How can I set the current viewing direction to the center of the image?

[miyurusagarage]

I want to set the current viewing direction to the center of the image using a button. How can I achieve this?

[mayakraft]

this is a good idea. i'm imagining a function that adds a rotation around the vertical poles to the offsetMatrix or something like it, perhaps called something like

-(void)setImageOffsetLongitude:(float)longitude

immediately, it can be hacked by adding a rotateY(amount) right before the sphere draw command

[mayakraft]

new property: cardinalOffset. updated in 3caaedc