Prism Rendering

In this project, I applied some basic linear algebra concepts that I just learnt to implement a simple 3D render of a prism.

Method Overview

The method used to display and animate a 3D object is simple:

1. Declare the vertices of the 3D object (in homogeneous coordinates),
2. Define the faces by listing which vertices form each face,
3. Apply a rotation transformation to spin the object around its center,
4. Translate the object along the Z-axis to place it inside the viewable frustum,
5. Apply a perspective projection to simulate depth,
6. Convert the projected coordinates from normalized device space to window space (screen scaling),
7. Draw the edges by connecting the vertices according to the face definitions,
8. Display the current buffer onto the screen,
9. Update the rotation angle and repeat the whole process for the next frame.

Build & Run

No optimizations

cargo run

Optimized

cargo run --release

You can change the prism's rotation speed directly in main.rs:

// Rotation speed
const THETA_ITERS: f32 = 0.01;

File Overview

Functions

• main → main loop and variable initializations
• dot_product → single point precision matrix multiplication
• draw_line → given two points it draws a line in a 2D matrix
• draw → draws the pixels in the window buffer

License

MIT