Windmill Fake 3D Code

var seperation = 1;
var height = 135;

if surface_exists(windmill)
    {
    surface_set_target(windmill)
    draw_clear_alpha(c_black,0)

    draw_sprite_ext(sprWindmillFan,0,67,67,1,1,image_angle,c_white,1)

    surface_reset_target()
    }
else
    {
    windmill = surface_create(135,135)
    }

for (var i = 0; i < height; i += 1)
    {
    var xx = x+(lengthdir_x(0, -global.renderangle) + lengthdir_x(-(z+i), -global.renderangle - 90));
    var yy = y+(lengthdir_y(0, -global.renderangle) + lengthdir_y(-(z+i), -global.renderangle - 90));

    var xdraw = xx+(lengthdir_x(0, dir) + lengthdir_x(-67, dir - 90));
    var ydraw = yy+(lengthdir_y(0, dir) + lengthdir_y(-67, dir - 90));
    if surface_exists(windmill)
        {
        draw_surface_general(windmill,135-i,0,1,135,xdraw,ydraw,image_xscale,image_yscale,dir,c_white,c_white,c_white,c_white,1);
        }
    }