qlbm_trame.py

import os
import sys

# Configure VTK for headless rendering BEFORE any VTK imports
if os.environ.get("PORT") or os.environ.get("HF_PORT") or os.environ.get("SPACE_ID"):
    os.environ["MESA_GL_VERSION_OVERRIDE"] = "3.2"
    os.environ["MESA_GLSL_VERSION_OVERRIDE"] = "150"
    os.environ["GALLIUM_DRIVER"] = "llvmpipe"
    # Force VTK to use OSMesa for offscreen rendering
    os.environ["VTK_DEFAULT_EGL_DEVICE_INDEX"] = "-1"

# ...existing imports...