/// <summary>
/// Preform the first step of clipping, which is unpacking the mesh on the main thread
/// </summary>
/// <param name="mesh"></param>
/// <param name="clippingPlaneSet"></param>
/// <returns></returns>
private static Task <List <MeshPoly> > ClipUnpack(Mesh mesh, ClippingPlaneSet clippingPlaneSet, Matrix4x4 worldToMeshSpace)
{
List <MeshPoly> output = new List <MeshPoly>();
Vector3[] vertices = mesh.vertices;
Vector2[] uvs = mesh.uv;
int[] triangles = mesh.triangles;
Vector3[] normals = mesh.normals;
Vector4[] tangents = mesh.tangents;
Color[] colors = mesh.colors;
return(Task.Run(() =>
{
return ClipEachPolygonByEachClippingPlane(
ArrayToPolys(vertices, uvs, triangles, normals, tangents, colors),
clippingPlaneSet, worldToMeshSpace);
}));
}
/// <summary>
/// Clips each polygon to each clipping plane
/// </summary>
/// <param name="polys"></param>
/// <param name="clippingPlaneSet"></param>
/// <returns></returns>
private static List <MeshPoly> ClipEachPolygonByEachClippingPlane(
List <MeshPoly> polys,
ClippingPlaneSet clippingPlaneSet,
Matrix4x4 worldToMeshSpace)
{
try
{
foreach (var plane in clippingPlaneSet)
{
polys = ClipEachPolyByClippingPlane(polys, plane, worldToMeshSpace);
}
return(polys);
}
catch (Exception e)
{
MainThreadDispatcher.Dispatch(() => { Debug.LogError(e); });
throw e;
}
}
/// <summary>
/// Create a task to clip a new mesh.
/// </summary>
/// <param name="mesh"></param>
/// <param name="clippingPlaneSet"></param>
/// <param name="source"></param>
/// <returns></returns>
public static Task <Mesh> Clip(Mesh mesh, ClippingPlaneSet clippingPlaneSet, Matrix4x4 worldToMeshSpace, Mesh source = null)
{
return(ClipUnpack(mesh, clippingPlaneSet, worldToMeshSpace).ThenOnMainThread((x) => MeshPoly.ContructMesh(x, source)));
}