/// <summary>
/// Set the line color at the start and at the end
/// </summary>
public void SetColors(Color start, Color end)
{
// Worth detecting a no op consideirng how much this function can potentially do
if (start == m_ColorStart && end == m_ColorEnd)
{
return;
}
// Update internal data
m_ColorStart = start;
m_ColorEnd = end;
// See if the data needs initializing
if (Initialize())
{
return;
}
// If it doesn't, go through each point and set the data
var pointCounter = 0;
var elementCounter = 0;
m_MeshData.SetElementColor(elementCounter, ref m_ColorStart);
elementCounter++;
pointCounter++;
float stepSize = 1.0f / Mathf.Max((m_Positions.Length - 1.0f), 1.0f);
float stepPercent = stepSize;
var lastColor = m_ColorStart;
while (pointCounter < m_Positions.Length)
{
var currentColor = Color.Lerp(m_ColorStart, m_ColorEnd, stepPercent);
m_MeshData.SetElementColor(elementCounter, ref lastColor, ref currentColor);
elementCounter++;
m_MeshData.SetElementColor(elementCounter, ref currentColor);
lastColor = currentColor;
elementCounter++;
pointCounter++;
stepPercent += stepSize;
}
// Dirty the color meshChain flags so the mesh gets new data
m_MeshData.SetMeshDataDirty(VRLineRendererInternal.MeshChain.MeshRefreshFlag.Colors);
m_MeshNeedsRefreshing = true;
}
/// <summary>
/// Updates the built-in mesh data for each control point of the trail
/// </summary>
void LateUpdate()
{
// We do the actual internal mesh updating as late as possible so nothing ends up a frame behind
var deltaTime = Time.deltaTime;
// We give the editor a little help with handling delta time in edit mode
if (Application.isPlaying == false)
{
deltaTime = Time.realtimeSinceStartup - m_EditorDeltaHelper;
m_EditorDeltaHelper = Time.realtimeSinceStartup;
}
// Get the current position of the renderer
var currentPoint = transform.position;
var pointDistance = (currentPoint - m_LastRecordedPoint).sqrMagnitude;
// Is it more than minVertexDistance from the last position?
if (pointDistance > (m_MinVertexDistance * m_MinVertexDistance))
{
// In the situation we have no points, we need to record the start point as well
if (m_PointIndexStart == m_PointIndexEnd)
{
m_Points[m_PointIndexStart] = m_LastRecordedPoint;
m_PointTimes[m_PointIndexStart] = m_Time;
}
// Make space for a new point
var newEndIndex = (m_PointIndexEnd + 1) % m_MaxTrailPoints;
// In the situation that we are rendering all available vertices
// We can either keep using the current point, or take the last point, depending on the user's preference
if (newEndIndex != m_PointIndexStart)
{
m_PointIndexEnd = newEndIndex;
m_PointTimes[m_PointIndexEnd] = 0;
m_UsedPoints++;
}
else
{
if (m_StealLastPointWhenEmpty)
{
m_MeshData.SetElementSize(m_PointIndexStart * 2, 0);
m_MeshData.SetElementSize((m_PointIndexStart * 2) + 1, 0);
m_PointIndexStart = (m_PointIndexStart + 1) % m_MaxTrailPoints;
m_PointIndexEnd = newEndIndex;
m_PointTimes[m_PointIndexEnd] = 0;
m_LastPointTime = m_PointTimes[m_PointIndexStart];
}
}
m_Points[m_PointIndexEnd] = currentPoint;
// Update the last recorded point
m_LastRecordedPoint = currentPoint;
}
// Do time processing
// The end point counts up to a maximum of 'time'
m_PointTimes[m_PointIndexEnd] = Mathf.Min(m_PointTimes[m_PointIndexEnd] + deltaTime, m_Time);
if (m_PointIndexStart != m_PointIndexEnd)
{
// Run down the counter on the start point
m_PointTimes[m_PointIndexStart] -= deltaTime;
// If we've hit 0, this point is done for
if (m_PointTimes[m_PointIndexStart] <= 0.0f)
{
m_MeshData.SetElementSize(m_PointIndexStart * 2, 0);
m_MeshData.SetElementSize((m_PointIndexStart * 2) + 1, 0);
m_PointIndexStart = (m_PointIndexStart + 1) % m_MaxTrailPoints;
m_LastPointTime = m_PointTimes[m_PointIndexStart];
m_UsedPoints--;
}
}
if (m_PointIndexStart != m_PointIndexEnd)
{
m_MeshNeedsRefreshing = true;
m_MeshRenderer.enabled = true;
}
else
{
m_MeshNeedsRefreshing = false;
m_MeshRenderer.enabled = false;
}
if (m_MeshNeedsRefreshing == true)
{
m_MeshRenderer.enabled = true;
// Update first and last points position-wise
var nextIndex = (m_PointIndexStart + 1) % m_MaxTrailPoints;
if (m_SmoothInterpolation)
{
var toNextPoint = 1.0f - (m_PointTimes[m_PointIndexStart] / m_LastPointTime);
var lerpPoint = Vector3.Lerp(m_Points[m_PointIndexStart], m_Points[nextIndex], toNextPoint);
m_MeshData.SetElementPosition((m_PointIndexStart * 2), ref lerpPoint);
m_MeshData.SetElementPipe((m_PointIndexStart * 2) + 1, ref lerpPoint, ref m_Points[nextIndex]);
}
else
{
m_MeshData.SetElementPosition((m_PointIndexStart * 2), ref m_Points[m_PointIndexStart]);
m_MeshData.SetElementPipe((m_PointIndexStart * 2) + 1, ref m_Points[m_PointIndexStart], ref m_Points[nextIndex]);
}
var prevIndex = m_PointIndexEnd - 1;
if (prevIndex < 0)
{
prevIndex = m_MaxTrailPoints - 1;
}
m_MeshData.SetElementPipe((prevIndex * 2) + 1, ref m_Points[prevIndex], ref m_Points[m_PointIndexEnd]);
m_MeshData.SetElementPosition((m_PointIndexEnd * 2), ref m_Points[m_PointIndexEnd]);
// Go through all points and update size and color
var pointUpdateCounter = m_PointIndexStart;
var pointCount = 0;
var blendStep = 1.0f / m_UsedPoints;
var colorValue = 1.0f;
while (pointUpdateCounter != m_PointIndexEnd)
{
var currentBlend = blendStep * pointCount;
var nextBlend = blendStep * (pointCount + 1.0f);
var currentWidth = Mathf.Lerp(m_EndWidth, m_StartWidth, currentBlend);
var nextWidth = Mathf.Lerp(m_EndWidth, m_StartWidth, nextBlend);
m_MeshData.SetElementSize(pointUpdateCounter * 2, currentWidth);
m_MeshData.SetElementSize((pointUpdateCounter * 2) + 1, currentWidth, nextWidth);
var currentColor = GetLerpedColor(colorValue);
var nextColor = GetLerpedColor(colorValue - blendStep);
m_MeshData.SetElementColor(pointUpdateCounter * 2, ref currentColor);
m_MeshData.SetElementColor((pointUpdateCounter * 2) + 1, ref currentColor, ref nextColor);
pointUpdateCounter = (pointUpdateCounter + 1) % m_MaxTrailPoints;
pointCount++;
colorValue -= blendStep;
}
m_MeshData.SetElementSize((m_PointIndexEnd * 2), m_StartWidth);
m_MeshData.SetElementColor((m_PointIndexEnd * 2), ref m_Colors[0]);
m_MeshData.SetMeshDataDirty(VRLineRendererInternal.MeshChain.MeshRefreshFlag.All);
m_MeshData.RefreshMesh();
}
}
