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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Spark • Splat Painter</title>
<style>
html, body {
margin: 0;
height: 100%;
width: 100%;
background-color: black;
}
#canvas {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
outline: none; /* Remove default focus outline */
touch-action: none;
}
#mode-overlay {
position: absolute;
top: 20px;
left: 20px;
background: rgba(0, 0, 0, 0.8);
color: white;
padding: 12px 20px;
border-radius: 8px;
font-family: sans-serif;
font-size: 16px;
font-weight: bold;
z-index: 1000;
opacity: 0;
transition: opacity 0.3s ease;
pointer-events: none;
}
#mode-overlay.show {
opacity: 1;
}
</style>
</head>
<body>
<canvas id="canvas" tabindex="0"></canvas>
<div id="mode-overlay"></div>
<script type="importmap">
{
"imports": {
"three": "../js/vendor/three/build/three.module.js",
"three/addons/": "../js/vendor/three/examples/jsm/",
"@sparkjsdev/spark": "../../dist/spark.module.js",
"lil-gui": "../js/vendor/lil-gui/dist/lil-gui.esm.js"
}
}
</script>
<script type="module">
import {
dyno,
SparkRenderer,
SplatMesh,
RgbaArray,
readRgbaArray,
SparkControls,
writeSpz,
unpackSplat,
PackedSplats,
} from "@sparkjsdev/spark";
import * as THREE from "three";
import { getAssetFileURL } from "../js/get-asset-url.js";
import { GUI } from "lil-gui";
const PARAMETERS = {
controlsEnabled: true,
eraseEnabled: dyno.dynoBool(false),
brushEnabled: dyno.dynoBool(false),
undoEnabled: dyno.dynoBool(false),
brushDepth: dyno.dynoFloat(10.0),
brushRadius: dyno.dynoFloat(0.05),
brushOrigin: dyno.dynoVec3(new THREE.Vector3(0.0, 0.0, 0.0)),
brushDirection: dyno.dynoVec3(new THREE.Vector3(0.0, 0.0, 0.0)),
brushColorHex: "#ff00ff",
brushColor: dyno.dynoVec3(new THREE.Vector3(1.0, 0.0, 1.0)),
};
const MIN_BRUSH_RADIUS = 0.01;
const MAX_BRUSH_RADIUS = 0.25;
const MIN_BRUSH_DEPTH = 0.1;
const MAX_BRUSH_DEPTH = 100.0;
const assetID = "greyscale-bedroom.spz";
let currentSplatMesh = null;
let currentFileName = "painted-splat";
let currentSplatMeshOriginalRGBA = null;
function brushDyno(
brushEnabled,
eraseEnabled,
undoEnabled,
brushRadius,
brushDepth,
brushOrigin,
brushDirection,
brushColor,
originalRgba,
) {
const flatColor = dyno.dynoVec3(new THREE.Vector3(1.0, 1.0, 1.0));
const luminanceThreshold = dyno.dynoFloat(0.1);
return dyno.dynoBlock({ gsplat: dyno.Gsplat }, { gsplat: dyno.Gsplat }, ({ gsplat }) => {
if (!gsplat) {
throw new Error("No gsplat input");
}
let { center, rgb, opacity, index } = dyno.splitGsplat(gsplat).outputs;
const projectionAmplitude = dyno.dot(brushDirection, dyno.sub(center, brushOrigin));
const projectedCenter = dyno.add(brushOrigin, dyno.mul(brushDirection, projectionAmplitude));
const distance = dyno.length(dyno.sub(projectedCenter, center)); // distance from projected center to actual center
const isInside = dyno.and(dyno.lessThan(distance, brushRadius),
dyno.and(dyno.greaterThan(projectionAmplitude, dyno.dynoFloat(0.0)),
dyno.lessThan(projectionAmplitude, brushDepth)));
// Paint/erase mode: change RGB or alpha values for splats inside brush
const luminanceOld = dyno.div(dyno.dot(rgb, flatColor), dyno.dynoFloat(3.0));
const luminanceNew = dyno.div(dyno.dot(brushColor, flatColor), dyno.dynoFloat(3.0));
const weightedRgb = dyno.mul(brushColor, dyno.div(luminanceOld, luminanceNew));
