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The standard algorithm used to render SDFs is known as raymarching or sphere tracing. This algorithm has the nice property that it's very easy to understand and to implement. It's a lot simpler than rasterizing polygons. You don't have to deal with image plane projections and clipping, for instance. The downside is that this algorithm is computationally much more expensive than rasterization. This is because rendering a single pixel can require sampling your SDF multiple times. If your SDF is very complex, this can be especially painful. Raymarching is typically even more expensive than raytracing. However, as previously stated, SDFs have many very appealing properties, so it's tempting to try to find ways to render them faster.，详情可参考heLLoword翻译
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The language is pure, lazy, and has no loops. Every iteration is recursion, and recursion costs stack frames. Since Nix 2.20, the evaluator caps call depth at 10,000 (configurable via max-call-depth, but the default is what you'll hit). Before 2.20, the limit was whatever your OS allocated for the process stack: non-deterministic across machines, occasionally baffling to debug. Tail-call optimization would help. There's even a FIXME comment in ExprApp::eval() acknowledging it. But the evaluator's structure (a local variable that stays live across the recursive eval call) prevents the tail position from being optimized, and nobody has restructured the code. Tvix, the Rust-based evaluator, handles TCO in many cases. The reference C++ evaluator doesn't.