public void RebuildMesh()
{
if (_mesh == null)
{
Debug.LogError("Mesh asset is missing.");
return;
}
_mesh.Clear();
// Build a icosphere and subdivide it.
IcosphereBuilder ib = new IcosphereBuilder();
for (var i = 0; i < _subdivision; i++) ib.Subdivide();
// Make vertex arrays.
var vc = ib.vertexCache;
var vcount = 3 * vc.triangles.Count;
var va1 = new List<Vector3>(vcount); // vertex position
var va2 = new List<Vector3>(vcount); // previous vertex position
var va3 = new List<Vector3>(vcount); // next vertex position
foreach (var t in vc.triangles)
{
var v1 = vc.vertices[t.i1];
var v2 = vc.vertices[t.i2];
var v3 = vc.vertices[t.i3];
va1.Add(v1);
va2.Add(v2);
va3.Add(v3);
va1.Add(v2);
va2.Add(v3);
va3.Add(v1);
va1.Add(v3);
va2.Add(v1);
va3.Add(v2);
}
// Rebuild the mesh asset.
_mesh.SetVertices(va1);
_mesh.SetUVs(0, va2);
_mesh.SetUVs(1, va3);
_mesh.SetIndices(
vc.MakeIndexArrayForFlatMesh(), MeshTopology.Triangles, 0);
_mesh.bounds = new Bounds(Vector3.zero, Vector3.one * 1000);
_mesh.Optimize();
_mesh.UploadMeshData(true);
}
void RebuildMesh()
{
if (_mesh) DestroyImmediate(_mesh);
// Make an icosphere.
IcosphereBuilder ib = new IcosphereBuilder();
for (var i = 0; i < _subdivision; i++) ib.Subdivide();
// Vertex array.
var vc = ib.vertexCache;
var vertices = new Vector3[vc.triangles.Count * 6];
var colors = new Color[vc.triangles.Count * 6];
// Make triangle scales.
var offs = 0;
foreach (var t in vc.triangles)
{
// Vertices on the original triangle.
var v1 = vc.vertices[t.i1];
var v2 = vc.vertices[t.i2];
var v3 = vc.vertices[t.i3];
// Get the center of mass and encode it to a color.
var cc = (v1 + v2 + v3) * 0.3333333f;
var c = new Color(cc.x, cc.y, cc.z, 1);
// Fill the color.
for (var i = 0; i < 6; i++)
colors[offs + i] = c;
// Make each face.
vertices[offs++] = v1;
vertices[offs++] = v2;
vertices[offs++] = v3;
vertices[offs++] = v3;
vertices[offs++] = v2;
vertices[offs++] = v1;
}
// Index array. Simply enumerates the vertices.
var indices = new int[vertices.Length];
for (var i = 0; i < indices.Length; i++)
indices[i] = i;
// Build a mesh.
_mesh = new Mesh();
_mesh.hideFlags = HideFlags.DontSave;
_mesh.bounds = new Bounds(Vector3.zero, Vector3.one * 10);
_mesh.vertices = vertices;
_mesh.colors = colors;
_mesh.SetIndices(indices, MeshTopology.Triangles, 0);
_mesh.RecalculateNormals();
_subdivided = _subdivision;
}