const isLuminanceAboveThreshold = dyno.greaterThan(luminanceOld, luminanceThreshold);
let newRgb = dyno.select(dyno.and(dyno.and(brushEnabled, isInside), isLuminanceAboveThreshold), weightedRgb, rgb);
let newOpacity = dyno.select(eraseEnabled, dyno.select(isInside, dyno.dynoFloat(0.0), opacity), opacity);
// Undo mode: restore original RGBA for splats inside brush
const originalRgbaValue = readRgbaArray(originalRgba, index);
const originalRgbVec = dyno.vec3(originalRgbaValue);
const originalOpacityVal = dyno.swizzle(originalRgbaValue, "w");
newRgb = dyno.select(dyno.and(undoEnabled, isInside), originalRgbVec, newRgb);
newOpacity = dyno.select(dyno.and(undoEnabled, isInside), originalOpacityVal, newOpacity);
gsplat = dyno.combineGsplat({ gsplat, rgb: newRgb, opacity: newOpacity });
return { gsplat };
});
}
function paintableSplatMesh(
url,
brushEnabled,
eraseEnabled,
undoEnabled,
brushRadius,
brushDepth,
brushOrigin,
brushDirection,
brushColor,
originalRgba,
) {
const splatMesh = new SplatMesh({
url: url,
onFrame: ({ mesh, time }) => {
mesh.needsUpdate = true;
},
onLoad: () => {
splatMesh.worldModifier = brushDyno(
brushEnabled,
eraseEnabled,
undoEnabled,
brushRadius,
brushDepth,
brushOrigin,
brushDirection,
brushColor,
originalRgba,
);
splatMesh.splatRgba = new RgbaArray().fromPackedSplats({
packedSplats: splatMesh.packedSplats,
base: 0,
count: splatMesh.packedSplats.numSplats,
renderer,
});
splatMesh.updateGenerator();
},
});
return splatMesh;
}
const canvas = document.getElementById("canvas");
const renderer = new THREE.WebGLRenderer({ canvas, antialias: false });
renderer.setClearColor(new THREE.Color(0xaaffff), 1);
const scene = new THREE.Scene();
const spark = new SparkRenderer({ renderer });
scene.add(spark);
const controls = new SparkControls({
canvas: renderer.domElement,
});
const camera = new THREE.PerspectiveCamera(
50,
window.innerWidth / window.innerHeight,
0.01,
1000,
);
camera.position.set(0, 0, 0);
camera.lookAt(0, 0, -1);
scene.add(camera);
function handleResize() {
const width = canvas.clientWidth;
const height = canvas.clientHeight;
renderer.setSize(width, height, false);
camera.aspect = width / height;
camera.updateProjectionMatrix();
}
handleResize();
window.addEventListener("resize", handleResize);
async function loadSplatFromFile(url) {
if (currentSplatMesh) {
scene.remove(currentSplatMesh);
}
// Extract filename for export
currentFileName = url.split("/").pop().split("?")[0].split(".")[0] || "painted-splat";
// Create an empty RgbaArray that will be populated after the mesh loads
currentSplatMeshOriginalRGBA = new RgbaArray();
currentSplatMesh = await paintableSplatMesh(
url,
PARAMETERS.brushEnabled,
PARAMETERS.eraseEnabled,
PARAMETERS.undoEnabled,
PARAMETERS.brushRadius,
PARAMETERS.brushDepth,
PARAMETERS.brushOrigin,
PARAMETERS.brushDirection,
PARAMETERS.brushColor,
currentSplatMeshOriginalRGBA.dyno
);
currentSplatMesh.quaternion.set(1, 0, 0, 0);
scene.add(currentSplatMesh);
// Wait for the mesh to fully load before accessing packed data
await currentSplatMesh.initialized;
// Extract original RGBA directly from the packed splats
currentSplatMeshOriginalRGBA = new RgbaArray();
currentSplatMeshOriginalRGBA.fromPackedSplats({
packedSplats: currentSplatMesh.packedSplats,
base: 0,
count: currentSplatMesh.packedSplats.numSplats,
