Interactive Explanation of the DDA Algorithm: Unraveling the Geometry Behind Raytracing

This interactive tutorial provides a clear and concise explanation of the Digital Differential Analyzer (DDA) algorithm, widely used in voxel raytracing. The author, drawing from personal experience, progressively derives the algorithm, demonstrating the entire process with editable code. From calculating the intersection points of a ray with a grid in 2D to extending it to 3D, the tutorial clearly explains the algorithm's principles and implementation details. Even beginners in geometric algorithms can easily grasp the elegance of the DDA algorithm.