On Screen Direction and Position Indicator/Pointer for Unity

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Purpose is to simplify on screen direction indicator common in 3D games where an arrow head is pointing toward a game object, or a waypoint or an enemy or an objective.

Setup

Setting up this system is pretty straight forward.

• There are a total of two script OnScreenPointerController and OnScreenPointerObject.

• OnScreenPointerController is a singleton. This script mainly contains enviroment info needed for this plugin.

• OnScreenPointerControllerneeds two references. Camera related to player and ui RectTransform .

• RectTransform will contain all the pointers. Purpose is to have one place for managing all pointers.

• OnScreenPointerController has Camera reference. If it is null, plugin will try to find Main Camera and use it.

• OnScreenPointerObjectis attached is to target game object whose position we intend to track in realtime during our gameplay session.

  • offset_local is normalized screen size in x andydirection. During final result calculation, offset_local.x is multiplied with screenWidthand result is the padding from screen edges. (same process repeats for yandscreenHeight).

  • MoveInCicle is use to place pointer at a fix distance from screen center. Smaller dimension is choosen from screen size and pointer is placed along that angle. Distance from center is controlled by circleSizeNormalized. Example: pointer is placed at a mid-way from screen center to screen edge when circleSizeNormalizedis 0.5

  • inScreenSprite: Pointer Image when object is with in screen area whether visible or not.

  • outScreenSprite: Pointer Image when object is not in screen. Object may be infront of player but not in periphery of camera view. Object may be in back of player/camera.

  • uiImagePrefab: Prefab configured for inScreenSprite/outScreenSprite. Can be a complex assembly of views chained togather. However, current implementation has the assumption that parent Prefab will have a Image component.