private void InitSegmentsIfNull()
{
_segments = new QuadSegment[SegmentsCount];
for (var i = 0; i < SegmentsCount; i++)
{
_segments[i] = new QuadSegment();
}
_segmentTris = new int[(SegmentsCount - 1) * 4 * 3];
for (var segment = 0; segment < SegmentsCount - 1; segment++)
{
var vno = segment * 3;
var ind = segment * 3 * 4;
_segmentTris[ind] = vno; _segmentTris[ind + 1] = vno + 1; _segmentTris[ind + 2] = vno + 2;
ind += 3;
_segmentTris[ind] = vno; _segmentTris[ind + 1] = vno + 2; _segmentTris[ind + 2] = vno + 3; //
ind += 3;
_segmentTris[ind] = vno + 2; _segmentTris[ind + 1] = vno + 1; _segmentTris[ind + 2] = vno + 4; //
ind += 3;
_segmentTris[ind] = vno + 3; _segmentTris[ind + 1] = vno + 2; _segmentTris[ind + 2] = vno + 4; //
}
}
public Mesh GetStreak(Vector3 from, Vector3 to, float streakWidth, bool head, bool tail)
{
InitSegmentsIfNull();
var headSegment = _segments[SegmentsCount - 1];
var tailSegment = _segments[0];
var vector = to - from;
Vector3 fromA;
Vector3 fromB;
var side = Vector3.Cross(vector, Vector3.forward).normalized *streakWidth / 2;
if (!tail)
{
fromA = _prevA;
fromB = _prevB;
}
else
{
fromA = from + side;
fromB = from - side;
}
var toA = to + side;
var toB = to - side;
var dirA = toA - fromA;
var dirB = toB - fromB;
var offA = dirA.normalized * streakWidth * 0.5f;
var offB = dirB.normalized * streakWidth * 0.5f;
if (head)
{
headSegment.vertices[0] = toA + offA;
headSegment.vertices[1] = toB + offB;
}
if (tail)
{
tailSegment.vertices[0] = fromA - offA;
tailSegment.vertices[1] = fromB - offB;
}
var till = SegmentsCount - (head ? 1 : 0);
var midSegment = SegmentsCount - 1 - ((tail ? 1 : 0) + (head ? 1 : 0));
var stepA = (toA - fromA) / midSegment;
var stepB = (toB - fromB) / midSegment;
for (var i = (tail ? 1 : 0); i < till; i++)
{
var q = _segments[i];
q.vertices[0] = fromA; //from+ side;
q.vertices[1] = fromB; //from- side;
// from += step;
fromA += stepA;
fromB += stepB;
}
headSegment.SetSection(head ? SectionType.Head : SectionType.Center);
tailSegment.SetSection(tail ? SectionType.Tail : SectionType.Center);
for (var i = 0; i < SegmentsCount - 1; i++)
{
_segments[i].SetCenter(_segments[i + 1]);
}
var initializing = (!_segmentMesh);
if (initializing)
{
_segmentMesh = new Mesh();
}
_segmentMesh.vertices = QuadSegment.VertexArrayFrom(_segments);
_segmentMesh.uv = QuadSegment.UvArrayFrom(_segments);
if (initializing)
{
_segmentMesh.triangles = _segmentTris;
}
_prevA = toA;
_prevB = toB;
_segmentMesh.name = "Segment Mesh";
return(_segmentMesh);
}
public void SetCenter(QuadSegment next)
{
vertices[2] = (vertices[0] + vertices[1] + next.vertices[0] + next.vertices[1]) / 4;
_uv[2] = (_uv[0] + _uv[1] + next._uv[0] + next._uv[1]) / 4;
}