/// <summary>
/// Perform the raycast against the list of graphics associated with the Canvas.
/// </summary>
/// <param name="eventData">Current event data</param>
/// <param name="resultAppendList">List of hit objects to append new results to.</param>
public override void Raycast(PointerEventData eventData, List <RaycastResult> resultAppendList)
{
if (canvas == null)
{
return;
}
var canvasGraphics = GraphicRegistry.GetRaycastableGraphicsForCanvas(canvas);
if (canvasGraphics == null || canvasGraphics.Count == 0)
{
return;
}
int displayIndex;
var currentEventCamera = eventCamera; // Property can call Camera.main, so cache the reference
if (canvas.renderMode == RenderMode.ScreenSpaceOverlay || currentEventCamera == null)
{
displayIndex = canvas.targetDisplay;
}
else
{
displayIndex = currentEventCamera.targetDisplay;
}
var eventPosition = Display.RelativeMouseAt(eventData.position);
if (eventPosition != Vector3.zero)
{
// We support multiple display and display identification based on event position.
int eventDisplayIndex = (int)eventPosition.z;
// Discard events that are not part of this display so the user does not interact with multiple displays at once.
if (eventDisplayIndex != displayIndex)
{
return;
}
}
else
{
// The multiple display system is not supported on all platforms, when it is not supported the returned position
// will be all zeros so when the returned index is 0 we will default to the event data to be safe.
eventPosition = eventData.position;
#if UNITY_EDITOR
if (Display.activeEditorGameViewTarget != displayIndex)
{
return;
}
eventPosition.z = Display.activeEditorGameViewTarget;
#endif
// We dont really know in which display the event occured. We will process the event assuming it occured in our display.
}
// Convert to view space
Vector2 pos;
if (currentEventCamera == null)
{
// Multiple display support only when not the main display. For display 0 the reported
// resolution is always the desktops resolution since its part of the display API,
// so we use the standard none multiple display method. (case 741751)
float w = Screen.width;
float h = Screen.height;
if (displayIndex > 0 && displayIndex < Display.displays.Length)
{
w = Display.displays[displayIndex].systemWidth;
h = Display.displays[displayIndex].systemHeight;
}
pos = new Vector2(eventPosition.x / w, eventPosition.y / h);
}
else
{
pos = currentEventCamera.ScreenToViewportPoint(eventPosition);
}
// If it's outside the camera's viewport, do nothing
if (pos.x < 0f || pos.x > 1f || pos.y < 0f || pos.y > 1f)
{
return;
}
float hitDistance = float.MaxValue;
Ray ray = new Ray();
if (currentEventCamera != null)
{
ray = currentEventCamera.ScreenPointToRay(eventPosition);
}
if (canvas.renderMode != RenderMode.ScreenSpaceOverlay && blockingObjects != BlockingObjects.None)
{
float distanceToClipPlane = 100.0f;
if (currentEventCamera != null)
{
float projectionDirection = ray.direction.z;
distanceToClipPlane = Mathf.Approximately(0.0f, projectionDirection)
? Mathf.Infinity
: Mathf.Abs((currentEventCamera.farClipPlane - currentEventCamera.nearClipPlane) / projectionDirection);
}
#if PACKAGE_PHYSICS
if (blockingObjects == BlockingObjects.ThreeD || blockingObjects == BlockingObjects.All)
{
if (ReflectionMethodsCache.Singleton.raycast3D != null)
{
var hits = ReflectionMethodsCache.Singleton.raycast3DAll(ray, distanceToClipPlane, (int)m_BlockingMask);
if (hits.Length > 0)
{
hitDistance = hits[0].distance;
}
}
}
#endif
#if PACKAGE_PHYSICS2D
if (blockingObjects == BlockingObjects.TwoD || blockingObjects == BlockingObjects.All)
{
if (ReflectionMethodsCache.Singleton.raycast2D != null)
{
var hits = ReflectionMethodsCache.Singleton.getRayIntersectionAll(ray, distanceToClipPlane, (int)m_BlockingMask);
if (hits.Length > 0)
{
hitDistance = hits[0].distance;
}
}
}
#endif
}
m_RaycastResults.Clear();
Raycast(canvas, currentEventCamera, eventPosition, canvasGraphics, m_RaycastResults);
int totalCount = m_RaycastResults.Count;
for (var index = 0; index < totalCount; index++)
{
var go = m_RaycastResults[index].gameObject;
bool appendGraphic = true;
if (ignoreReversedGraphics)
{
if (currentEventCamera == null)
{
// If we dont have a camera we know that we should always be facing forward
var dir = go.transform.rotation * Vector3.forward;
appendGraphic = Vector3.Dot(Vector3.forward, dir) > 0;
}
else
{
// If we have a camera compare the direction against the cameras forward.
var cameraForward = currentEventCamera.transform.rotation * Vector3.forward * currentEventCamera.nearClipPlane;
appendGraphic = Vector3.Dot(go.transform.position - currentEventCamera.transform.position - cameraForward, go.transform.forward) >= 0;
}
}
if (appendGraphic)
{
float distance = 0;
Transform trans = go.transform;
Vector3 transForward = trans.forward;
if (currentEventCamera == null || canvas.renderMode == RenderMode.ScreenSpaceOverlay)
{
distance = 0;
}
else
{
// http://geomalgorithms.com/a06-_intersect-2.html
distance = (Vector3.Dot(transForward, trans.position - ray.origin) / Vector3.Dot(transForward, ray.direction));
// Check to see if the go is behind the camera.
if (distance < 0)
{
continue;
}
}
if (distance >= hitDistance)
{
continue;
}
var castResult = new RaycastResult
{
gameObject = go,
module = this,
distance = distance,
screenPosition = eventPosition,
displayIndex = displayIndex,
index = resultAppendList.Count,
depth = m_RaycastResults[index].depth,
sortingLayer = canvas.sortingLayerID,
sortingOrder = canvas.sortingOrder,
worldPosition = ray.origin + ray.direction * distance,
worldNormal = -transForward
};
resultAppendList.Add(castResult);
}
}
}