So, in this 3D renderer, I managed to make the points and triangles work properly, but I can't really get angle to work out.

Anyone who already made a 3D renderer can help me out?

import math

def rotate(origin, point, angle):
    """
    Rotate a point counterclockwise by a given angle around a given origin.

    The angle should be given in radians.
    """
    ox, oy = origin
    px, py = point

    qx = ox + math.cos(angle) * (px - ox) - math.sin(angle) * (py - oy)
    qy = oy + math.sin(angle) * (px - ox) + math.cos(angle) * (py - oy)
    return qx, qy

            if event.type == pygame.MOUSEMOTION:
                for point in self.point_list:
                    point.x = objects.rotate((self.player_x, self.player_y), (point.x, point.y), event.pos[0])[0]
                    point.y = objects.rotate((self.player_x, self.player_y), (point.x, point.y), event.pos[1])[1]
                    point.z = objects.rotate((self.player_z, self.player_y), (point.z, point.y), event.pos[0])[0]
                    print(objects.rotate((self.player_x, self.player_y), (point.x, point.y), event.pos[0])[0])
                    #pygame.mouse.set_pos(400, 400)  

        self.last_time_mouse_moved = int(pygame.mouse.get_pos()[0]), int(pygame.mouse.get_pos()[1])