Implement 3D rendering in Graph3dSurfaceView#5
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The GLSurfaceView only cleared the screen — it never built a mesh, configured a frustum, or wired up touch rotation, so 2-variable functions showed nothing. Reuse the existing Graph3d mesh class and adapt the deprecated Graph3dView pipeline (perspective frustum, accumulated rotation matrix, snake line-strip draw) into the modern GLSurfaceView lifecycle. Touch input rotates the surface with inertia, pinch gestures zoom, and screenshots are captured on the GL thread via queueEvent.
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The GLSurfaceView only cleared the screen — it never built a mesh, configured a frustum, or wired up touch rotation, so 2-variable functions showed nothing. Reuse the existing Graph3d mesh class and adapt the deprecated Graph3dView pipeline (perspective frustum, accumulated rotation matrix, snake line-strip draw) into the modern GLSurfaceView lifecycle. Touch input rotates the surface with inertia, pinch gestures zoom, and screenshots are captured on the GL thread via queueEvent.