/// <summary>
/// Updates points' positions from time to time.
/// </summary>
/// <param name="line"></param>
/// <param name="deltaTime"></param>
private void UpdatePoints(TrailGraphics trail, float deltaTime)
{
for (int i = 0; i < trail.points.Count; i++)
{
trail.points[i].Update(deltaTime);
}
}
protected override void UpdateTrail(TrailGraphics trail, float deltaTime)
{
if (trail.points.Count <= 0 || !updateNow)
{
return;
}
Segment(trail.points.Count - 1, m_transform.position, trail);
for (int i = trail.points.Count - 1; i > 0; i--)
{
Segment(i - 1, trail.points[i].position, trail);
}
updateNow = false;
}
/// <summary>
/// Count the points whose life time have not passed yet.
/// We do nothing to those whose life time have passed.
/// Because we are using RingBuffer as an Object Pool :)
/// </summary>
/// <param name="trail"></param>
/// <returns></returns>
private int ActivePointsNumber(TrailGraphics trail)
{
int count = 0;
for (int i = 0; i < trail.points.Count; i++)
{
if (trail.points[i].timeSoFar < parameter.lifeTime)
{
count++;
}
}
return(count);
}
private void Segment(int i, Vector3 pos, TrailGraphics trail)
{
Vector3 d = pos - trail.points[i].position;
float mag = d.magnitude;
if (mag <= 0.001f)
{
mag = 1f;
}
Vector3 temp = Vector3.zero;
temp.x = pos.x - Vector3.Dot(right, d) * jointDistance * followScale / mag;
temp.y = pos.y - Vector3.Dot(up, d) * jointDistance * followScale / mag;
temp.z = pos.z - Vector3.Dot(forward, d) * jointDistance * followScale / mag;
trail.points[i].position = temp;
}
/// <summary>
/// Just in case the Emission is suddenly shut-down or activated.
/// </summary>
private void CheckEmitChange()
{
if (isEmitting != Emit)
{
isEmitting = Emit;
if (isEmitting)
{
activeTrail = new TrailGraphics(GetMaxPoints());
activeTrail.activeSelf = true;
OnStartEmit();
}
else
{
OnStopEmit();
activeTrail.activeSelf = false;
fadingTrails.Add(activeTrail);
activeTrail = null;
}
}
}
/// <summary>
/// De-constructor.
/// </summary>
protected virtual void OnDestroy()
{
totalTrailsCount--;
if (totalTrailsCount == 0)
{
if (generatedMeshes != null && generatedMeshes.Count > 0)
{
foreach (Mesh m in generatedMeshes)
{
#if UNITY_EDITOR
DestroyImmediate(m, true);
#else
Destroy(m);
#endif
}
}
generatedMeshes = null;
mat2Trail.Clear();
mat2Trail = null;
}
if (activeTrail != null)
{
activeTrail.Dispose();
activeTrail = null;
}
if (fadingTrails != null)
{
foreach (TrailGraphics fadingTrail in fadingTrails)
{
if (fadingTrail != null)
{
fadingTrail.Dispose();
}
}
fadingTrails.Clear();
}
}
/// <summary>
/// De-constructor.
/// </summary>
protected virtual void OnDestroy()
{
totalTrailsCount--;
if (activeTrail != null)
{
activeTrail.Dispose();
activeTrail = null;
}
if (fadingTrails != null)
{
foreach (TrailGraphics fadingTrail in fadingTrails)
{
if (fadingTrail != null)
{
fadingTrail.Dispose();
}
}
fadingTrails.Clear();
}
}
/// <summary>
/// Serves as a variable-initializer.
/// </summary>
protected virtual void Awake()
{
totalTrailsCount++;
parameter.isCross = parameter.trailType == TrailType.Cross;
///The only Guy :) Last Titan Standing.
if (totalTrailsCount == 1)
{
//mat2Trail = new Dictionary<Material, List<TrailGraphics>>();
//generatedMeshes = new List<Mesh>();
}
fadingTrails = new List <TrailGraphics>();
m_transform = transform;
isEmitting = Emit;
if (isEmitting)
{
activeTrail = new TrailGraphics(GetMaxPoints(), parameter.isCross);
activeTrail.activeSelf = true;
OnStartEmit();
}
}
/// <summary>
/// Serves as a variable-initializer.
