Fix installation issues in setup.sh

[bearstonem]

Summary

This PR fixes several critical installation issues in the setup.sh script that prevent successful installation of TRELLIS.2 dependencies.

Issues Fixed

1. CUDA Linker Errors

Problem: Build fails with ld: cannot find -lcuda: No such file or directory when compiling nvdiffrec and cumesh
Solution:

• Added proper LIBRARY_PATH and LDFLAGS configuration to include system library paths
• Includes both /usr/lib/x86_64-linux-gnu and CUDA stubs directory

2. Git Submodule SSH Authentication Failures

Problem: CuMesh submodule clone fails with Permission denied (publickey) error
Solution:

• Automatically convert git submodule URLs from SSH to HTTPS
• Sync and initialize submodules after URL conversion

3. CUDA_HOME Not Set

Problem: Script assumes CUDA_HOME is set, causing issues when it's not
Solution:

• Added auto-detection logic with fallback to common CUDA paths
• Tries /usr/local/cuda-12.4 first, then /usr/local/cuda
• Provides helpful warning messages if detection fails

4. o-voxel Dependency Conflicts

Problem: o-voxel tries to reinstall cumesh and flex_gemm from git, causing failures
Solution:

• Modified pyproject.toml to use already-installed packages
• Prevents redundant git installations

Changes Made

setup.sh

• Added CUDA_HOME auto-detection (lines 69-87)
• Fixed nvdiffrec installation with proper library paths (lines 135-137)
• Fixed CuMesh submodule SSH issues (lines 156-160)
• Fixed o-voxel dependency conflicts (lines 178-181)
• Added informative logging throughout installation process

README.md

• Added documentation about CUDA path auto-configuration
• Added troubleshooting notes for common linker issues
• Documented SSH to HTTPS conversion behavior

Testing

Tested on Ubuntu with:

• CUDA 12.4 and 12.9 installations
• Multiple CUDA toolkit versions present
• Fresh installation without CUDA_HOME set

All packages now install successfully without manual intervention.

Related Issues

This addresses installation failures that users commonly encounter when following the setup instructions, particularly on systems with:

• Multiple CUDA versions installed
• No SSH keys configured for GitHub
• Standard Linux library paths for NVIDIA drivers

[alexmolskiy]

Need to add --no-build-isolation to line 89 pip install flash-attn==2.7.3

[bearstonem]

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[ben-mkiv]

FYI, gentoo seems to put cuda to /opt/cuda which is likely also a very reasonable path if people install it manually, so maybe you can add that

[bearstonem]

looks good