Clearing color from point clouds using RhinoCommon ClearColors in C#

Rhino Developer
5

Hey @dale I’m sorry that I have to dig this up but there still seems to be a lot wrong with PointCloud.ClearNormals(), PointCloud.ClearColors() and the setter for PointCloudItem.PointValue as well. I have adapted your test script from youtrack and it gives me the following results:

import Rhino
import scriptcontext as sc
from random import random as rnd

def test_clear_pointcloud_colors():
    filter = Rhino.DocObjects.ObjectType.PointSet
    rc, objref = Rhino.Input.RhinoGet.GetOneObject("Select pointcloud", False, filter)
    if not objref or rc != Rhino.Commands.Result.Success:
        return
    
    old_pointcloud = objref.PointCloud()
    if not old_pointcloud or not old_pointcloud.ContainsColors:
        return
        
    new_pointcloud = Rhino.Geometry.PointCloud(old_pointcloud)
    new_pointcloud.ClearColors()
    

    for i, p in enumerate(new_pointcloud):
        # this will not work
        p.PointValue = rnd()
        # this will work, but it will be impossible to get rid of the normals
        # without completely rebuilding the cloud
        p.Normal = Rhino.Geometry.Vector3d.Unset
    
    # this will print True
    print new_pointcloud.ContainsNormals
    
    # this will print True, regardless of ClearColors!
    print new_pointcloud.ContainsColors
    
    # attempt to clear the normals
    new_pointcloud.ClearNormals()
    
    # this will still print True, regardless of ClearNormals!
    print new_pointcloud.ContainsNormals
    
    # this will print False but should print True!
    print new_pointcloud.ContainsPointValues
    
    # this will now print False, since ClearNormals actually clears the colors!
    print new_pointcloud.ContainsColors
    
    sc.doc.Objects.Replace(objref, new_pointcloud)
    sc.doc.Views.Redraw()

if __name__ == "__main__":

I am also attaching your demo/test file to reproduce the errors:
colorful_pointcloud.3dm (43.5 KB)

This is under Rhino Version 7 SR8 (7.8.21196.5001, 2021-07-15)

A fix would be greatly appreciated since this really gets in the way when working with PointClouds :confused: