hook vtk directly

kglobe.py

@@ -146,7 +146,7 @@ async def main():
         plotter.add_mesh(line, color="red", line_width=2)
 
 
-    #kitty.hide_cursor()
+    kitty.hide_cursor()
     try:
         #asyncio.run(plotter.run())
         await plotter.run()

terminalplotter.py

@@ -5,6 +5,11 @@ import select
 import sys
 import termios
 import tty
+import vtk
+from vtk.util import numpy_support
+import numpy as np
+from io import BytesIO
+from PIL import Image
 
 import pyvista as pv
 
@@ -17,13 +22,14 @@ class TerminalPlotter(pv.Plotter):
         self.width = width
         self.height = height
         self._running = True
-        self._needs_render = True
-        self._render_complete = False
-        self._rendering = False
-        self._render_pending = True 
+        self.w2i_filter = vtk.vtkWindowToImageFilter()
+        self.w2i_filter.SetInputBufferTypeToRGBA()
+        self.w2i_filter.ReadFrontBufferOff()
+        self.w2i_filter.SetInput(self.ren_win)
         self.set_background([0.0, 0.0, 0.0])
-        self.add_on_render_callback(self._on_render)
-        # if we are too close to the bottom of the terminal, create some space.
+        # transparency
+        self.ren_win.SetAlphaBitPlanes(1)
+        self.ren_win.SetMultiSamples(0)
 
     async def initialize(self):
         h_pix, _ = await kitty.get_terminal_cell_size()
@@ -38,14 +44,15 @@ class TerminalPlotter(pv.Plotter):
             print("\n" * self.needed_lines, end="")
             kitty.set_position(self.start_y, self.start_x)
 
-
-    async def render_to_kitty(self):
-        self.render()
-        buf = io.BytesIO()
-        self.screenshot(buf, transparent_background=True, window_size=(self.width, self.height))
-        await kitty.draw_to_terminal(buf)
-        # print("y:", self.start_y, "rows:", self.rows, end="")
-        kitty.set_position(self.start_y, self.start_x)
+    async def _handle_key(self, c):
+        if c == "a":
+            self.camera.Azimuth(10)
+        elif c == "d":
+            self.camera.Azimuth(-10)
+        elif c == "w":
+            self.camera.Elevation(10)
+        elif c == "s":
+            self.camera.Elevation(-10)
 
     async def _input_loop(self):
         fd = sys.stdin.fileno()
@@ -64,60 +71,37 @@ class TerminalPlotter(pv.Plotter):
         finally:
             termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
 
-    async def _handle_key(self, c):
-        if c == "a":
-            self.camera.Azimuth(10)
-        elif c == "d":
-            self.camera.Azimuth(-10)
-        elif c == "w":
-            self.camera.Elevation(10)
-        elif c == "s":
-            self.camera.Elevation(-10)
-        self._needs_render = True
-        # await self.render_to_kitty()
-
-    def _on_render(self, *args):
-        """Callback that runs after each render."""
-        self._rendering = False
-        self._render_complete = True
-
-    async def _display_loop(self):
-        """Loop that captures the screen and updates the terminal after rendering."""
-        while self._running:
-            if self._render_complete:
-                self._render_complete = False
-                buf = io.BytesIO()
-                # Safe: Screenshot only after render is confirmed complete
-                self.screenshot(buf, transparent_background=True, window_size=(self.width, self.height))
-                await kitty.draw_to_terminal(buf)
-                kitty.set_position(self.start_y, self.start_x)
-            await asyncio.sleep(0.001)
-
     async def _render_loop(self):
         while self._running:
-            if self._needs_render and not self._rendering:
-                self._rendering = True
-                self._needs_render = False
-                self.update()  # triggers a render and calls _on_render
-            await asyncio.sleep(0.001)
+            # keep renedring the scene
+            self.ren_win.Render()
+            # Update the filter to grab the current buffer
+            self.w2i_filter.Modified()
+            self.w2i_filter.Update()
 
-    async def _display_in_terminal(self, buf):
-        await kitty.draw_to_terminal(buf)
-        kitty.set_position(self.start_y, self.start_x)
+            vtk_image = self.w2i_filter.GetOutput()
 
+            width, height, _ = vtk_image.GetDimensions()
+            vtk_array = vtk_image.GetPointData().GetScalars()
+            arr = numpy_support.vtk_to_numpy(vtk_array)
+
+            # Reshape the array to height x width x channels (probably 3 or 4)
+            arr = arr.reshape(height, width, -1)
+
+            # Flip vertically because VTK's origin is bottom-left
+            arr = np.flip(arr, axis=0)
+            img = Image.fromarray(arr)
+            buffer: BytesIO = BytesIO()
+            img.save(buffer, format="PNG")
+            await kitty.draw_to_terminal(buffer)
+            kitty.set_position(self.start_y, self.start_x)
 
     async def run(self):
         await self.initialize()
         self.iren.initialize()
-        self._needs_render = True
         tasks = [
             asyncio.create_task(self._input_loop()),
             asyncio.create_task(self._render_loop()),
-            asyncio.create_task(self._display_loop()),
         ]
         await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
         self._running = False
-
-
-        #await self.render_to_kitty()
-        #await self._input_loop()