GM_3DSetChangeViewCallback

Marius Lazar

September 02, 2026 13:40 Updated

Global Mapper SDK

Sets the callback function to be called when a button is pressed (either a pan or zoom button) in the 3D view that would typically result in a new set of data to be displayed in the 3D window.

Syntax

C++

Copy

void __stdcall GM_3DSetChangeViewCallback
(
GM_3DChangeViewCallbackFunc aCallbackFunc,
void*                       aUserData
);

Remarks

Provide this callback if you want to keep your main view in sync with the 3D view, like in the Global Mapper application. If you do not provide a callback, the default behavior is to just update the data displayed in the 3D view independent of any other view.