renderer: renderer
});
// Update the world modifier with the populated original RGBA
currentSplatMesh.worldModifier = brushDyno(
PARAMETERS.brushEnabled,
PARAMETERS.eraseEnabled,
PARAMETERS.undoEnabled,
PARAMETERS.brushRadius,
PARAMETERS.brushDepth,
PARAMETERS.brushOrigin,
PARAMETERS.brushDirection,
PARAMETERS.brushColor,
currentSplatMeshOriginalRGBA.dyno
);
currentSplatMesh.updateGenerator();
}
await loadSplatFromFile(await getAssetFileURL(assetID));
const raycaster = new THREE.Raycaster();
let isDragging = false;
// Mode overlay functionality
const modeOverlay = document.getElementById('mode-overlay');
let overlayTimeout;
function showModeOverlay(text) {
modeOverlay.textContent = text;
modeOverlay.classList.add('show');
// Clear any existing timeout
if (overlayTimeout) {
clearTimeout(overlayTimeout);
}
// Hide overlay after 2 seconds
overlayTimeout = setTimeout(() => {
modeOverlay.classList.remove('show');
}, 2000);
}
function updateRgba() {
if (currentSplatMesh) {
const newRgba = new RgbaArray();
newRgba.render({
renderer,
count: currentSplatMesh.packedSplats.numSplats,
reader: dyno.dynoBlock({ index: "int" }, { rgba8: "vec4" }, ({ index }) => {
const { gsplat } = currentSplatMesh.generator.apply({ index });
const { rgba } = dyno.splitGsplat(gsplat).outputs;
return { rgba8: rgba };
}),
});
currentSplatMesh.splatRgba.dispose();
currentSplatMesh.splatRgba = newRgba;
currentSplatMesh.updateGenerator();
}
}
renderer.domElement.addEventListener('pointermove', (event) => {
const clickCoords = new THREE.Vector2(
(event.clientX / renderer.domElement.width) * 2 - 1,
-(event.clientY / renderer.domElement.height) * 2 + 1,
);
raycaster.setFromCamera(clickCoords, camera);
const direction = raycaster.ray.direction.normalize();
PARAMETERS.brushDirection.value.x = direction.x;
PARAMETERS.brushDirection.value.y = direction.y;
PARAMETERS.brushDirection.value.z = direction.z;
PARAMETERS.brushOrigin.value.x = raycaster.ray.origin.x;
PARAMETERS.brushOrigin.value.y = raycaster.ray.origin.y;
PARAMETERS.brushOrigin.value.z = raycaster.ray.origin.z;
// Apply painting effect while dragging
if (isDragging) {
updateRgba();
}
});
renderer.domElement.addEventListener('pointerdown', (event) => {
isDragging = true;
updateRgba();
});
renderer.domElement.addEventListener('pointerup', (event) => {
isDragging = false;
});
renderer.domElement.addEventListener('pointerleave', (event) => {
isDragging = false;
});
const gui = new GUI();
// Instructions section
const instructions = {
brush: "Brush Mode",
erase: "Erase Mode",
undo: "Undo Mode",
none: "View Mode",
increase: "Increase Brush Size",
decrease: "Decrease Brush Size",
increaseDepth: "Increase Brush Depth",
decreaseDepth: "Decrease Brush Depth"
};
const instructionsFolder = gui.addFolder("Instructions");
instructionsFolder.add(instructions, "brush").name("1:").disable();
instructionsFolder.add(instructions, "erase").name("2:").disable();
instructionsFolder.add(instructions, "undo").name("3:").disable();
instructionsFolder.add(instructions, "none").name("Esc:").disable();
instructionsFolder.add(instructions, "increase").name("=:").disable();
instructionsFolder.add(instructions, "decrease").name("-:").disable();
instructionsFolder.add(instructions, "increaseDepth").name("]:").disable();
instructionsFolder.add(instructions, "decreaseDepth").name("[:").disable();
