coloring point using pointcolors

[smoothumut]

Hi Marco, I have struggling with coloring points using vedo. I have changed your example like below in order to use point colors and it looks it have a problem. I couldnt figure out what the problem is eventhough I checked pointcolors definitions in your pointcloud class. somehow it doesnt figure out after first assignment

the code is here

  """Colorize a mesh cell by clicking on it"""
  from vedo import Mesh, Plotter, dataurl

  # Define the callback function to change the color of the clicked cell to red
  def func(evt):
      msh = evt.actor
      if not msh:
          return
      pt = evt.picked3d
      # idcell = msh.closest_point(pt, return_cell_id=True)
      # m.cellcolors[idcell] = [255,0,0,255] #RGBA 
      idpoint = msh.closest_point(pt,return_point_id=True)
      m.pointcolors[idpoint] = [255,0,0,255]

  # Load a 3D mesh of a panther from a file and set its color to blue
  m = Mesh(dataurl + "panther.stl").c("blue7")

  # Make the mesh opaque and set its line width to 1
  # m.force_opaque().linewidth(1)

  # Create a Plotter object and add the callback function to it
  plt = Plotter()
  plt.add_callback("mouse click", func)

  # Display the mesh with the Plotter object and the docstring
  plt.show(m, __doc__, axes=1).close()

thanks in advance

[marcomusy]

Sorry for the late reply, this really looks like a bug... but I could not spot the problem for now. A workaround is to add m.pointdata.remove("PointsRGBA") m.pointcolors[idpoint] = [255,0,0,255]

On Mon, 31 Jul 2023 at 15:10, smoothumut @.***> wrote:

Hi Marco, I have struggling with coloring points using vedo. I have changed your example like below in order to use point colors and it looks it have a problem. I couldnt figure out what the problem is eventhough I checked pointcolors definitions in your pointcloud class. somehow it doesnt figure out after first assignment

the code is here

"""Colorize a mesh cell by clicking on it""" from vedo import Mesh, Plotter, dataurl

Define the callback function to change the color of the clicked cell to red

def func(evt): msh = evt.actor if not msh: return pt = evt.picked3d

idcell = msh.closest_point(pt, return_cell_id=True)

  # m.cellcolors[idcell] = [255,0,0,255] #RGBA
  idpoint = msh.closest_point(pt,return_point_id=True)
  m.pointcolors[idpoint] = [255,0,0,255]

Load a 3D mesh of a panther from a file and set its color to blue

m = Mesh(dataurl + "panther.stl").c("blue7")

Make the mesh opaque and set its line width to 1

m.force_opaque().linewidth(1)

Create a Plotter object and add the callback function to it

plt = Plotter() plt.add_callback("mouse click", func)

Display the mesh with the Plotter object and the docstring

plt.show(m, doc, axes=1).close()

thanks in advance

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[smoothumut]

Thanks a lot Marco, I have worked with cellcolors instead of pointcolors this time. But If I need to use pointcolors, I will definitely use this workaround, thanks a lot again and have a good day Best Regards