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Tweak multiple viewports example #2

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Merged
dmarcos merged 2 commits into from
May 26, 2025
Merged

Tweak multiple viewports example #2

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4f83574
tweak multiple viewports example
feiss May 25, 2025
e0123e5
fix async
feiss May 25, 2025
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4 changes: 4 additions & 0 deletions examples/assets.json
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Original file line number Diff line number Diff line change
Expand Up @@ -86,5 +86,9 @@
"cat.spz": {
"url": "https://forge-gfx.github.io/assets/splats/cat.spz",
"directory": "splats"
},
"arrow.glb": {
"url": "https://forge-gfx.github.io/assets/models/arrow.glb",
"directory": "models"
}
}
83 changes: 63 additions & 20 deletions examples/multiple-viewpoints/index.html
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Original file line number Diff line number Diff line change
@@ -1,10 +1,34 @@
<!DOCTYPE html>

<head>
<meta charset="utf-8">
<title>Forge • Multiple Viewpoints</title>
<style> body {margin: 0;} </style>
<style>
body {
margin: 0;
background-color: black;
}

header {
margin: 0 auto;
padding: 10px 0;
min-width: 400px;
width: 50%;
}

input {
width: 100%;
padding: 10px 0;
}
</style>
</head>

<body>
<header>
<input type="range" min="-100" max="100" id="camera1">
<input type="range" min="-100" max="100" id="camera2">
</header>

<script type="importmap">
{
"imports": {
Expand All @@ -16,25 +40,27 @@
<script type="module">
import * as THREE from "three";
import { ForgeRenderer, ForgeViewpoint, SplatMesh } from "@forge-gfx/forge";
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
import { getAssetFileURL } from "/examples/js/get-asset-url.js";

const scene = new THREE.Scene();
scene.background = new THREE.Color(0x000000);
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
const header_height = document.querySelector('header').getBoundingClientRect().height;
renderer.setSize(window.innerWidth, window.innerHeight - header_height);
document.body.appendChild(renderer.domElement)

// Explicitly create a ForgeRenderer in the scene to spawn new viewpoints
const forge = new ForgeRenderer({ renderer });

const splatURL = await getAssetFileURL("butterfly.spz");
const butterfly = new SplatMesh({ url: splatURL});
const butterfly = new SplatMesh({ url: splatURL });
butterfly.quaternion.set(1, 0, 0, 0);
butterfly.position.set(0, 0, -1);
butterfly.position.set(0, 0, -3);
scene.add(butterfly);

function createViewpoint(origin, screenPos) {
async function createViewpoint(origin, screenPos, index) {
// Create a textured rectangle at the near plane to show the viewpoint
const width = 320;
const height = 240;
Expand All @@ -49,15 +75,30 @@
viewCamera.position.copy(origin);
viewCamera.lookAt(butterfly.position);

// Create a cone to show the viewpoint camera
const cone = new THREE.Mesh(
new THREE.ConeGeometry(0.1, 0.1, 32),
new THREE.MeshNormalMaterial(),
);
cone.position.copy(viewCamera.position);
cone.quaternion.copy(viewCamera.quaternion);
cone.rotateX(Math.PI / 2);
scene.add(cone);
// Load arrow object to show where each camera is
const arrowURL = await getAssetFileURL("arrow.glb");
new GLTFLoader().load(arrowURL, gltf => {
// Different material for each camera
const arrowMaterial = new THREE.MeshMatcapMaterial({
matcap: [
new THREE.TextureLoader().load("https://raw.githubusercontent.com/nidorx/matcaps/master/128/1A2461_3D70DB_2C3C8F_2C6CAC-128px.png"),
new THREE.TextureLoader().load("https://raw.githubusercontent.com/nidorx/matcaps/master/128/9D282A_38191D_DFC6CD_D6495A-128px.png")
][index]
});

const arrow = gltf.scene.children[0];
arrow.material = arrowMaterial;
arrow.position.copy(viewCamera.position);
arrow.lookAt(butterfly.position);
scene.add(arrow);

// Connect slider to both camera and arrow
document.getElementById("camera" + (index + 1)).oninput = ev => {
viewCamera.position.x = (ev.target.value / 100);
arrow.position.x = viewCamera.position.x;
arrow.lookAt(butterfly.position);
};
});

// Spawn a new viewpoint that auto-updates its sort order, double
// buffered in case the texture is used recursively in the scene
Expand All @@ -70,25 +111,27 @@
screen.material.map = texture;
},
});

return viewpoint;
}

const viewpoints = [
createViewpoint(new THREE.Vector3(0, 0.5, -1), new THREE.Vector2(-0.5, 0.5)),
createViewpoint(new THREE.Vector3(0.5, -0.5, -1), new THREE.Vector2(-0.5, -0.5)),
await createViewpoint(new THREE.Vector3(0, 1.5, -3), new THREE.Vector2(-0.5, 0.5), 0),
await createViewpoint(new THREE.Vector3(0.5, -1, -3), new THREE.Vector2(0.5, -0.5), 1),
];

renderer.setAnimationLoop(function animate(time) {
scene.background.set(0x000000);
renderer.render(scene, camera);
butterfly.rotation.y += 0.01;

// Adjust the background for visibility and render the viewpoints
scene.background.set(0x000040);
for (const viewpoint of viewpoints) {
viewpoint.renderTarget({ scene, camera: viewpoint.camera });
// Render each viewpoint (with a different background each)
for (let i = 0; i < viewpoints.length; i++) {
scene.background.set([0x202040, 0x302020][i]);
viewpoints[i].renderTarget({ scene, camera: viewpoints[i].camera });
}
});
</script>
</body>

</html>