Question

不确定如何使用从Web加载的图像作为GLKit天空盒中的资源（如旧的apple / google maps streetview）有两种方法可以使用GLKTextureLoader加载立方体贴图： cubeMapWithContentsOfFile 和 cubeMapWithContentsOfUrl

如果我在本地抓取图像，它可以正常工作：

NSString *path = [[NSBundle mainBundle] pathForResource:@"pano" ofType:@"jpg"];
GLKTextureInfo *skyboxCubemap =  [GLKTextureLoader cubeMapWithContentsOfFile:imgPath options:options error:&error];

那么有没有办法从网上加载的图像中获取路径并在此处使用它？

Answer 1

我最终从网上加载图像：

- (void) cacheImage: (NSURL *) ImageURL : (NSString *)imageName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *dir = [paths objectAtIndex: 0];
    NSString *file = [docDir stringByAppendingPathComponent: imageName];

    if(![[NSFileManager defaultManager] fileExistsAtPath: file])
    {
        NSData *data = [[NSData alloc] initWithContentsOfURL: ImageURL];
        UIImage *image = [[UIImage alloc] initWithData: data];
        [UIImageJPEGRepresentation(image, 100) writeToFile: docFile atomically: YES];
    }
}

通过以下方式缓存并返回文件URL：

- (NSString *) getCachedImage : (NSString *)imageName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains
    (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* cachedPath = [documentsDirectory stringByAppendingPathComponent:imageName];
    NSString *path;
    if([[NSFileManager defaultManager] fileExistsAtPath: cachedPath])
    {
        path = cachedPath;
    }
    return path;
}

并通过

加载文件

NSString *cached = [self getCachedImage:@"cacheKey"];
self.skyboxCubemap =  [GLKTextureLoader cubeMapWithContentsOfFile:cached options:options error:&error];

如何使用GLKTextureLoader从Web URL加载立方体贴图

1 个答案: