the given scale factor.

.set (coefficients : Array) : this

coefficients - An array of SH coefficients.

Sets the given SH coefficients to this instance.

.toArray (array : Array, offset : Number) : Array

array - (optional) The target array.
offset - (optional) The array offset.

Returns an array with the coefficients, or copies them into the provided array. The coefficients are represented as numbers.

.zero () : this

Sets all SH coefficients to 0.

Static Methods

.getBasisAt (normal : Vector3, shBasis : Array) : undefined

normal - The normal vector (assumed to be unit length).
shBasis - The resulting SH basis.

Computes the SH basis for the given normal vector.

Source

For more info on how to obtain the source code of this module see this page.