Using RayCastAll instead of RayCast - unity3d

Question

I have two gameobjects roller and marker. When I use physics raycast it works, but with raycastall it doesn't. I need to use raycastall, because i need to iterate through colliders. When marker is on roller normal raycast doesn't work and I need to use raycastall.
This code works:
if (Input.touchCount > 0)
{
// get mouse position in screen space
// (if touch, gets average of all touches)
Vector3 screenPos = Input.mousePosition;
// set a distance from the camera
screenPos.z = 10.0f;
// convert mouse position to world space
Ray cameraRay = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
Physics.Raycast(cameraRay, out hit);
if (hit.collider.tag == "Floor")
{
transform.position = hit.point;
}
/*
Vector3 worldPos = Camera.main.ScreenToWorldPoint(screenPos);
// get current position of this GameObject
Vector3 newPos = transform.position;
// set x position to mouse world-space x position
newPos.x = worldPos.x;
newPos.z = worldPos.z-3f;
// apply new position
transform.position = newPos;
*/
if (Input.GetTouch(0).phase == TouchPhase.Ended)
{
Destroy(gameObject);
touchhandler = GameObject.Find("Roller").GetComponent<TouchHandler>();
touchhandler.markerexists = false;
}
}
And this doesn't:
if (Input.touchCount > 0)
{
// get mouse position in screen space
// (if touch, gets average of all touches)
Vector3 screenPos = Input.mousePosition;
// set a distance from the camera
screenPos.z = 10.0f;
// convert mouse position to world space
Ray cameraRay = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit[] hits;
hits = Physics.RaycastAll(Camera.main.ScreenPointToRay(Input.mousePosition), 100.0F);
while (i < hits.Length)
{
RaycastHit hit = hits[i];
if (hit.collider.tag == "Floor")
{
transform.position = hit.point;
}
i++;
}
if (Input.GetTouch(0).phase == TouchPhase.Ended)
{
Destroy(gameObject);
touchhandler = GameObject.Find("Roller").GetComponent<TouchHandler>();
touchhandler.markerexists = false;
}
}