Steve Gifford comments

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                                            Steve Gifford

[iOS] Displaying polygons with opacity

It's because the polygons are transparent. A lot of style sheets will use transparency to build an effect for each tile. Vector tile data tends to overlap for its own...

[IOS] Is't possible to create 3D object with GeoJSON?

Our exposure to GeoJSON predates the addition of 3rd coordinate. So yeah, it's being dropped. I guess you could shove it in there as an attribute, perhaps. That might be...

Cocoa Pod / Metal Verification

That would be a good idea.

The zoom position is always the center of the screen

What platform?

The zoom position is always the center of the screen

That is how it's implemented on Android, I'm afraid.

The zoom position is always the center of the screen

It is different on iOS. It's great that you have a colleague on iOS. Do you have a support contract for WhirlyGlobe-Maply?

The zoom position is always the center of the screen

Email me at [email protected] and I'll send the details.

Render-to-texture at low frame rate for low end devices

There are tradeoffs, such as more memory usage, but it's technically feasible. You've got other options too, like keeping the text as is and rendering the rest of the tile...