2D游戏的残影很简单,美术做序列帧图片就行了,那么3D游戏的残影美术做不了,得靠程序员动态创建模型来处理.
实现原理也很简单:
1.间隔一定时间创建一个残影模型
- GameObject go = GameObject.Instantiate(origin, pos, dir) as GameObject;
2.对残影模型采用特殊的shader,要简单高效
- public class MotionGhost
- {
- public GameObject m_GameObject;
- public List<Material> m_Materials;
- public float m_DurationTime;
- public float m_FadeTime;
- public float m_Time;
-
- public MotionGhost(GameObject go, Color color, float durationTime, float fadeTime)
- {
- m_GameObject = go;
- m_DurationTime = durationTime;
- m_FadeTime = fadeTime;
- m_Time = durationTime;
-
- if (MotionGhostMgr.Instance.m_MaterialMotionGhost == null)
- MotionGhostMgr.Instance.m_MaterialMotionGhost = Resources.Load("Material/MotionGhost");
-
- m_Materials = new List<Material>();
- foreach (Renderer renderer in go.GetComponentsInChildren<Renderer>())
- {
- if (renderer as MeshRenderer || renderer as SkinnedMeshRenderer)
- {
-
- Material[] newMaterials = new Material[1];
- newMaterials[0] = GameObject.Instantiate(MotionGhostMgr.Instance.m_MaterialMotionGhost) as Material;
- if (newMaterials[0].HasProperty("_RimColor"))
- newMaterials[0].SetColor("_RimColor", color);
- renderer.materials = newMaterials;
-
- m_Materials.Add(renderer.material);
- }
- else
- {
-
- renderer.enabled = false;
- }
- }
- }
- }
3.残影淡入淡出的处理
- public void Tick()
- {
- for (int i = m_MotionGhosts.Count - 1; i >= 0; --i)
- {
- m_MotionGhosts[i].m_Time -= Time.deltaTime;
-
-
- if (m_MotionGhosts[i].m_Time <= 0)
- {
- GameObject.Destroy(m_MotionGhosts[i].m_GameObject);
- m_MotionGhosts.RemoveAt(i);
- --m_Counter;
- continue;
- }
-
-
- if (m_MotionGhosts[i].m_Time < m_MotionGhosts[i].m_FadeTime)
- {
- float alpha = m_MotionGhosts[i].m_Time / m_MotionGhosts[i].m_FadeTime;
- foreach (Material material in m_MotionGhosts[i].m_Materials)
- {
- if (material.HasProperty("_RimColor"))
- {
- Color color = material.GetColor("_RimColor");
- color *= alpha;
- material.SetColor("_RimColor", color);
- }
- }
- }
- }
- }
残影+扭曲的效果:
残影效果:
