using UnityEngine;
|
using System.Collections;
|
|
namespace DynamicShadowProjector {
|
public class FollowTargetObject : MonoBehaviour {
|
public enum TextureAlignment {
|
None = 0,
|
TargetAxisX,
|
TargetAxisY,
|
TargetAxisZ,
|
}
|
public enum UpdateFunction {
|
OnPreCull = 0,
|
LateUpdate,
|
UpdateTransform,
|
}
|
// Serialize Fields
|
[SerializeField]
|
private Transform m_target;
|
[SerializeField]
|
private Transform m_targetDirection = null;
|
[SerializeField]
|
private TextureAlignment m_textureAlignment = TextureAlignment.None;
|
[SerializeField]
|
private UpdateFunction m_updateFunction = UpdateFunction.LateUpdate;
|
|
// public properties
|
public Transform target
|
{
|
get { return m_target; }
|
set { m_target = value; }
|
}
|
public Transform targetDirection
|
{
|
get { return m_targetDirection; }
|
set { m_targetDirection = value; }
|
}
|
public TextureAlignment textureAlignment
|
{
|
get { return m_textureAlignment; }
|
set { m_textureAlignment = value; }
|
}
|
public UpdateFunction updateFunction
|
{
|
get { return m_updateFunction; }
|
set { m_updateFunction = value; }
|
}
|
|
public void UpdateTransform()
|
{
|
if (m_textureAlignment != TextureAlignment.None || m_targetDirection != null) {
|
// rotate projector to align texture parallel to target object.
|
Vector3 up;
|
switch (m_textureAlignment) {
|
case TextureAlignment.TargetAxisX:
|
up = m_target.right;
|
break;
|
case TextureAlignment.TargetAxisZ:
|
up = m_target.forward;
|
break;
|
default:
|
up = m_target.up;
|
break;
|
}
|
Vector3 z = m_targetDirection != null ? m_targetDirection.forward : transform.forward;
|
transform.LookAt(transform.position + z, up);
|
}
|
Vector3 targetPos = transform.TransformPoint(m_localTargetPosition);
|
transform.position += m_target.position - targetPos;
|
}
|
|
private Vector3 m_localTargetPosition;
|
|
// message handlers
|
void Awake()
|
{
|
if (m_target != null) {
|
m_localTargetPosition = transform.InverseTransformPoint(m_target.position);
|
}
|
}
|
|
void LateUpdate()
|
{
|
#if UNITY_EDITOR
|
if (!Application.isPlaying) {
|
return;
|
}
|
#endif
|
if (m_updateFunction == UpdateFunction.LateUpdate) {
|
UpdateTransform();
|
}
|
}
|
|
void OnPreCull()
|
{
|
#if UNITY_EDITOR
|
if (!Application.isPlaying) {
|
return;
|
}
|
#endif
|
if (m_updateFunction == UpdateFunction.OnPreCull) {
|
UpdateTransform();
|
}
|
}
|
}
|
}
|
