tighter spheres geo bounding sphere

src/mol-geo/geometry/spheres/spheres.ts

@@ -175,7 +175,7 @@ export namespace Spheres {
 
         const counts = { drawCount: spheres.sphereCount * 2 * 3, vertexCount: spheres.sphereCount * 4, groupCount, instanceCount };
 
-        const padding = getMaxSize(size);
+        const padding = getMaxSize(size) * props.sizeFactor;
         const invariantBoundingSphere = Sphere3D.expand(Sphere3D(), spheres.boundingSphere, padding);
         const boundingSphere = calculateTransformBoundingSphere(invariantBoundingSphere, transform.aTransform.ref.value, instanceCount);
 
@@ -218,7 +218,7 @@ export namespace Spheres {
     }
 
     function updateBoundingSphere(values: SpheresValues, spheres: Spheres) {
-        const padding = getMaxSize(values);
+        const padding = getMaxSize(values) * values.uSizeFactor.ref.value;
         const invariantBoundingSphere = Sphere3D.expand(Sphere3D(), spheres.boundingSphere, padding);
         const boundingSphere = calculateTransformBoundingSphere(invariantBoundingSphere, values.aTransform.ref.value, values.instanceCount.ref.value);
 

src/mol-repr/structure/visual/util/element.ts

@@ -105,9 +105,7 @@ export function createElementSphereImpostor(ctx: VisualContext, unit: Unit, stru
     }
 
     const s = builder.getSpheres();
-
-    const sphere = Sphere3D.expand(Sphere3D(), unit.boundary.sphere, 1);
-    s.setBoundingSphere(sphere);
+    s.setBoundingSphere(unit.boundary.sphere);
 
     return s;
 }