playcanvas
Version:
Open-source WebGL/WebGPU 3D engine for the web
65 lines (64 loc) • 2.05 kB
JavaScript
var gsplatEvalSH_default = `
const SH_COEFFS: i32 = 3;
const SH_COEFFS: i32 = 8;
const SH_COEFFS: i32 = 15;
const SH_COEFFS: i32 = 0;
const SH_C1: half = half(0.4886025119029199);
const SH_C2_0: half = half(1.0925484305920792);
const SH_C2_1: half = half(-1.0925484305920792);
const SH_C2_2: half = half(0.31539156525252005);
const SH_C2_3: half = half(-1.0925484305920792);
const SH_C2_4: half = half(0.5462742152960396);
const SH_C3_0: half = half(-0.5900435899266435);
const SH_C3_1: half = half(2.890611442640554);
const SH_C3_2: half = half(-0.4570457994644658);
const SH_C3_3: half = half(0.3731763325901154);
const SH_C3_4: half = half(-0.4570457994644658);
const SH_C3_5: half = half(1.445305721320277);
const SH_C3_6: half = half(-0.5900435899266435);
fn evalSH(sh: ptr<function, array<half3, SH_COEFFS>>, dir: vec3f) -> half3 {
let d: half3 = half3(dir);
var result: half3 = SH_C1 * (-sh[0] * d.y + sh[1] * d.z - sh[2] * d.x);
let xx: half = d.x * d.x;
let yy: half = d.y * d.y;
let zz: half = d.z * d.z;
let xy: half = d.x * d.y;
let yz: half = d.y * d.z;
let xz: half = d.x * d.z;
result = result + (
sh[3] * (SH_C2_0 * xy) +
sh[4] * (SH_C2_1 * yz) +
sh[5] * (SH_C2_2 * (half(2.0) * zz - xx - yy)) +
sh[6] * (SH_C2_3 * xz) +
sh[7] * (SH_C2_4 * (xx - yy))
);
result = result + (
sh[8] * (SH_C3_0 * d.y * (half(3.0) * xx - yy)) +
sh[9] * (SH_C3_1 * xy * d.z) +
sh[10] * (SH_C3_2 * d.y * (half(4.0) * zz - xx - yy)) +
sh[11] * (SH_C3_3 * d.z * (half(2.0) * zz - half(3.0) * xx - half(3.0) * yy)) +
sh[12] * (SH_C3_4 * d.x * (half(4.0) * zz - xx - yy)) +
sh[13] * (SH_C3_5 * d.z * (xx - yy)) +
sh[14] * (SH_C3_6 * d.x * (xx - half(3.0) * yy))
);
return result;
}
`;
export {
gsplatEvalSH_default as default
};