feat: add triangle mesh ray tracing + terminal viewer tool#9
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Major additions: - Image class: PBRT Film-style pixel buffer with sample accumulation, tone mapping (to_rgba8), progress tracking, dirty notification - Image I/O: PPM (always), EXR (optional -Dexr=true), PNG (-Dpng=true) with stub fallbacks when optional deps are disabled - TriangleMesh geometry: Moller-Trumbore intersection, precomputed face normals, AABB bounding box (linear scan, no BVH yet) - Camera headlight shading: abs(N.dot(view_dir)) diffuse look - art_term CLI tool: loads mesh via quiver, ray-traces with auto-framed camera, outputs to terminal via balsa::terminal (Kitty/half-block) Build system changes: - quiver is now a required dependency (mesh I/O and topology) - balsa is an optional dependency gated behind -Dviewer=true - Fixed zipper transform umbrella header include (transform.hpp -> all.hpp) - Fixed spdlog/fmt define conflict by building spdlog as static - exr.cpp/png.cpp always compiled (stubs when deps absent)
Meson creates wrap-redirect files in subprojects/ when resolving transitive dependencies (quiver->fmt/mshio/sol2/lua, balsa->eigen/ cli11/nlohmann_json, zipper->mdspan). These are build artifacts that should not be committed.
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Summary
-Dexr=true/-Dpng=true)art_termCLI tool: loads mesh via quiver, ray-traces with auto-framed camera, outputs to terminalDependencies
-Dviewer=true(terminal output)balsa::terminal::emit_auto()Build
Fixes included
zipper/transform/transform.hpp->zipper/transform/all.hpp(renamed upstream)exr.cpp/png.cppalways compiled with stub fallbacks when optional deps are absentKnown limitations