unitycoder

// calculate distance between two LAT LON values
// Note: In this formula, the latitudes and longitudes are expressed in radians. 6371 is radius of the earth in km
// SOURCE: codinggame.com 

var earthRadius = 6371;

var x = (lonB-lonA)*Math.cos((latA+latB)/2);
var y = (latB-latA);
var d = Math.sqrt(x*x+y*y)*earthRadius;

unitycoder

public LayerMask yourLayer = 1 << 10; // 10
  
gameObject.layer = (int)Mathf.Log(yourLayer.value, 2);

unitycoder

// https://forum.unity.com/threads/overlay-canvas-and-world-space-coordinates.291108/#post-9627593
// translating between overlay canvas and world space coordinates
uiObject.transform.position = RectTransformUtility.WorldToScreenPoint(Camera.main, worldObject.transform.TransformPoint(Vector3.zero));

--------


// http://answers.unity3d.com/questions/799616/unity-46-beta-19-how-to-convert-from-world-space-t.html

 //this is your object that you want to have the UI element hovering over

unitycoder

Vector3[] corners = new Vector3[4];
rectTransform1.GetWorldCorners(corners);
Rect rec = new Rect(corners[0].x,corners[0].y,corners[2].x-corners[0].x,corners[2].y-corners[0].y);

rectTransform2.GetWorldCorners(corners);
Rect rec2 = new Rect(corners[0].x, corners[0].y,corners[2].x-corners[0].x,corners[2].y-corners[0].y);

if (rectTransform1.Overlaps(rectTransform2))
{
    Debug.Log("rectTransform1 is Overlapping rectTransform2!");

unitycoder

// Scene setup:
// CanvasCamera (canvasCam) with ScreenSpace-Camera UI canvas & elements (in different position from main camera)
// MainCamera (mainCam)
// UI image (obj) inside the CanvasCamera canvas

var originalScreenPos = canvasCam.WorldToScreenPoint(obj.position);
var worldPosInMainCamera = mainCam.ScreenToWorldPoint(p1);
var rayDirection = (worldPosInMainCamera-mainCam.transform.position);
Debug.DrawRay(mainCam.transform.position, rayDirection * 999, Color.red);

unitycoder

X55b4f2f6990d5ca7a8X

unitycoder

using UnityEngine;
using System.Collections;

// attach this scrip to the camera you want to draw your rt from elsewhere
public class DrawRT : MonoBehaviour
{
    public RenderTexture rt; // render to this rt from another camera

    Camera cam;
    Rect cameraViewRect;

unitycoder

http://answers.unity3d.com/questions/997174/unity-ui-rendertexture-broken-since-501p4.html *lower camera depth for rendertexture cam
http://forum.unity3d.com/threads/ui-flicker-screen-space-overlay-render-texture.375712/#post-2448703 *render camera manually in code
http://answers.unity3d.com/questions/1092350/unity-5-gui-fllickering-artefacts-on-android.html *fixed in unity version 5.3?
http://forum.unity3d.com/threads/5-3-elements-in-the-ui-flicker-between-different-sprites.373098/page-4#post-2486347 *patch version

unitycoder

// blog post: https://unitycoder.com/blog/2016/03/01/latitude-longitude-position-on-3d-sphere-v2/

using UnityEngine;

public class LatLong : MonoBehaviour
{

    public Transform marker; // marker object
    public float radius = 5; // globe ball radius (unity units)
    public float latitude = 51.5072f; // lat

unitycoder

// http://forum.unity3d.com/threads/create-2d-collider-based-on-non-transparent-pixels.390051/#post-2544449
/// <summary>
///     ClockwiseComparer provides functionality for sorting a collection of Vector2s such
///     that they are ordered clockwise about a given origin.
/// </summary>
public class ClockwiseComparer : IComparer<Vector2>
{
    private Vector2 m_Origin;
 
    /// <summary>