// Set mesh geometry by extruding along a set of points.
internal static void Extrude(IList <Vector3> points,
float radius,
int radiusRows,
bool closeLoop,
bool smooth,
ref ProBuilderMesh target,
IList <Quaternion> pointRotations = null)
{
if (points == null || points.Count < 2)
{
return;
}
int cnt = points.Count;
int rows = System.Math.Max(3, radiusRows);
int rowsPlus1 = rows + 1;
int rowsPlus1Times2 = rows * 2;
int vertexCount = ((closeLoop ? cnt : cnt - 1) * 2) * rowsPlus1Times2;
bool vertexCountsMatch = false; // vertexCount == (target == null ? 0 : target.vertexCount);
bool hasPointRotations = pointRotations != null && pointRotations.Count == points.Count;
Vector3[] positions = new Vector3[vertexCount];
Face[] faces = vertexCountsMatch ? null : new Face[(closeLoop ? cnt : cnt - 1) * rows];
int triangleIndex = 0, faceIndex = 0, vertexIndex = 0;
int segmentCount = (closeLoop ? cnt : cnt - 1);
for (int i = 0; i < segmentCount; i++)
{
float secant_a, secant_b;
Quaternion rotation_a = GetRingRotation(points, i, closeLoop, out secant_a);
Quaternion rotation_b = GetRingRotation(points, (i + 1) % cnt, closeLoop, out secant_b);
if (hasPointRotations)
{
rotation_a = rotation_a * pointRotations[i];
rotation_b = rotation_b * pointRotations[(i + 1) % cnt];
}
Vector3[] ringA = VertexRing(rotation_a, points[i], radius, rowsPlus1);
Vector3[] ringB = VertexRing(rotation_b, points[(i + 1) % cnt], radius, rowsPlus1);
System.Array.Copy(ringA, 0, positions, vertexIndex, rowsPlus1Times2);
vertexIndex += rowsPlus1Times2;
System.Array.Copy(ringB, 0, positions, vertexIndex, rowsPlus1Times2);
vertexIndex += rowsPlus1Times2;
if (!vertexCountsMatch)
{
for (int n = 0; n < rowsPlus1Times2; n += 2)
{
faces[faceIndex] = new Face(new int[6]
{
triangleIndex, triangleIndex + 1, triangleIndex + rowsPlus1Times2,
triangleIndex + rowsPlus1Times2, triangleIndex + 1, triangleIndex + rowsPlus1Times2 + 1
});
if (smooth)
{
faces[faceIndex].smoothingGroup = 2;
}
faceIndex++;
triangleIndex += 2;
}
triangleIndex += rowsPlus1Times2;
}
}
if (target != null)
{
if (faces != null)
{
target.RebuildWithPositionsAndFaces(positions, faces);
}
else
{
target.positions = positions;
target.ToMesh();
target.Refresh(RefreshMask.UV | RefreshMask.Colors | RefreshMask.Normals | RefreshMask.Tangents);
}
}
else
{
target = ProBuilderMesh.Create(positions, faces);
}
}
