This sample shows how to filter and query a mesh SceneLayer. Filtering is done by setting an SQL query in the definitionExpression of the layer:
sceneLayer.definitionExpression = "BUILDINGNAME = 'Main Building'";
The view will update immediately after setting the definitionExpression property.
When querying the layer you can build a new query from scratch or you can create one that already satisfies the set definitionExpression. By using createQuery() the result will only return filtered features.
const query = sceneLayer.createQuery();
query.outFields = ["SPACETYPE"];
sceneLayer.queryFeatures(query).then((result) => {
console.log(result.features); // print the features to the console
});