docs: add pyvista example with mapper input issue

Author: jourdain

examples/pyvista/issue-33.py

@@ -0,0 +1,78 @@
+# import os
+import pyvista as pv
+from pyvista import examples
+
+from trame.app import get_server
+from trame.ui.html import DivLayout
+from trame.widgets import html, client, vtk as vtk_widgets
+from trame_vtklocal.widgets import vtklocal
+
+WASM = True  # "USE_WASM" in os.environ
+save_ok = False
+save_ko = False
+
+# -----------------------------------------------------------------------------
+p = pv.Plotter()
+p.ren_win.OffScreenRenderingOn()
+
+
+def setup_pyvista():
+    p.show_axes()
+    widgets = [r.axes_widget for r in p.renderers if hasattr(r, "axes_widget")]
+    # p.ren_win.OffScreenRenderingOn()
+
+    return p.ren_win, widgets
+
+
+# -----------------------------------------------------------------------------
+
+
+class TrameApp:
+    def __init__(self, server=None):
+        self.server = get_server(server, client_type="vue3")
+        self.render_window, self.widgets = setup_pyvista()
+        self.html_view = None
+        self.ui = self._ui()
+        if save_ok:
+            self.add_mesh()
+            self.html_view.update()
+            self.html_view.save("/Users/sebastien.jourdain/Desktop/scene_ok.zip")
+
+    def add_mesh(self):
+        mesh = examples.download_st_helens()
+        warped = mesh.warp_by_scalar("Elevation")
+        surf = warped.extract_surface().triangulate()
+        surf = surf.decimate_pro(0.75)  # reduce the density of the mesh by 75%
+        p.add_mesh(surf, cmap="gist_earth")
+        p.reset_camera()
+        if self.html_view:
+            self.html_view.update()
+            if save_ko:
+                self.html_view.save("/Users/sebastien.jourdain/Desktop/scene.zip")
+
+    def _ui(self):
+        with DivLayout(self.server) as layout:
+            html.Button(
+                "Add Mesh",
+                click=self.add_mesh,
+                style={"position": "absolute", "z-index": 999},
+            )
+            client.Style("body { margin: 0; }")
+            with html.Div(
+                style="position: absolute; left: 0; top: 0; width: 100vw; height: 100vh;"
+            ):
+                if WASM:
+                    self.html_view = vtklocal.LocalView(self.render_window)
+                else:
+                    self.html_view = vtk_widgets.VtkRemoteView(
+                        self.render_window, interactive_ratio=1
+                    )
+
+        return layout
+
+
+# -----------------------------------------------------------------------------
+
+if __name__ == "__main__":
+    app = TrameApp()
+    app.server.start()