Имитация 3D с помощью техники рейкастинга. Никакого OpenGL.
На видео:
стены;
пол/потолок, возможность установки разных текстур для секций пола/потолка;
туман;
спрайты (колонны, бочки, лампочки).
Всё это нужно серьёзно оптимизировать, чтобы оно выдавало годный FPS...
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