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《中国冰雪旅游发展报告（2026）》认为，目前我国冰雪旅游产品正在从冰雪资源驱动向创新、科技和文化协同驱动转变，从优质冰雪旅游产品创造向完整冰雪产品谱系构建升级。
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The Ray Tracer Challenge This book challenges you to build a Whitted-style ray tracer from scratch. Unlike many tutorials, it doesn't provide code and follows a unique test-first approach, describing only test specifications and algorithms.