public Vector3 GetMousePositionOnMapWorldSpace(Vector3 mousePositionScreenSpace)
{
//any distance greater than 0 should work, we only need to form a line equation.
mousePositionScreenSpace.z = 1f;
var startingPoint = _currentCamera.transform.position;
var endPoint = _currentCamera.ScreenToWorldPoint(mousePositionScreenSpace);
var mapY = _mapTransform.position.y;
var(x, z) = LineEquations.GetXzGivenY(mapY, startingPoint, endPoint);
return(new Vector3(x, mapY, z));
}
/// <summary>
/// Finding 4 intersection point of camera frustum on the infinite plane(at mapTransform's height).
/// Returning the maximum size of a rect that it can be bounded within the 4 intersection point.
/// </summary>
public (float minWidth, float distanceToTop, float distanceToBottom) GetViewDistanceToFrustumOnPlaneInWorldSpace(
Camera editorCamera,
Transform mapTransform)
{
var cameraFrustumCorners = GetFrustumCorners(editorCamera);
var cameraPosition = editorCamera.transform.position;
var targetYPosition = mapTransform.position.y;
var intersectionCorners = new Vector3[cameraFrustumCorners.Length];
for (var i = 0; i < cameraFrustumCorners.Length; i++)
{
var(x, z) = LineEquations.GetXzGivenY(targetYPosition, cameraPosition, cameraFrustumCorners[i]);
intersectionCorners[i] = new Vector3(x, targetYPosition, z);
}
var distanceToTop = intersectionCorners[1].z - cameraPosition.z;
var distanceToBottom = cameraPosition.z - intersectionCorners[0].z;
var minWidth = intersectionCorners[3].x - intersectionCorners[0].x;
return(minWidth, distanceToTop, distanceToBottom);
}