/// </summary>
protected virtual void Awake()
{
totalTrailsCount++;
///The only Guy :) Last Titan Standing.
if (totalTrailsCount == 1)
{
mat2Trail = new Dictionary <Material, List <TrailGraphics> >();
generatedMeshes = new List <Mesh>();
}
fadingTrails = new List <TrailGraphics>();
m_transform = transform;
isEmitting = Emit;
if (parameter.orientationType == TrailOrientation.LookAt && parameter.lookAt == null)
{
if (Camera.main != null)
{
parameter.lookAt = Camera.main.transform;
Debug.Log(gameObject.name + ": 未指定面向物体, 因此默认面向主摄像机. ");
}
else
{
parameter.orientationType = TrailOrientation.Local;
parameter.forwardOverride = Vector3.forward;
Debug.Log(gameObject.name + ": 无法指定当前Trail的朝向, 为避免错误转化为Local. ");
}
}
if (isEmitting)
{
activeTrail = new TrailGraphics(GetMaxPoints());
activeTrail.activeSelf = true;
OnStartEmit();
}
}
/// <summary>
/// Just in case the Emission is suddenly shut-down or activated.
/// </summary>
private void CheckEmitChange()
{
if (isEmitting != Emit)
{
isEmitting = Emit;
if (isEmitting)
{
activeTrail = new TrailGraphics(GetMaxPoints(), parameter.isCross);
activeTrail.activeSelf = true;
OnStartEmit();
}
else
{
if (activeTrail == null)
{
return;
}
OnStopEmit();
activeTrail.activeSelf = false;
fadingTrails.Add(activeTrail);
activeTrail = null;
}
}
}
protected override void UpdateTrail(TrailGraphics trail, float deltaTime)
{
if (!trail.activeSelf)
{
return;
}
int trailPointIdx = 0;
for (int i = 0; i < controlPoints.Count; i++)
{
trail.points[trailPointIdx].position = controlPoints[i].position;
trail.points[trailPointIdx].forwardDirection = controlPoints[i].forward;
trailPointIdx++;
if (i < controlPoints.Count - 1)
{
Vector3 cp1, cp2;
float distance = Vector3.Distance(controlPoints[i].position, controlPoints[i + 1].position) / 2;
if (i == 0)
{
cp1 = controlPoints[i].position + (controlPoints[i + 1].position - controlPoints[i].position).normalized * distance;
}
else
{
cp1 = controlPoints[i].position + (controlPoints[i + 1].position - controlPoints[i - 1].position).normalized * distance;
}
int nextIdx = i + 1;
if (nextIdx == controlPoints.Count - 1)
{
cp2 = controlPoints[nextIdx].position + (controlPoints[nextIdx - 1].position - controlPoints[nextIdx].position).normalized * distance;
}
else
{
cp2 = controlPoints[nextIdx].position + (controlPoints[nextIdx - 1].position - controlPoints[nextIdx + 1].position).normalized * distance;
}
TrailPoint current = trail.points[trailPointIdx - 1];
TrailPoint next = trail.points[trailPointIdx + pointsInMiddle];
for (int j = 0; j < pointsInMiddle; j++)
{
float t = (((float)j + 1) / ((float)pointsInMiddle + 1));
trail.points[trailPointIdx].position = Bezier.CalculateCubic(t, controlPoints[i].position, cp1, cp2, controlPoints[i + 1].position);
trail.points[trailPointIdx].timeSoFar = Mathf.Lerp(current.timeSoFar, next.timeSoFar, t);
trail.points[trailPointIdx].forwardDirection = Vector3.Lerp(current.forwardDirection, next.forwardDirection, t);
trailPointIdx++;
}
}
}
int lastCPIdx = (pointsInMiddle + 1) * (controlPoints.Count - 1);
int prevCPIdx = lastCPIdx - pointsInMiddle - 1;
int activeCount = lastCPIdx + 1;
float distance2Src = trail.points[prevCPIdx].distance2Src;
for (int i = prevCPIdx + 1; i < activeCount; i++)
{
distance2Src += Vector3.Distance(trail.points[i - 1].position, trail.points[i].position);
trail.points[i].distance2Src = distance2Src;
}
}
/// <summary>
/// Help a trail generate its own Mesh.
