将CALayer设置为SCNMaterial的漫反射内容 [英] Set CALayer as SCNMaterial's diffuse contents

问题描述

过去几天我一直在网上搜索无济于事。不幸的是，关于这个特定问题的苹果文档是模糊的，没有可用的示例代码（至少这是我发现的）。您可能会问的问题似乎是什么...

I've been searching all over the internet over the past couple of days to no avail. Unfortunately, the apple documentation about this specific issue is vague and no sample code is available (at least thats what I found out). What seems to be the issue you may ask...

我正在尝试将uiview的图层设置为用于渲染iPhone模型的材质的内容屏幕（是的，幻觉：P）。 iPhone的屏幕UV映射设置为0到1，因此在将纹理/图层映射到纹素上时没有问题。

I'm trying to set a uiview's layer as the contents of the material that is used to render an iPhone model's screen (Yep, trippy :P ). The iPhone's screen's UV mapping is set from 0 to 1 so that no issue persists in mapping the texture/layer onto the texels.

所以，不要让这个图层出现在iPhone上渲染，与左图相同，相反，我将其渲染到iPhone上，如右图像

So, instead of getting this layer to appear rendered on the iPhone, same as left image, Instead, I get this rendered onto the iPhone like right image

另请注意，当我设置断点并调试实际的iPhone节点和视图时在Xcode中，显示了一个完全不同的渲染，当我继续执行时，图层变为半固定：

Also note, that when I set a breakpoint and debug the actual iPhone node and view it in Xcode, a completely different render is shown and the layer gets half-fixed when I continue execution:

现在......我该如何解决这个问题???我尝试过使用漫反射内容变换矩阵，但没有任何修复。我也尝试将UIView调整为256x256（因为UV似乎是256x256，如blender所示 - 3d建模包），但这并没有解决任何问题。

Now then... HOW do I fix this issue??? I've tried playing with the diffuse's contents transform matrix but nothing gets fixed. I've also tried resizing the UIView to 256x256 (since the UV seems to be 256x256 as shown in blender - the 3d modelling package), but that doesn't fix anything.

以下是图层的代码：

UIView *screen = [[UIView alloc] initWithFrame:self.view.bounds];
screen.backgroundColor = [UIColor redColor];

UIView *temp = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screen.bounds.size.width, 60)];
temp.backgroundColor = [UIColor colorWithRed:0 green:(112.f/255.f) blue:(235.f/255.f) alpha:1];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectInset(temp.bounds, 40, 0)];
label.frame = CGRectOffset(label.frame, 40, 0);
label.textColor = [UIColor colorWithRed:0 green:(48.f/255.f) blue:(84.f/255.f) alpha:1];
label.text = @"Select Track";
label.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:30];
label.minimumScaleFactor = 0.001;
label.adjustsFontSizeToFitWidth = YES;
label.lineBreakMode = NSLineBreakByClipping;
[temp addSubview:label];

UIView *separator = [[UIView alloc] initWithFrame:CGRectMake(0, temp.bounds.size.height - 2, temp.bounds.size.width, 2)];
separator.backgroundColor = [UIColor colorWithRed:0 green:(48.f/255.f) blue:(84.f/255.f) alpha:1];
[temp addSubview:separator];
[screen addSubview:temp];
screen.layer.contentsGravity = kCAGravityCenter;

---

编辑

甚至更奇怪的是，如果我使用以下方法捕获视图的UIImage：

---

Edit
What's even weirder is that if I capture a UIImage of the view using:

- (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

并将其用作漫反射的内容......一切都很好吗？ ！由于图像的大小与uiview的大小完全相同，这真的很奇怪和令人沮丧...

and use that as the diffuse's content... everything works out perfectly fine?! It's really weird and frustrating since the image's size is exactly the same as the uiview's...

编辑2

我最后只使用视图图像作为纹理，这使得事物比我需要的更加静态。我不会将此作为答案，因为即使是在很长一段时间内，我仍然会等待正确解决这个问题。所以，如果你有一个答案并且这个主题已经打开了很长时间，请尽可能地碰到它。关于这一部分的文档非常糟糕。

I ended up just using an image of the view as the texture, which makes things much more static than I needed. I won't set this as the answer because I'll still be waiting for a correct fix to this issue even if it in a long time. So, if you have an answer and this topic has been opened for a long time, please bump it if you can. The documentation on this section is just so poor.

推荐答案

旧帖子上的新帖子，但这个日期，可以将UIView本身设置为SCNMaterialProperty（diffuse） contents 。直接从Apple的SceneKit工程部门传达了支持此功能的意图，尽管文档尚未更新以反映它。

New post on an old thread, but this day-in-age, it's possible to set the UIView itself as SCNMaterialProperty (diffuse) contents. Intention to support this feature is communicated directly from SceneKit engineering at Apple, though the documentation has not yet been updated to reflect it.

要绑定回原始帖子，请不要将UIView.layer设置为素材属性内容;而是将内容设置为UIView本身。

To tied back to the original post, do not set a UIView.layer as material property contents; instead set contents to the UIView itself.

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