Initial commit: Speckle-Scanner 3D pipeline with setup README

05_disparity/libsgm/requirements.txt

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+# 05_disparity/libsgm — dependencies
+#
+# The Python pipeline runner (run_sgm_pipeline.py) uses only the standard library.
+# Disparity computation is done by the compiled stereosgm_new binary (CUDA C++).
+#
+# --- System build requirements (not installable via pip) ---
+#   - NVIDIA GPU with CUDA compute capability >= 3.5
+#   - CUDA Toolkit 11.x or 12.x
+#   - CMake >= 3.18
+#   - OpenCV (C++ headers + libs, for building libSGM samples)
+#
+# Build:
+#   cd ~/Speckle-Scanner/05_disparity/libsgm
+#   mkdir -p build && cd build
+#   cmake .. -DENABLE_SAMPLES=on
+#   make stereosgm_new -j4
+#
+# No pip packages required to run run_sgm_pipeline.py after the binary is built.