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If I create an object: for example a sphere of a certain material can I know its weight? Can I know the specific weight of a material among those I can choose in Reality Composer? Thank you to those who can help me.

I wrote this code in swift Playgrounds import SwiftUI import PlaygroundSupport struct ContentView: View {     var body: some View {         Home()     } } struct ContentView_Previews: PreviewProvider {     static var previews: some View {         ContentView()         }     }      struct Home : View {     var body: some View {         VStack {             LazyVGrid(columns: Array(repeating: GridItem(.flexible(), spacing: 15), count: 3), spacing: 15) {                 ForEach(0..<9,id:\.self){index in                         Color.white                     }                 }             }         }     } PlaygroundPage.current.setLiveView(ContentView()) and at lines witch contains LazyVGrid there is an error? Is it possible having LazyVGrid in Playgrounds?

I wanted to try to open my feed for a playgroiunds subscription. I followed instructions in the video of WWWDC18. I used GitHub as a repository. My site appears at address https: // giobus.github.io. But if you follow the 'subscribe' link it will not work. Also if you insert directly the subscription link. The error is "Verify the url and retry", I checked everything, everything seems fine, but obviously I'm wrong. If I use the direct link ( giobus.github.io/ordiniamo/ordiniamo.playgroundbook.zip) on github to download the playground it works !!!! Also the .json file looks fine, I checked it with file in the video WWWDC18 and I can not see any difference. I do not understand why ... any help!? This my .json file, I wrote it with "Sublime text" {"title": "Giobus Playgrounds","publisherName": "Giovanna Busconi","feedIdentifier" : "io.github.giobus","contactURL" : "mailto:giovanna.busconi@gmail.com","formatversion": "1.1","documents": [{"title" : "Ordiniamo","overviewSubtitle" : "Ragionanado sull'ordinamento di vettori","detailSubtitle": "Ordinamento Bubblesort e Per scambio","description": "Playground realizzato durante un corso di formazione docenti","contentIdentifier": "io.github.giobus.ordiniamo","contentVersion": "1.0","url": "https://giobus.github.io/ordiniamo/ordiniamo.playgroundbook.zip","publishedDate": "2018-07-09T09:00:00+07:00","lastUpdateDate" : "2018-07-10T12:00:00+07:00","thumbnailURL": "https://giobus.github.io/ordiniamo/thumbnail.png","bannerImageURL" : "https://giobus.github.io/ordiniamo/bannerImage.png","additionalInformation" : [{"name": "Pensato per","value": "scuola secondaria secondo grado"}],"previewImageURLs" : [ ]}]}