/// </summary>
/// <param name="trail"></param>
private void GenerateMesh(TrailGraphics trail)
{
trail.mesh.Clear(false);
Vector3 cameraForward = Camera.main.transform.forward;
///Determine the trail forward direction.
switch (parameter.orientationType)
{
case TrailOrientation.LookAt:
cameraForward = (parameter.lookAt.position - m_transform.position).normalized;
break;
case TrailOrientation.Local:
cameraForward = m_transform.forward;
break;
case TrailOrientation.World:
cameraForward = parameter.forwardOverride.normalized;
break;
default:
break;
}
trail.activeCount = ActivePointsNumber(trail);
///No way to draw a Mesh with only 2 vertices or even less. Exit.
if (trail.activeCount < 2)
{
return;
}
int vertIdx = 0;
for (int i = 0; i < trail.points.Count; i++)
{
TrailPoint tp = trail.points[i];
float timeFraction = tp.timeSoFar / parameter.lifeTime;
if (timeFraction > 1)
{
continue;
}
if (parameter.orientationType == TrailOrientation.Local)
{
cameraForward = tp.forwardDirection;
}
Vector3 cross = Vector3.zero;
if (i < trail.points.Count - 1)
{
cross = Vector3.Cross((trail.points[i + 1].position - tp.position).normalized, cameraForward).normalized;
}
else
{
cross = Vector3.Cross((tp.position - trail.points[i - 1].position).normalized, cameraForward).normalized;
}
Color c = parameter.colorOverLife.Evaluate(1 - (float)vertIdx / (float)trail.activeCount / 2f);
float s = parameter.sizeOverLife.Evaluate(timeFraction);
trail.vertices[vertIdx] = tp.position + cross * s;
trail.uvs[vertIdx] = new Vector2(tp.distance2Src / parameter.quadScaleFactor, 0.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
trail.vertices[vertIdx] = tp.position - cross * s;
trail.uvs[vertIdx] = new Vector2(tp.distance2Src / parameter.quadScaleFactor, 1.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
}
///"Stack" all redundant vertices into the termination position.
Vector2 termination = trail.vertices[vertIdx - 1];
for (int i = vertIdx; i < trail.vertices.Length; i++)
{
trail.vertices[i] = termination;
}
///Now let's focus on triangle array ...
int triIdx = 0;
for (int i = 0, imax = 2 * (trail.activeCount - 1); i < imax; i++)
{
///Ok, start point.
if (i % 2 == 0)
{
trail.indices[triIdx++] = i;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i + 2;
}
else ///Reverse the process.
{
trail.indices[triIdx++] = i + 2;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i;
}
}
///"Squash" all the redundant vertices and triangle arrays.
int termIdx = trail.indices[triIdx - 1];
for (int i = triIdx; i < trail.indices.Length; i++)
{
trail.indices[i] = termIdx;
}
///So now comes the Exciting part. CONG!
trail.mesh.vertices = trail.vertices;
///Setting Indices array directly to mesh also works.
trail.mesh.SetIndices(trail.indices, MeshTopology.Triangles, 0);
trail.mesh.uv = trail.uvs;
trail.mesh.normals = trail.normals;
trail.mesh.colors = trail.colors;
}
protected virtual void UpdateTrail(TrailGraphics trail, float deltaTime)
{
}
/// <summary>
/// Help a trail generate its own Mesh.
/// </summary>
/// <param name="trail"></param>
private void GenerateMesh(TrailGraphics trail)
{
trail.mesh.Clear(false);
Vector3 cameraForward = GetFacing();
trail.activeCount = ActivePointsNumber(trail);
/// No way to draw a Mesh with only 2 vertices or even less. Exit.
