Hello,
I am attempting to create a series of volume rendered images of my simulation at different time steps so that I can compile them into a movie. I want to use the maximum intensity fragment shader, which I believe is only available in the yt interactive volume rendering with OpenGL (I've looked into simply using a maximum intensity projection, but this is only available on-axis). I would like to be able to take a screenshot of the OpenGL window created when I run the yt interactive volume rendering, but I'm having difficulty adding this feature to the volume rendering source code in my local yt directory. Below is the modification I’ve made to the code as well as a screenshot of the problem. I have no prior experience with OpenGL.
/yt/visualization/volume_
rendering/interactive_vr.py
846 def _retrieve_framebuffer(self):
847 ox, oy, width, height = GL. glGetIntegery(GL.GL_VIEWPORT)
848 + my_buffer = GL.glReadBuffer(GL.GL_FRONT)
849 - debug_buffer = GL.glReadPixels(0, 0, width, height, GL.GL_RGB, GL.GL_UNSIGNED_BYTE)
849 + debug_buffer = GL.glReadPixels(0, 0, width, height, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, my_buffer)
850 arr = np.fromstring(debug_buffer, “unit8”, count, width*height*3)
851 return arr.reshape((width, height, 3))
/yt/visualization/volume_
rendering/interactive_loop.py
187 def __call__(self, scene, camera, callbacks):
188 while not glfw.WindowShouldClose(self.
window) or self.should_quit: 189
callbacks(self.window) 190
if callbacks.draw: 191
camera.compute_matrices() 192
scene.set_camera(cameara) 193
scene.render() 194
glfw.SwapBuffers(self.window) 195
callbacks.draw = False 196 + arr = scene._retrieve_framebuffer()
197 +
write_bitmap(arr, “test.png”) 198
glfw.PollEvents() 199
yield self 200
glfw.Terminate() The simulation is a single rectangular box, but the screenshot I get with the above code is multiple boxes that look like they should be overlaid? Maybe there is a simpler method of accomplishing this? I'd appreciate any suggestions.Thanks,Nicole Melso--Nicole MelsoNSF Graduate Research FellowColumbia Astronomy Department
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