无法显示缓存目录中的 3d 文件

Question

你能帮我确定这里的问题吗？

我似乎无法显示缓存目录中的 3d 文件。我遇到此错误 SceneKit IO: 错误，此平台不支持 COLLADA 文件。

我保存在缓存目录中的zip 文件包含.dae 文件和texturee 的.png。使用 Scene Kit，您可以：

导入 COLLADA 3D 对象并构建由相机、灯光和网格组成的场景。 https://developer.apple.com/library/mac/documentation/3DDrawing/Conceptual/SceneKit_PG/Introduction/Introduction.html

谢谢。

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
    NSURL *url = [NSURL URLWithString:@"my url"
    NSData *data = [NSData dataWithContentsOfURL:url options:0 error:&error];

    if(!error)
    {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
        NSString *path = [paths objectAtIndex:0];
        NSString *zipPath = [path stringByAppendingPathComponent:@"zipfile.zip"];

        [data writeToFile:zipPath options:0 error:&error];

        if(!error)
        {
            ZipArchive *za = [[ZipArchive alloc] init];
            if ([za UnzipOpenFile: zipPath]) {
                BOOL ret = [za UnzipFileTo: path overWrite: YES];
                if (NO == ret){} [za UnzipCloseFile];

                NSString *floorFilePath = [path stringByAppendingPathComponent:@"house1.dae"];
                NSURL *floorPathURL = [NSURL fileURLWithPath:floorFilePath];
                dispatch_async(dispatch_get_main_queue(), ^{

                    SCNView *sceneView = (SCNView *)self.view;
                    sceneView = (SCNView *)self.view;
                    sceneView.allowsCameraControl = YES;
                    sceneView.autoenablesDefaultLighting = YES;
                    sceneView.backgroundColor = [UIColor whiteColor];
                    sceneView.scene = [SCNScene sceneWithURL:floorPathURL options:nil error:nil];
                });
            }
        }
        else
        {
            NSLog(@"Error saving file %@",error);
        }
    }
    else
    {
        NSLog(@"Error downloading zip file: %@", error);
    }

});

Answer 1

SCNSceneSource Class Reference有一个table:

Format                          Filename Extension    Supported in

Collada Digital Asset Exchange  .dae                  OS X v10.8 and later

Alembic                         .abc                  OS X v10.10 and later

SceneKit compressed scene       .dae or .abc          OS X v10.10 and later
                                                      iOS 8.0 and later

SceneKit archive                .scn                  OS X v10.10 and later
                                                      iOS 8.0 and later

您确定您的 .dae 文件是“SceneKit 压缩场景”吗？显然，iOS 只支持从 .dae 文件加载压缩场景。 Xcode 在编译您的应用程序时应该会自动将您的 Collada .dae 转换为压缩场景（具有相同的扩展名）。如果您从应用程序包外部加载文件（例如，在运行时从 URL），除非您已采取措施将其转换到其他地方，否则它不会是 SceneKit 压缩场景。

我在 this answer 上找到了以下评论：

To convert the dae file to a file that can be read by SCNScene(named:... you can convert the file manually by using the following commandline in terminal: /Applications/Xcode.app/Contents/Developer/usr/bin/scntool --convert InFile.dae --format c3d --output OutFile.dae --force-y-up --force-interleaved --look-for-pvrtc-image (Of course, replace InFile.dae and OutFile.dae by your own filenames) Sorry, no real formatting possible in comments. – Marcus Feb 2 at 18:23

我不知道所有这些标志是否适合您使用。根据 this web site，还有一个名为 copySceneKitAssets 的命令行程序（在同一个 Xcode 子目录中）可以转换 .scnassets 目录，所以也许这就是您想要使用的。

无法显示缓存目录中的 3d 文件

Can't display 3d file from cache directory

xcode

objective-c

collada

ios

scenekit