Hi YTers, I am using my old scripts to do volume rendering with my gadget data. However with the new installed yt (3.2.1) it fails every time when I output the picture using: cam = ds.camera(c, [0.0, 0.0, 1.0], ds.domain_width, 1024, tf, fields=["density"], no_ghost=False)#, log_fields=[True]) ####### failed from here !!!###### im = cam.snapshot("../results/NOSN_NOZCOOL_L010N0256/rendering_%03d.png"%(snapshot),clip_ratio=4.0) The error is RuntimeError: Traceback (most recent call last): File "yt_rendering_parallel_simple.py", line 47, in <module> im = cam.snapshot("../results/NOSN_NOZCOOL_L010N0256/rendering_%03d.png"%(snapshot),clip_ratio=4.0) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 769, in snapshot self.initialize_source() File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 721, in initialize$ source self.no_ghost) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 180, in initialize_sourc$ self.set_fields(fields, log_fields, no_ghost) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 170, in set_fields for b in self.traverse(): File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 184, in traverse yield self.get_brick_data(node) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 271, in get_brick_data vcd = grid.get_vertex_centered_data(field, smoothed=True, no_ghost=self.no_ghost).astype('float64') File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.py", line 280, in get_vertex_centered_data cg = self.retrieve_ghost_zones(1, field, smoothed=smoothed) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.py", line 257, in retrieve_ghost_zones **kwargs) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/construction_data_containers.py", line 841, in __init$ _ YTCoveringGridBase.__init__(self, *args, **kwargs) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/construction_data_containers.py", line 517, in __init$ _ self.get_data(fields) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/construction_data_containers.py", line 600, in get_da$ a if len(fill) > 0: self._fill_fields(fill) File "/mnt/home/yqin/programs/yt-x86_64/src/yt-hg/yt/data_objects/construction_data_containers.py", line 879, in _fill_$ ields raise RuntimeError RuntimeError Am I missing something updated in the new yt code? Cheers, Yuxiang