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Apple Maps Guides

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How the depth-map is aligned to rgb image ?
I want to know are depth map and RGB image are perfectly aligned(do both have the same principle point)? If yes then how the depth- map is created. The depth map on iphone12 has 256x192 resolution as opposed to an RGB image (1920x1440). I am interested in exact pixel-wise depth. Is it possible to get the raw depth map of 1920x1440 resolution ? How is the depth-map is created at 256 x 192 resolution? Behind the scenes does the pipeline captures it at 1920 x1440 resolution and then resize it to 256x192? I have so many questions as there are no intrinsic, extrinsic, and calibration data given regarding the lidar. I would greatly appreciate it if someone can explain the steps from a computer-vision perspective. Many Thanks
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3.4k
Aug ’21
500 Internal Errors for map "shield" resources
I've noticed a load of 500 errors in my web inspector when viewing maps - it's trying to load /md/v1/shield? from the CDN. Interestingly, it only seems to happen on UK and Ireland maps. Other countries don't even seem to try accessing these resources; but if you look at a map for UK or Ireland, then you will see dozens of failed requests for these shield resources. I don't think it's anything to do with my implementation, as I can replicate it when looking at one of Apple's example maps and repositioning to view the UK. Does anyone know why these shield resources are only used for the UK? And why they're not working?
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854
Mar ’22
Stalling when panning/zooming map
I have an app that shows where busses are on their routes. Many times when panning around or trying to zoom in or out the app stalls. When location manager makes a call to didUpdateLocations, I reload the map with the possible change in the bus location. To get the change information I have to use NSURL to grab an xml file and parse it for bus route name, gps data, etc. Is this nsurl call blocking the app? Is there a way to put this call on a different thread so it is not blocking the pan/zoom actions on the map?Is there a better forum to ask this question?Thanks
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394
Aug ’15
Vector displacement map - settings to bake VDMs from Zbrush
Goal: Bake Vector Displacement in Zbrush Render in Scenekit/MetalProcess:Im using this Zbrush diagnostic file, to know proper settings for baking: http://docs.pixologic.com/user-guide/3d-modeling/exporting-your-model/vector-displacement-maps/Result:When rendered in Scenekit, I found no “perfect sphere” and you can see on images attached.Does anyone know correct settings for VDM in Scenekit?
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995
Mar ’19
Deleting memory mapped file
Does NSData dataWithContentsOfFile/initWithContentsOfFile with NSDataReadingMappedIfSafe always use mmap(2) which guards against the file being unlinked while it is mapped?I've created an NSData instance using - initWithContentsOfFile:options:error: with options = NSDataReadingMappedIfSafe, on a file in my sandbox Documents folder, deleted the file and continued to read from the NSData instance with no issues. But I can't tell for sure if this will always be the case. It seems that on iOS one should always be able to rely on mmap(2) behavior since the Documents folder is pretty much always there.Can someone from Apple comment? Thanks!
Topic: UI Frameworks SubTopic: UIKit Tags:
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439
Jan ’16
Reply to Unreal Engine 4.27 VR Game on VisionOS
Hi there. Apple Vision Pro is now (recently!) a valid build target for Unreal Engine - but you're going to want to use 5.4 from source and there are a few gotchas you'll have to mind. This quickstart guide should get you most of the way there - just remember to build 5.4 from source (which isn't documented in the guide): https://dev.epicgames.com/community/learning/tutorials/1JWr/unreal-engine-apple-vision-pro-quick-start-guide
Apr ’24
Reply to MapView remove polyline overlay, memory leak on IOS 14.2
After a bit more digging, I believe this only affects the simulator. It seems to occur anytime an overlay on a map is rendered. When the map position changes for any reason, e.g. scrolling the map, the leak gets bigger. Obviously this becomes a more significant issue if the map position changes automatically as in Henrivb's case and mine. You can see the leak grow just by rendering one overlay on a map, then moving the map around. I've filed feedback to Apple on this as well.
Apr ’21