instructionsFolder.open();
const brushRadiusController = gui.add(PARAMETERS.brushRadius, "value", MIN_BRUSH_RADIUS, MAX_BRUSH_RADIUS, 0.01).name("Brush Radius");
const brushDepthController = gui.add(PARAMETERS.brushDepth, "value", MIN_BRUSH_DEPTH, MAX_BRUSH_DEPTH, 0.1).name("Brush Depth");
gui.addColor(PARAMETERS, "brushColorHex").name("Brush Color").onChange((value) => {
PARAMETERS.brushColor.value = new THREE.Color(value).convertLinearToSRGB();
console.log(PARAMETERS.brushColor.value);
});
// I/O functionality (load and export)
const ioOptions = {
filename: currentFileName,
maxSh: 0, // Painted splats don't preserve SH data
fractionalBits: 12,
loadFile: () => {
// Create file input element
const input = document.createElement('input');
input.type = 'file';
input.accept = '.spz,.ply';
input.onchange = async (e) => {
const file = e.target.files[0];
if (!file) return;
// Create a blob URL from the file
const url = URL.createObjectURL(file);
try {
await loadSplatFromFile(url);
console.log("Loaded file:", file.name);
// Update filename for export
ioOptions.filename = file.name.split(".")[0] || "painted-splat";
} catch (error) {
console.error("Error loading file:", error);
alert("Failed to load file. Make sure it's a valid SPZ or PLY file.");
} finally {
// Clean up the object URL
URL.revokeObjectURL(url);
}
};
input.click();
},
saveToSpz: async () => {
if (!currentSplatMesh) {
console.error("Export failed - currentSplatMesh:", !!currentSplatMesh);
alert("No splat mesh loaded for export.");
return;
}
try {
console.log("Starting SPZ export with painted changes...");
if (!currentSplatMesh.splatRgba) {
currentSplatMesh.splatRgba = spark.getRgba({
generator: currentSplatMesh,
rgba: currentSplatMesh.splatRgba
});
currentSplatMesh.updateGenerator();
}
const rgba = new RgbaArray();
rgba.render({
renderer,
count: currentSplatMesh.packedSplats.numSplats,
reader: dyno.dynoBlock({ index: "int" }, { rgba8: "vec4" }, ({ index }) => {
const { gsplat } = currentSplatMesh.generator.apply({ index });
const { rgba } = dyno.splitGsplat(gsplat).outputs;
return { rgba8: rgba };
}),
})
const rgbaBytes = await rgba.read();
const ogSplats = currentSplatMesh.packedSplats;
const totalSplats = ogSplats.numSplats;
console.log("Total splats:", totalSplats);
let nonZeroCount = 0;
for (let i = 0; i < totalSplats; i++) {
const opacity = rgbaBytes[i * 4 + 3] / 255;
if (opacity > 0) {
nonZeroCount++;
}
}
// Create new PackedSplats with baked changes
const newPackedSplats = new PackedSplats({
maxSplats: nonZeroCount,
splatEncoding: ogSplats.splatEncoding,
});
// Build splat array from baked RGBA
let processedCount = 0;
for (let i = 0; i < totalSplats; i++) {
const rgbaOffset = i * 4;
const opacity = rgbaBytes[rgbaOffset + 3] / 255;
// Skip erased splats (zero opacity)
if (opacity === 0) {
continue;
}
// Unpack geometry from original packed array
const unpacked = unpackSplat(
ogSplats.packedArray,
i,
ogSplats.splatEncoding
);
// Replace color/opacity with baked painted values
unpacked.color.r = rgbaBytes[rgbaOffset + 0] / 255;
unpacked.color.g = rgbaBytes[rgbaOffset + 1] / 255;
unpacked.color.b = rgbaBytes[rgbaOffset + 2] / 255;
unpacked.opacity = opacity;
// Push to new PackedSplats
newPackedSplats.pushSplat(
unpacked.center,
unpacked.scales,
unpacked.quaternion,
