Coloration abnormalities

[Bobosaver]

I want to color my VTK image.If I key "plotter.show()", it did great.But in stpyvista , there is an abnormality in the color.

[edsaac]

I noticed that and it seems like a regression on the latest version of panel. Setting its version to panel==1.3.8 should work for now.

[Bobosaver]

Thanks, problem solved. I set panel==1.3.2，It shows the right thing too.,But panel==1.4.0 may occur error. Thanks for your answer.

[Bobosaver]

But, a new error occur. it can not show my VTk, just a output word.

[edsaac]

I have seen that occasionally when running Python<=3.9, and it is part of the reason Python >= 3.10 is recommended. What version of Python are you running?

[Bobosaver]

I use anaconda ,and my python==3.10.13. And I met another problem, after I upgrade my python to 3.11.7 ,
def plot_orthogonal(mesh,size,u,v,w):
slices = mesh.slice_orthogonal(x=u, y=v, z=w)
plotter = pv.Plotter(window_size=size)
plotter.add_mesh(slices,cmap="jet")
plotter.background_color = "white"
# plotter.camera.zoom('tight')
# plotter.view_isometric()
return plotter

web can not show vtk_slice（but Overall vtk show right).

[edsaac]

slices = mesh.slice_orthogonal(x=u, y=v, z=w)

slice_orthogonal returns a pv.MultiBlock object, which is basically a bundle of meshes. Iterating over the MultiBlock and adding each mesh individually to the plotter will do the trick.

---

This is a nice example that could go in the Discussion section in this repo.

import pyvista as pv
from pyvista import examples
import streamlit as st
from stpyvista import stpyvista

pv.start_xvfb()

mesh = examples.load_channels()
add_mesh_kwargs = dict(cmap="copper", ambient=0.5)

## App layout
st.title("🍕 Slices & stpyvista")
cols = st.columns(2)

with cols[0]:
    "## Full 3D model"
    pl = pv.Plotter()
    pl.window_size = [300, 300]
    pl.add_mesh(mesh, **add_mesh_kwargs)
    pl.add_axes()
    pl.view_isometric()

    stpyvista(pl)

with cols[1]:
    "## Orthogonal slices"
    slices = mesh.slice_orthogonal(x=50, y=50, z=30)
    slices_pl = pv.Plotter()
    slices_pl.window_size = [300, 300]

    for slice in slices:
        slices_pl.add_mesh(slice, **add_mesh_kwargs)

    slices_pl.add_axes()
    slices_pl.view_isometric()
    stpyvista(slices_pl)

[Bobosaver]

thanks anyway,I will try it.

[edsaac]

Updating to panel>=1.4.1 will solve the colormap issue.

holoviz/panel#6627