Version 1: Send out rays and return after getting the color of the intersected object. Solid-colored objects will be obtained.

Version 2: Add light sources. At this time, the spheres are no longer solid-colored. Add light sources one by one.

Version 3: Specular reflection effect.

Version 4: Add shadow effect.

Version 5: Mirror within mirror effect.

Version 6: Change the position and orientation of the camera.

Version 1: Draw a straight line based on a linear function.

Version 2: Optimize and improve drawing methods.

Draw a solid-colored triangle and fill the triangle with horizontally line segments.

Draw a gradient-colored triangle. Based on the line segment interpolation, the color is also interpolated.

Perspective Projection.

A cube made of triangular wireframe.

Add a model copy.

Transform the model and camera.

Clipping: saving computational resources by discarding and splitting triangles.

Adding depth testing.

Remove faces with their back faces facing us to reduce drawing.

Shadowing.

Texture Mapping.