Medium data structure and algorithm practice puzzle.
Given a point in clip space as [x, y, z, w], return [x / w, y / w, z / w], rounded to 4 decimals. The projection step stores depth in w, so dividing by it makes faraway things smaller. This one division is the moment a 3D scene turns into a 2D picture.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Frame Heatmap, a pipeline you can run and download. See every Software Engineer project.
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