sphrs

A (work in progress) general purpose spherical/solid harmonics library in Rust.

Documentation: stable, master.

Types of spherical/solid harmonics

This crate supports these types of real and complex functions via the enums RealSHType and ComplexSHType:

• Spherical
• RegularSolid and IrregularSolid

Usage

Add this to your Cargo.toml:

toml [dependencies] sphrs = "0.1.0"

Examples

Compute the complex spherical harmonic function of degree 2 and order 1 at (spherical) position (r = 1.0, theta = PI/4, phi = PI/4):

```rust use sphrs::{ComplexSHType, Coordinates, SHEval}; use std::f64::consts::PI;

let sh = ComplexSHType::Spherical; let degree = 2; let order = 1; let p: Coordinates = Coordinates::spherical(1.0, PI/4.0, PI/8.0); println!("SH ({}, {}): {:?}", degree, order, sh.eval(degree, order, &p)); ```

Compute all real SH up to 5th degree at (Cartesian) position (1, 0, 0):

rust use sphrs::{RealSHType, HarmonicsSet, Coordinates}; let degree = 5; let sh: HarmonicsSet<f64, _, _> = HarmonicsSet::new(degree, RealSHType::Spherical); let p = Coordinates::cartesian(1.0, 0.0, 0.0); println!("SH up to degree {}: {:?}", degree, sh.eval(&p));

Acknowledgements

This crate is heavily inspired by Google's spherical-harmonics library and follows the design documented here.

References

• Robin Green, "Spherical Harmonic Lighting: The Gritty Details"
• Spherical harmonics (Wikipedia)
• Solid harmonics (Wikipedia)

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

License: MIT OR Apache-2.0