WebGPU is not enabled or supported in your browser. Try updating Chrome.
);
}
return (
{/* Absolute Performance Stats Overlay */}
ðŠ Lem3D Diagnostics
FPS: {metrics.fps}
Draw Calls: {metrics.drawCalls}
Instances: {metrics.totalInstances}
);
}
```
---
### Example 2: Interactive Keyboard Character Controller
Demonstrates utilizing `engine.keys` inside loop updates to handle WASD drone navigation.
```typescript
import { WebGPUEngine, WebGPUMesh, createQuadcopterPrefab } from 'lem3d-webgpu';
import { mat4, vec3, quat } from 'gl-matrix';
export async function initDroneController(canvas: HTMLCanvasElement) {
const engine = new WebGPUEngine({ canvas, debug: true });
const isOk = await engine.init();
if (!isOk) return;
// Set up the quadcopter mesh
const droneGeom = createQuadcopterPrefab();
const droneMesh = new WebGPUMesh(engine.device!, droneGeom, 1);
engine.meshes = [droneMesh];
// Starting position coordinates
const position = vec3.fromValues(0, 2.0, 0);
let rotationY = 0.0;
const speed = 8.0; // units per second
const tick = () => {
const dt = engine.deltaTime;
const direction = vec3.create();
// Check keyboard input states
if (engine.keys['w'] || engine.keys['arrowup']) {
direction[2] += 1.0;
}
if (engine.keys['s'] || engine.keys['arrowdown']) {
direction[2] -= 1.0;
}
if (engine.keys['a'] || engine.keys['arrowleft']) {
rotationY += 2.0 * dt; // Rotate counter-clockwise
}
if (engine.keys['d'] || engine.keys['arrowright']) {
rotationY -= 2.0 * dt; // Rotate clockwise
}
if (engine.keys[' '] || engine.keys['q']) {
position[1] += speed * 0.5 * dt; // Gain altitude
}
if (engine.keys['shift'] || engine.keys['e']) {
position[1] = Math.max(0.1, position[1] - speed * 0.5 * dt); // Drop altitude
}
// Apply rotation matrix transforms to move relative to heading
if (vec3.length(direction) > 0) {
vec3.normalize(direction, direction);
const moveRotation = quat.create();
quat.setAxisAngle(moveRotation, vec3.fromValues(0, 1, 0), rotationY);
vec3.transformQuat(direction, direction, moveRotation);
vec3.scaleAndAdd(position, position, direction, speed * dt);
}
// Compose final transformation matrix
const transform = mat4.create();
mat4.translate(transform, transform, position);
mat4.rotateY(transform, transform, rotationY);
// Apply rotation wobble animation based on moving state
if (vec3.length(direction) > 0) {
mat4.rotateX(transform, transform, 0.15); // Slight tilt forward
}
// Push coordinates to the drone mesh buffer
droneMesh.updateInstances([{
transform,
color: new Float32Array([0.2, 0.8, 1.0]) // Cyber Blue hull tint
}]);
// Position camera to follow behind the moving drone
engine.camera.updateFollowTarget(position);
};
const render = () => {
tick();
if (engine.isRunning) {
requestAnimationFrame(render);
}
};
engine.start();
requestAnimationFrame(render);
}
```
---
### Example 3: Dynamic Procedural Joint/Skeletal Rig Setup
Demonstrates dynamically building a jointed segment spine/tail chain that wiggles procedurally.
```typescript
import { WebGPUEngine, WebGPUMesh, createSphereGeometry, createCylinderGeometry } from 'lem3d-webgpu';
import { mat4, vec3, quat } from 'gl-matrix';
export async function initSkeletalSpine(canvas: HTMLCanvasElement) {
const engine = new WebGPUEngine({ canvas });
await engine.init();
// Create joint node geometries
const jointGeom = createSphereGeometry(0.35, 12, 12);
const boneGeom = createCylinderGeometry(0.08, 0.08, 1.0, 8);
const jointMesh = new WebGPUMesh(engine.device!, jointGeom, 50);
const boneMesh = new WebGPUMesh(engine.device!, boneGeom, 50);
engine.meshes = [jointMesh, boneMesh];
let time = 0;
const numSegments = 10;
const loop = () => {
time += engine.deltaTime;
const jointInstances = [];
const boneInstances = [];
// Track sequential joint positions
const jointPositions: vec3[] = [];
let currentPos = vec3.fromValues(0, 1.0, 0);
jointPositions.push(vec3.clone(currentPos));
let currentAngle = 0;
for (let i = 1; i < numSegments; i++) {
// Calculate a progressive wave offset for each segment
const waveAngle = Math.sin(time * 3.0 - i * 0.6) * 0.35;
currentAngle += waveAngle;
const nextPos = vec3.fromValues(
currentPos[0] + Math.sin(currentAngle) * 1.5,
currentPos[1],
currentPos[2] + Math.cos(currentAngle) * 1.5
);
jointPositions.push(vec3.clone(nextPos));
currentPos = nextPos;
}
// 1. Position and render Joint Node Spheres
for (let i = 0; i < jointPositions.length; i++) {
const transform = mat4.create();
mat4.fromTranslation(transform, jointPositions[i]);
jointInstances.push({
transform,
color: new Float32Array([1.0, 0.3 + (i / numSegments) * 0.7, 0.2])
});
}
// 2. Position and interpolate Bone connecting segments
for (let i = 0; i < jointPositions.length - 1; i++) {
const parent = jointPositions[i];
const child = jointPositions[i + 1];
const midPoint = vec3.create();
vec3.add(midPoint, parent, child);
vec3.scale(midPoint, midPoint, 0.5);
const direction = vec3.create();
vec3.sub(direction, child, parent);
const distance = vec3.length(direction);
vec3.normalize(direction, direction);
// Align Cylinder orientation with the connection vector
const alignRotation = quat.create();
const upVector = vec3.fromValues(0, 1, 0);
quat.rotationTo(alignRotation, upVector, direction);
const transform = mat4.create();
mat4.fromRotationTranslationScale(
transform,
alignRotation,
midPoint,
vec3.fromValues(1.0, distance, 1.0) // Stretch along the cylinder's height axis
);
boneInstances.push({
transform,
color: new Float32Array([0.8, 0.8, 0.9])
});
}
jointMesh.updateInstances(jointInstances);
boneMesh.updateInstances(boneInstances);
// Track the middle joint of the spine
engine.camera.updateFollowTarget(jointPositions[Math.floor(numSegments / 2)]);
if (engine.isRunning) {
requestAnimationFrame(loop);
}
};
engine.start();
requestAnimationFrame(loop);
}
```
---
### Example 4: Dynamic Noise Grid Shader Compile
Demonstrates dynamically compiling and injecting a custom WGSL vertex displacement shader to create animated landscape deformation.
```typescript
import { WebGPUEngine, WebGPUMesh, createGridGeometry } from 'lem3d-webgpu';
export async function setupDynamicNoiseShader(canvas: HTMLCanvasElement) {
const engine = new WebGPUEngine({ canvas });
await engine.init();
// Create high-density grid geometry (60x60 subdivisions)
const gridGeom = createGridGeometry(40.0, 40.0, 60, 60);
const gridMesh = new WebGPUMesh(engine.device!, gridGeom, 1);
engine.meshes = [gridMesh];
// Set grid to origin coordinates
gridMesh.updateInstances([{
transform: new Float32Array(16), // Identity matrix (filled below dynamically)
color: new Float32Array([0.0, 1.0, 0.5])
}]);
// Custom WGSL shader inject code containing sinus-noise displacement calculations
const vertexShaderWithNoise = `
struct CameraUniforms {
viewProj: mat4x4