if (trail.activeCount < 2)
{
return;
}
int vertIdx = 0;
Vector3 lastCross = cameraForward;
if (parameter.trailType == TrailType.Vertical || parameter.isCross)
{
for (int i = 0; i < trail.points.Count; i++)
{
TrailPoint tp = trail.points[i];
float timeFraction = tp.timeSoFar / parameter.lifeTime;
if (timeFraction > 1)
{
continue;
}
if (parameter.orientationType == TrailOrientation.Local)
{
cameraForward = tp.forwardDirection;
}
Vector3 cross = Vector3.zero;
Vector3 moveDir = cameraForward;
if (i < trail.points.Count - 1)
{
moveDir = (trail.points[i + 1].position - tp.position).normalized;
}
else
{
moveDir = (tp.position - trail.points[i - 1].position).normalized;
}
cross = Vector3.Cross(moveDir, cameraForward).normalized;
if (cross.magnitude < 0.9f)
{
cross = lastCross.normalized;
}
else if (Vector3.Dot(cross, lastCross) < 0f)
{
cross = -cross;
lastCross = -cross;
}
else
{
lastCross = cross;
}
Color c = parameter.colorOverLife.Evaluate(1 - (float)vertIdx / (float)trail.activeCount / 2f);
float s = parameter.sizeOverLife.Evaluate(timeFraction);
float uvx = parameter.isTile ? tp.distance2Src / parameter.quadScaleFactor : 1 - timeFraction;
Vector3 offset = cross * s * parameter.sizeMultiplier;
trail.vertices[vertIdx] = tp.position + offset;
trail.uvs[vertIdx] = new Vector2(uvx, 0.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
trail.vertices[vertIdx] = tp.position - offset;
trail.uvs[vertIdx] = new Vector2(uvx, 1.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
}
}
int oldVertIdx = vertIdx;
lastCross = cameraForward;
if (parameter.trailType == TrailType.Horizontal || parameter.isCross)
{
for (int i = 0; i < trail.points.Count; i++)
{
TrailPoint tp = trail.points[i];
float timeFraction = tp.timeSoFar / parameter.lifeTime;
if (timeFraction > 1)
{
continue;
}
if (parameter.orientationType == TrailOrientation.Local)
{
cameraForward = tp.forwardDirection;
}
Vector3 cross = cameraForward;
Color c = parameter.colorOverLife.Evaluate(1 - ((float)vertIdx - oldVertIdx) / (float)trail.activeCount / 2f);
float s = parameter.sizeOverLife.Evaluate(timeFraction);
float uvx = parameter.isTile ? tp.distance2Src / parameter.quadScaleFactor : 1 - timeFraction;
Vector3 offset = cross * s * parameter.sizeMultiplier;
trail.vertices[vertIdx] = tp.position + offset;
trail.uvs[vertIdx] = new Vector2(uvx, 0.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
trail.vertices[vertIdx] = tp.position - offset;
trail.uvs[vertIdx] = new Vector2(uvx, 1.0f);
trail.normals[vertIdx] = cameraForward;
trail.colors[vertIdx] = c;
vertIdx++;
}
}
/// "Stack" all redundant vertices into the termination position.
Vector3 termination = trail.vertices[vertIdx - 1];
for (int i = vertIdx; i < trail.vertices.Length; i++)
{
trail.vertices[i] = termination;
}
/// Now let's focus on triangle array ...
int triIdx = 0;
for (int i = 0, imax = 2 * (trail.activeCount - 1); i < imax; i++)
{
/// Ok, start point.
if (i % 2 == 0)
{
trail.indices[triIdx++] = i;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i + 2;
}
else /// Reverse the process.
{
trail.indices[triIdx++] = i + 2;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i;
}
}
if (parameter.isCross)
{
for (int i = 2 * trail.activeCount, imax = 4 * trail.activeCount - 2; i < imax; i++)
{
if (i % 2 == 0)
{
trail.indices[triIdx++] = i;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i + 2;
}
else
{
trail.indices[triIdx++] = i + 2;
trail.indices[triIdx++] = i + 1;
trail.indices[triIdx++] = i;
}
}
}
/// "Squash" all the redundant vertices and triangle arrays.
int termIdx = trail.indices[triIdx - 1];
for (int i = triIdx; i < trail.indices.Length; i++)
{
trail.indices[i] = termIdx;
}
/// So now comes the Exciting part. CONG!
trail.mesh.vertices = trail.vertices;
/// Setting Indices array directly to mesh also works.
trail.mesh.SetIndices(trail.indices, MeshTopology.Triangles, 0);
trail.mesh.uv = trail.uvs;
trail.mesh.normals = trail.normals;
trail.mesh.colors = trail.colors;
}