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A shader-based software renderer written from scratch in C89

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Hey, this renderer is really a great job, I like the 3D and its algorithms (it's all illusions), and I personally made a simple one using pure javascript running on...

function `calculate_pan` in `camera.c`: ``` static vec3_t calculate_pan(vec3_t from_camera, motion_t motion) { vec3_t forward = vec3_normalize(from_camera); vec3_t left = vec3_cross(UP, forward); vec3_t up = vec3_cross(forward, left); float distance = vec3_length(from_camera);...