Splat updates

src/splat/splat-data.ts

@@ -140,15 +140,19 @@ class SplatData {
         const sy = this.getProp('scale_1');
         const sz = this.getProp('scale_2');
 
+        const opacity = this.getProp('opacity');
+
         const splat = {
             x: 0, y: 0, z: 0, rx: 0, ry: 0, rz: 0, rw: 0, sx: 0, sy: 0, sz: 0
         };
 
-        // initialize aabb
-        result.center.set(x[0], y[0], z[0]);
-        result.halfExtents.set(0, 0, 0);
+        let first = true;
 
         for (let i = 0; i < this.numSplats; ++i) {
+            if (opacity[i] === -1000) {
+                continue;
+            }
+
             splat.x = x[i];
             splat.y = y[i];
             splat.z = z[i];
@@ -160,9 +164,16 @@ class SplatData {
             splat.sy = Math.exp(sy[i]);
             splat.sz = Math.exp(sz[i]);
 
-            calcSplatAabb(aabb2, splat);
-            result.add(aabb2);
+            if (first) {
+                first = false;
+                calcSplatAabb(result, splat);
+            } else {
+                calcSplatAabb(aabb2, splat);
+                result.add(aabb2);
+            }
         }
+
+        return !first;
     }
 
     renderWireframeBounds(app: AppBase, worldMat: Mat4) {
@@ -215,14 +226,15 @@ class SplatData {
         const x = this.getProp('x');
         const y = this.getProp('y');
         const z = this.getProp('z');
+        const opacity = this.getProp('opacity');
 
         const sx = this.getProp('scale_0');
         const sy = this.getProp('scale_1');
         const sz = this.getProp('scale_2');
 
         let sum = 0;
         for (let i = 0; i < this.numSplats; ++i) {
-            const weight = 1.0 / (1.0 + Math.exp(Math.max(sx[i], sy[i], sz[i])));
+            const weight = opacity[i] / (1.0 + Math.exp(Math.max(sx[i], sy[i], sz[i])));
             result.x += x[i] * weight;
             result.y += y[i] * weight;
             result.z += z[i] * weight;

src/splat/splat-resource.ts

@@ -144,6 +144,18 @@ class SplatResource extends ContainerResource {
         return result;
     }
 
+    updateFocalPoint() {
+        this.splatData.calcFocalPoint(this.focalPoint);
+    }
+
+    updateAabb() {
+        this.splatData.calcAabb(this.customAabb);
+
+        this.instances.forEach((instance) => {
+            instance.entity.render.customAabb = this.customAabb;
+        });
+    }
+
     getFocalPoint(): Vec3 {
         const instance = this.instances[0];
         return instance?.entity.getWorldTransform().transformPoint(this.focalPoint);