public void Regenerate()
{
// Create or clear mesh
if (mesh == null)
{
mesh = new Mesh();
mesh.name = "Spiral";
mesh.hideFlags = HideFlags.DontSave;
}
else
{
mesh.Clear();
}
// Apply mesh to filter
if (cachedMeshFilter == null)
{
cachedMeshFilter = GetComponent <MeshFilter>();
}
cachedMeshFilter.sharedMesh = mesh;
// Invalid segment count?
if (InvalidSegmentCount == true)
{
return;
}
// Allocate arrays?
var vertexCount = SegmentCount * 2 + 2;
if (positions == null || positions.Length != vertexCount)
{
positions = new Vector3[vertexCount];
}
if (uvs == null || uvs.Length != vertexCount)
{
uvs = new Vector2[vertexCount];
}
// Generate indices?
if (indices == null || indices.Length != SegmentCount * 6)
{
indices = new int[SegmentCount * 6];
for (var i = 0; i < SegmentCount; i++)
{
indices[i * 6 + 0] = i * 2 + 0;
indices[i * 6 + 1] = i * 2 + 1;
indices[i * 6 + 2] = i * 2 + 2;
indices[i * 6 + 3] = i * 2 + 3;
indices[i * 6 + 4] = i * 2 + 2;
indices[i * 6 + 5] = i * 2 + 1;
}
}
var angle = InitialAngle;
var distance = InitialDistance;
for (var i = 0; i <= SegmentCount; i++)
{
var vertex = i * 2;
positions[vertex + 0] = VA_Helper.SinCos(angle * Mathf.Deg2Rad) * distance;
positions[vertex + 1] = VA_Helper.SinCos(angle * Mathf.Deg2Rad) * (distance + SegmentThickness);
uvs[vertex + 0] = Vector2.zero;
uvs[vertex + 1] = Vector2.one;
angle += AngleStep;
distance += DistanceStep;
}
// Update mesh
mesh.vertices = positions;
mesh.triangles = indices;
mesh.uv = uvs;
mesh.RecalculateBounds();
mesh.RecalculateNormals();
}