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If you want to bypass Kitware's animtovtkhdf translation layer entirely, you can read OpenRadioss ANIM files directly into Python memory using Vortex-Radioss, an open-source Python library developed by the OpenRadioss community specifically for post-processing.

Vortex-Radioss unpacks the compressed binary/ASCII arrays inside A00x files into standard NumPy arrays. Once the data is in NumPy, it is straightforward to construct a native pyvista.UnstructuredGrid.

Step 1: Install Dependencies

Vortex-Radioss relies on lasso-python for CAE array handling.

pip install lasso-python

Based on my thorough study of the extracted source code from both animtod3plot and openradioss-to-vtkhdf, I now have a comprehensive understanding of the Radioss animation file format. Let me summarize what I've learned and provide you with a complete PyVista reader implementation.

Radioss Animation File Format Summary

The Radioss animation file (.anim) is a big-endian binary format containing:

File Header (Flags)

magic - file format version
time - simulation time for this state
Various text fields (time_text, mod_anim_text, radioss_run_text)

	Reading the log, the focus loss is caused by a second X window that maps at the same moment — not by the GIMP dialog itself.

	## What the log shows

	The GIMP "Open Image" dialog (`#x1e04e81`) maps and gets focus correctly:

	```
	[01:21:05] exwm-input--update-focus: Set focus on #x1e04e81
	```

	[01:21:00]exwm-input--on-buffer-list-update: current-buffer=#<buffer EXWM> selected-window=#<window 283 on EXWM>
	[01:21:00]exwm-layout--refresh: frame=#<frame editor 0x5f52fe6ecae0>
	[01:21:00]exwm-layout--refresh-workspace: Refresh workspace #<frame editor 0x5f52fe6ecae0>
	[01:21:00]exwm-layout--show: Show #x1e00087 in #<window 283 on EXWM>
	[01:21:00]exwm--set-geometry: Setting #x1e00087 to 954x1058+966+0
	[01:21:00]exwm-layout--set-state: id=#x1e00087
	[01:21:00]exwm-layout--set-client-list-stacking:
	[01:21:00]exwm-layout--refresh: frame=#<frame editor 0x5f52fe6ecae0>
	[01:21:00]exwm-layout--refresh-workspace: Refresh workspace #<frame editor 0x5f52fe6ecae0>
	[01:21:00]exwm-layout--show: Show #x1e00087 in #<window 283 on EXWM>

	"""PyVista adapter for AnimData → MultiBlock (UnstructuredGrid blocks).

	Adapted from vtkhdfwriter.py which wrote VTK-HDF5 format.
	This version outputs PyVista datasets.
	"""
	from typing import Any, Optional
	import numpy as np
	import os, re
	import pyvista as pv
	from .animstructs import AnimData

	direnv: export +CONDA_DEFAULT_ENV +CONDA_PREFIX +CONDA_SHLVL +GSETTINGS_SCHEMA_DIR +GSETTINGS_SCHEMA_DIR_CONDA_BACKUP +PIXI_ENVIRONMENT_NAME +PIXI_ENVIRONMENT_PLATFORMS +PIXI_EXE +PIXI_IN_SHELL +PIXI_PROJECT_MANIFEST +PIXI_PROJECT_NAME +PIXI_PROJECT_ROOT +PIXI_PROJECT_VERSION +PIXI_PROMPT +PROJ_DATA +PROJ_NETWORK +VIRTUAL_ENV +XML_CATALOG_FILES ~PATH ▪ preparing packages [━━━q@mypc:pyroll$
	direnv: loading ~/.dotfiles/home/config/pixi/pyroll/.envrc
	direnv: export +CONDA_DEFAULT_ENV +CONDA_PREFIX +CONDA_SHLVL +GSETTINGS_SCHEMA_DIR +GSETTINGS_SCHEMA_DIR_CONDA_BACKUP +PIXI_ENVIRONMENT_NAME +PIXI_ENVIRONMENT_PLATFORMS +PIXI_EXE +PIXI_IN_SHELL +PIXI_PROJECT_MANIFEST +PIXI_PROJECT_NAME +PIXI_PROJECT_ROOT +PIXI_PROJECT_VERSION +PIXI_PROMPT +PROJ_DATA +PROJ_NETWORK +VIRTUAL_ENV +XML_CATALOG_FILES ~PATH
	q@mypc:pyroll$

	import re
	import numpy as np
	import pandas as pd
	import matplotlib as mpl
	import matplotlib.pyplot as plt
	import pyroll.core
	import pyroll.pillar_model
	import pyroll.freiberg_flow_stress
	from pyroll.freiberg_flow_stress import FreibergFlowStressCoefficients
	# import pyroll.hill_spreading

	;;; hl-line-global.el --- highlight the current line -- lexical-binding:t --

	(defface hl-line
	'((t :inherit highlight :extend t))
	"Default face for highlighting the current line in Hl-Line mode.")

	(defvar hl-line-overlay-priority -50)

	(defvar-local hl-line-global-overlay nil)

	(require 'package)
	(setq package-check-signature nil)
	(package-initialize nil)
	(require 'use-package)
	(use-package compat)

	(use-package xelb
	:config
	;; (setq xcb:keysyms:auto-update nil)
	(setq xcb:connection-timeout 5))