CedricGuillemet

addBodiesPG.js
https://playground.babylonjs.com/?snapshot=refs/pull/13757/merge#RQIZD3#1

aggregateReuseShapePG
https://playground.babylonjs.com/?snapshot=refs/pull/13757/merge#4Y813L#1

blockTowerPG
https://playground.babylonjs.com/?snapshot=refs/pull/13757/merge#FWTRDD#3

centerOfMassPG

CedricGuillemet

# useful commands
# list already installed Android packages : $ANDROID_HOME/tools/bin/sdkmanager --list
# stop activity : adb shell am force-stop com.android.babylonnative.playground
# test activity is running : adb shell pidof com.android.babylonnative.playground
#$ANDROID_HOME/platform-tools/adb devices
# adb shell pm grant com.android.babylonnative.playground android.permission.CAMERA
# rotate screen
# adb shell content insert --uri content://settings/system --bind name:s:accelerometer_rotation --bind value:i:0
# adb shell content insert --uri content://settings/system --bind name:s:user_rotation --bind value:i:1
  - bash: |

CedricGuillemet

var wireframe = false;
var turntable = false;
var logfps = true;
var ibl = false;
var rtt = false;
var vr = false;
var ar = false;
var xrHitTest = false;
var xrFeaturePoints = false;
var text = false;

CedricGuillemet

    trail.data.shift(); trail.data.shift(); trail.data.shift(); trail.data.shift();
    trail.data.push(newPos.x, newPos.y, newPos.z, 0.);
    if (!trail.texture) {
        trail.texture = BABYLON.RawTexture.CreateRGBATexture(new Float32Array(trail.data), 1, trail.data.length / 4, scene, false, false, BABYLON.Texture.LINEAR_LINEAR, BABYLON.Engine.TEXTURETYPE_FLOAT);
        trail.trackSampler0Block.texture = trail.texture;
        trail.trackSampler1Block.texture = trail.texture;
    } else {
        trail.texture.update(new Float32Array(trail.data));
    }

CedricGuillemet

    var trailMesh = BABYLON.MeshBuilder.CreateGround("trail", {width: 0.1, height: 0.010, subdivisionsY:256}, scene);
    trailMesh.setBoundingInfo(new BABYLON.BoundingInfo(new BABYLON.Vector3(-1000,-1000,-1000), new BABYLON.Vector3(1000,1000,1000)));
    trailMaterial.backFaceCulling = true;
    trailMesh.material = trailMaterial;
    var trackSampler0Block = trailMaterial.getBlockByPredicate((b) => b.name === "tailSampler0");
    var trackSampler1Block = trailMaterial.getBlockByPredicate((b) => b.name === "tailSampler1");
    
    var data = new Array(trailLength * 4);
    for (let i = 0; i < trailLength; i++)
    {

CedricGuillemet

The *recommended* precompiled SDK download is 1.39.6 (967836071d96d9b7894e492382f5fcb96423fc07).

To install/activate it, use one of:
         latest                  [default (llvm) backend]
         latest-fastcomp         [legacy (fastcomp) backend]

Those are equivalent to installing/activating the following:
         1.39.6
         1.39.6-fastcomp

CedricGuillemet

        arcana::make_task(arcana::threadpool_scheduler, m_cancelSource,
            [this, dataSpan, generateMips, invertY, onErrorRef = Napi::Persistent(onError)]() {
                try
                {
                    bimg::ImageContainer* image = bimg::imageParse(&m_allocator, dataSpan.data(), static_cast<uint32_t>(dataSpan.size()));
                    // todo: bimg::imageParse will return nullptr when trying to load a texture with an url that is not a valid texture
                    // Like a 404 html page.
                    if (invertY)
                    {
                        FlipY(image);

CedricGuillemet

float distanceFromSurface = 0.0;
float step = 0.03;
vec3 previousPosition = vPosition;
float previousDistance = 0.;

for (int i = 0; i < 100; i++) {
    vec3 currentPosition = vPosition + distanceFromSurface * rayDir;
    float distance = sphereDistance(currentPosition, sphereCenter, 1.0);
    if (distance < 0.) {
        vec3 hitPosition = mix(previousPosition, currentPosition, previousDistance / (previousDistance - distance));

CedricGuillemet

if (sphereDistance(currentPosition, sphereCenter, 1.0) < 0.) {
    vec3 normal = (currentPosition - sphereCenter);
    float dotLight = dot(normal, ligthDirection) * 0.5 + 0.5;
    float noiseTexture = simplex3d(currentPosition * 4.0) * 0.5 + 0.5;
    gl_FragColor = vec4(vec3(1.0, 0.5, 0.2) * dotLight * noiseTexture, 1.0);
    return;
}

CedricGuillemet

if (sphereDistance(currentPosition, sphereCenter, 1.0) < 0.) {
    vec3 normal = (currentPosition - sphereCenter);
    float dotLight = dot(normal, ligthDirection) * 0.5 + 0.5;
    gl_FragColor = vec4(vec3(1.0, 0.5, 0.2) * dotLight, 1.0);
    return;
}