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Custom/extended splat encoding ranges, Premultiplied alpha for hyper-saturated colors (#134)

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* Externalized SparkRenderer.maxPixelRadius and .minAlpha settings. Added to documentation. Added to examples/editor under Debug folder, moved sort32 there.

* Added SplatEncoding concept, applied individually to SparkRenderer (rgbMin/Max, lnScaleMinMax), SplatMesh (additionally sh1Min/Max, sh2, sh3). Updated examples/editor to control settings via gui. Updated all related code to pipe along settings where needed.
Added SparkRenderer.premultipliedAlpha to control blend mode and enable hyper-saturated color contributions by default.

* Fix SplatLoader not passing along encoding. Complete renaming to splat encoding.
This commit is contained in:
Andreas Sundquist
2025-07-23 10:04:24 -07:00
committed by GitHub
parent f4b4522c56
commit f60c2b0cf9
19 changed files with 568 additions and 149 deletions
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src/pcsogs.ts
+15 -6
View File
@@ -1,4 +1,5 @@
import { unzip } from "fflate";
import type { SplatEncoding } from "./PackedSplats";
import { type PcSogsJson, tryPcSogsZip } from "./SplatLoader";
import {
computeMaxSplats,
@@ -14,6 +15,7 @@ import {
export async function unpackPcSogs(
json: PcSogsJson,
extraFiles: Record<string, ArrayBuffer>,
splatEncoding: SplatEncoding,
): Promise<{
packedArray: Uint32Array;
numSplats: number;
@@ -72,6 +74,7 @@ export async function unpackPcSogs(
Math.exp(x),
Math.exp(y),
Math.exp(z),
splatEncoding,
);
}
},
@@ -116,7 +119,7 @@ export async function unpackPcSogs(
const g = SH_C0 * dc1 + 0.5;
const b = SH_C0 * dc2 + 0.5;
const a = 1.0 / (1.0 + Math.exp(-opa));
setPackedSplatRgba(packedArray, i, r, g, b, a);
setPackedSplatRgba(packedArray, i, r, g, b, a, splatEncoding);
}
},
);
@@ -178,9 +181,12 @@ export async function unpackPcSogs(
}
}
if (useSH1) encodeSh1Rgb(extra.sh1 as Uint32Array, i, sh1);
if (useSH2) encodeSh2Rgb(extra.sh2 as Uint32Array, i, sh2);
if (useSH3) encodeSh3Rgb(extra.sh3 as Uint32Array, i, sh3);
if (useSH1)
encodeSh1Rgb(extra.sh1 as Uint32Array, i, sh1, splatEncoding);
if (useSH2)
encodeSh2Rgb(extra.sh2 as Uint32Array, i, sh2, splatEncoding);
if (useSH3)
encodeSh3Rgb(extra.sh3 as Uint32Array, i, sh3, splatEncoding);
}
});
promises.push(shNPromise);
@@ -248,7 +254,10 @@ async function decodeImageRgba(fileBytes: ArrayBuffer) {
return rgba;
}
export async function unpackPcSogsZip(fileBytes: Uint8Array): Promise<{
export async function unpackPcSogsZip(
fileBytes: Uint8Array,
splatEncoding: SplatEncoding,
): Promise<{
packedArray: Uint32Array;
numSplats: number;
extra: Record<string, unknown>;
@@ -300,5 +309,5 @@ export async function unpackPcSogsZip(fileBytes: Uint8Array): Promise<{
extraFiles[name] = unzipped[full];
}
return await unpackPcSogs(json, extraFiles);
return await unpackPcSogs(json, extraFiles, splatEncoding);
}