Perspective projection

How it works?

In my project I used 5 functions:

• 2D to 3D conversion
• rotate x, y, z
• drawing

2D to 3D conversion

For this function I used this formula:

x / (z * tan(angle / 2))
Where:
x - cordinate (I can use y also)
z - z cordinate
angle - it's a field of view (FOV)

tan() function is tangent

rotating (x, y and z)

To rotate shapes in 3D space, I used a rotation matrix

θ - How much angle do we turn
sin and cos - sine and cosine

By multiplying the coordinate matrix [x, y, z] (1 by 3) I get the values ​​that I use in the drawing

Drawing

In this function I check which button was pressed and use the rotation functions according to the button.
Next, I first draw the vertices and then the edges of the shapes.
The rendering function is in an infinite loop, so it updates endlessly.

You can rotate shapes and create your own using vertex lists