unpacked.opacity,
unpacked.color
);
processedCount++;
}
console.log(`Processed ${processedCount} splats`);
// Now export the PackedSplats to SPZ
console.log("Writing splats to SPZ...");
const { fileBytes: spzBytes } = writeSpz(newPackedSplats, ioOptions.maxSh, ioOptions.fractionalBits);
console.log("Creating download...");
const blob = new Blob([spzBytes], { type: "application/octet-stream" });
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.href = url;
a.download = ioOptions.filename + "-painted.spz";
a.click();
URL.revokeObjectURL(url);
console.log("SPZ file with painted changes downloaded successfully:", ioOptions.filename + "-painted.spz");
} catch (error) {
console.error("Error exporting SPZ:", error);
console.error("Error stack:", error.stack);
}
},
};
const ioFolder = gui.addFolder("I/O");
ioFolder.add(ioOptions, "loadFile").name("Load Splats (SPZ/PLY)");
ioFolder.add(ioOptions, "saveToSpz").name("Save Splats (SPZ)");
ioFolder.open();
// Keyboard controls
window.addEventListener('keydown', (event) => {
if (event.key === '1') {
// Brush mode
PARAMETERS.brushEnabled.value = true;
PARAMETERS.eraseEnabled.value = false;
PARAMETERS.undoEnabled.value = false;
PARAMETERS.controlsEnabled = false;
controls.enabled = false;
showModeOverlay('Paint Mode');
} else if (event.key === '2') {
// Eraser mode
PARAMETERS.brushEnabled.value = false;
PARAMETERS.eraseEnabled.value = true;
PARAMETERS.undoEnabled.value = false;
PARAMETERS.controlsEnabled = false;
controls.enabled = false;
showModeOverlay('Erase Mode');
} else if (event.key === '3') {
// Undo mode
PARAMETERS.brushEnabled.value = false;
PARAMETERS.eraseEnabled.value = false;
PARAMETERS.undoEnabled.value = true;
PARAMETERS.controlsEnabled = false;
controls.enabled = false;
showModeOverlay('Undo Mode');
} else if (event.key === 'Escape') {
// View mode
PARAMETERS.brushEnabled.value = false;
PARAMETERS.eraseEnabled.value = false;
PARAMETERS.undoEnabled.value = false;
PARAMETERS.controlsEnabled = true;
controls.enabled = true;
showModeOverlay('View Mode');
} else if (event.key === '=' || event.key === '+') {
// Increase brush radius
const currentRadius = PARAMETERS.brushRadius.value;
const newRadius = Math.min(currentRadius + 0.01, MAX_BRUSH_RADIUS);
PARAMETERS.brushRadius.value = newRadius;
brushRadiusController.updateDisplay();
} else if (event.key === '-' || event.key === '_') {
// Decrease brush radius
const currentRadius = PARAMETERS.brushRadius.value;
const newRadius = Math.max(currentRadius - 0.01, MIN_BRUSH_RADIUS);
PARAMETERS.brushRadius.value = newRadius;
brushRadiusController.updateDisplay();
} else if (event.key === ']') {
// Increase brush depth
const currentDepth = PARAMETERS.brushDepth.value;
const newDepth = Math.min(currentDepth + 0.5, MAX_BRUSH_DEPTH);
PARAMETERS.brushDepth.value = newDepth;
brushDepthController.updateDisplay();
} else if (event.key === '[') {
// Decrease brush depth
const currentDepth = PARAMETERS.brushDepth.value;
const newDepth = Math.max(currentDepth - 0.5, MIN_BRUSH_DEPTH);
PARAMETERS.brushDepth.value = newDepth;
brushDepthController.updateDisplay();
}
});
console.log("Starting render loop");
// Animation loop
renderer.setAnimationLoop(() => {
if (PARAMETERS.controlsEnabled) {
controls.update(camera);
}
renderer.render(scene, camera);
});
</script>
</body>
</html>