Rotate a position according to forward - unity3d

Question

I am currently making a climbing detection system that follows the player around and detects the closest point the player can climb. I have a game object that casts rays according to the players position. The rays move with the player but do not rotate around. How can I make them rotate with the player ?
This is the code that draws the rays
void Update()
{
//Debug.DrawRay();
raySpace = surfaceWidth / definition;
raySpaceDividedByTwo = raySpace / 2;
surfaceWidthDividedByTwo = surfaceWidth / 2;
for (int i = 0; i < definition; i++)
{
for (int y = 0; y < definition; y++)
{
raycastCoordinates = new Vector3(
(this.transform.position.x + (i * raySpace) + raySpaceDividedByTwo) - surfaceWidthDividedByTwo,
this.transform.position.y,
(this.transform.position.z + (y * raySpace) + raySpaceDividedByTwo) - surfaceWidthDividedByTwo);
//offset = Quaternion.AngleAxis(Input.GetAxis("Mouse X") * turnSpeed, Vector3.up) * offset;
//raycastCoordinates = Quaternion.AngleAxis(this.transform.rotation.y, Vector3.up) * raycastCoordinates;
raycastUpHitsList.Add(Physics.RaycastAll(raycastCoordinates, Vector3.up, detectionHeight, LayerMask.GetMask("Water")));
Debug.DrawRay(raycastCoordinates, Vector3.up * detectionHeight, Color.green, 0.1f);
}
}
}

Answer 1

This should work:
void Update()
{
//Debug.DrawRay();
raySpace = surfaceWidth / definition;
raySpaceDividedByTwo = raySpace / 2;
surfaceWidthDividedByTwo = surfaceWidth / 2;
for (int i = 0; i < definition; i++)
{
for (int y = 0; y < definition; y++)
{
raycastCoordinates = new Vector3(
(this.transform.position.x + (i * raySpace) + raySpaceDividedByTwo) - surfaceWidthDividedByTwo,
this.transform.position.y,
(this.transform.position.z + (y * raySpace) + raySpaceDividedByTwo) - surfaceWidthDividedByTwo) * transform.forward;//if this doesn't work, try transform.right instead
//offset = Quaternion.AngleAxis(Input.GetAxis("Mouse X") * turnSpeed, Vector3.up) * offset;
//raycastCoordinates = Quaternion.AngleAxis(this.transform.rotation.y, Vector3.up) * raycastCoordinates;
raycastUpHitsList.Add(Physics.RaycastAll(raycastCoordinates, Vector3.up, detectionHeight, LayerMask.GetMask("Water")));
Debug.DrawRay(raycastCoordinates, Vector3.up * detectionHeight, Color.green, 0.1f);
}
}
}