runette
commented
9 months ago Hi @leorid
Firstly - an apology. In the most recent versions I changed the ABI to make the package considerably faster but it looks like I forgot to update the example code! Sorry. I will get around to doing that ASAP.
Be assured that this package is the way to do what you want (I think).
Some notes:
PDAL supports two general types of data held in views:
- Point Coud Views. These are what you will get from reading e.g. .ptx files (see ). Views have position (x,y,z) and colour or other data but do NOT have normals (normals not making much sense for point clouds - all directions are normal to a point). I think this is in conformance with the underlying ptx data and is what PDAL supplies!
The easiest way in this package to access the point cloud data as positions and colour is to do the following
using (PointViewIterator views = pl.Views) {
views.Reset();
while (views.HasNext())
{
PointView view = views.Next;
if (view != null)
{
Console.WriteLine($"Point Count is {view.Size}");
BakedPointCloud features = await BakedPointCloud.Initialize(view);and example of real use is here. This is, obviously, a lot more complicated than the example.
The BakedPointCloud structure is a part of this package and so is not an extension. It can be seen here. It can be seen that the class contains the data as two Texture2D properties - one contains the point position (x,y,z which is saved in the Texture2D as RGBAFloat but don't be fooled - it is position data and not colour data) and colour (r,g,b as RGBA32 ).
Texture2D is a very efficient way of managing very large datasets (I have used this up to about 10 million points ) and is designed to be passed directly to VFX / shader for rendering. However - if you want the data as a list - the easiest way is to use this function and then call GetPixels on the Texture2D - or GetRawTextureData that gets a NativeArray and is much more efficient.
- Mesh Views. These are created by mesh generating filters in PDAL like filters.delaunay. This data has points, colours and faces (I can't remember if it comes with normals - check the PDAL documentation).
Mesh data can be accessed using a BakedMesh object which is created in almost the same way
using (PointViewIterator views = pl.Views) {
views.Reset();
while (views.HasNext())
{
PointView view = views.Next;
if (view != null)
{
Console.WriteLine($"Point Count is {view.Size}");
BakedMesh features = await BakedMesh.Initialize(view);The Mesh data is held in a DMesh3 property in the BakedMesh - this is a class defined in the Geometry3sharp library and provides the ability to manipulate the mesh.
I will try to update the docs soon
leorid
When trying to use the example-code it says that on the line
BpcData pc = view.GetBakedPointCloud();theGetBakedPointCloudmethod wasn't found. Is this an extension?What does
GetPackedMeshreturn? How to useGetAllPackedPoints? To use the method, aDimTypeListis required, which I could create, but it requests an IntPtr and I've no idea where I should get this?All I want to do is to read various file formats (ptx, maybe e57, maybe laz) and just get all the points, normals, colors as Vector3 or floats into a list.
How to do that with this package? Are there any examples I've missed?