// Generates a procedural mesh and returns it.
// spline the Spline this mesh is going to be based on
// helper a helper transform object which is used to generate the mesh
// sides the number of sides that make up a segment
// radius the circular size of each segment
// textureWrap how many times the texture repeats around a segment
// textureLength how long the texture loops on the mesh in world space
public static Mesh GenerateMesh(Spline spline, Transform helper, int sides, float radius, float textureWrap, float textureLength)
{
Vector3 helperPos = helper.position;
Quaternion helperRot = helper.rotation;
List <Vector3> verts = new List <Vector3>();
List <Vector3> norms = new List <Vector3>();
List <Vector2> uvs = new List <Vector2>();
List <int> tris = new List <int>();
for (int i = 0; i < spline.sectionCount; i++)
{
for (int j = 1; j < spline.segmentCount - 1; j++)
{
float angle = 360f / sides;
helper.position = spline.vertices[i, j] + spline.normals[i, j] * radius;
for (int k = 0; k <= sides; k++)
{
verts.Add(helper.position);
norms.Add((helper.position - spline.vertices[i, j]).normalized);
float u = textureWrap * k / sides;
float v = spline.lengths[i, j];
for (int l = 0; l < i; l++)
{
v += spline.lengths[l, spline.segmentCount - 1];
}
uvs.Add(new Vector2(u, v / textureLength));
helper.RotateAround(spline.vertices[i, j], spline.tangents[i, j], angle);
}
}
int trisPerSegment = sides + 1;
int trisPerSection = (spline.segmentCount - 2) * trisPerSegment;
int section = i * trisPerSection;
for (int j = 0; j < spline.segmentCount - 3; j++)
{
int segment1 = j * trisPerSegment;
int segment2 = (j + 1) * trisPerSegment;
for (int k = 0; k < sides; k++)
{
tris.Add(section + segment1 + k);
tris.Add(section + segment1 + k + 1);
tris.Add(section + segment2 + k);
tris.Add(section + segment1 + k + 1);
tris.Add(section + segment2 + k + 1);
tris.Add(section + segment2 + k);
}
}
}
helper.position = helperPos;
helper.rotation = helperRot;
// Create mesh from data and return it ================================================================================
Mesh mesh = new Mesh();
mesh.name = "SplineMesh (GENERATED)";
mesh.hideFlags = HideFlags.HideAndDontSave;
mesh.SetVertices(verts);
mesh.SetNormals(norms);
mesh.SetUVs(0, uvs);
mesh.SetTriangles(tris, 0);
return(mesh);
}
// Teardown function
public virtual void Teardown()
{
spline = null;
}
