UnmaskRaycastFilter is not reliable

[rozx]

UnmaskRaycastFilter is not reliable?

So for our project, since our camera is using perspective projection, the funciton

camera.WorldToScreenPoint() is not reliable when converting from world position to screen point, therefore the UnmaskRaycastFilter's function IsRaycastLocationValid() is always returning false no matter what.

However I have found a solution for this: instead of using camera.WorldToScreenPoint(), unity has a build in function RectTransformUtility.RectangleContainsScreenPoint() to check whether a screen point is inside the rect transform. So maybe this is better? At least it worked for me 😄

Here is the modified version of IsRaycastLocationValid() function:

public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
{
  // Skip if deactived.
  if (!isActiveAndEnabled || !m_TargetUnmask || !m_TargetUnmask.isActiveAndEnabled){
   return true;
  }
    // check inside
  return !RectTransformUtility.RectangleContainsScreenPoint((m_TargetUnmask.transform as RectTransform), sp);
}

[mob-sakai]

Hi @rozx
Thunk you for your reporting.

Yes, we should use RectTransformUtility.RectangleContainsScreenPoint.