How to make the titlescreen image change upon route completion?

[coffeecheesecake]

I have a "true ending" defined in my script as persistent.final, and two main menu images in my images folder, main_menu.png and main_menu_true.png.

I want to make it so that if persistent.final is true, the main menu image will change from main_menu to main_menu_true.png.

Here's what I currently have in my script, at the end of the "true ending":

$persistent.final = True
$persistent.main = "gui/main_menu_true.png"

And here's what I currently have in gui.rpy:

## Main and Game Menus #########################################################

## The images used for the main and game menus.
default persistent.main = "gui/main_menu_true.png"
image mainMenu = "[persistent.main]"
define gui.main_menu_background = "main_menu"
define gui.game_menu_background = "gui/game_menu.png"

However, the only image that manifests, regardless of how many endings are unlocked, is main_menu.png. Where am I going wrong?

Thanks!

[jeffster]

The actual place where Main Menu image is set see in "screens.rpy".
"gui.rpy" only sets default values.

In "screens.rpy", the standard script is

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screen main_menu():

    ## This ensures that any other menu screen is replaced.
    tag menu

    add gui.main_menu_background

Make it something like

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    add persistent.main_menu_bg

and in the script

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default persistent.main_menu_bg = gui.main_menu_background

#...
label true_ending_finish:
    $ persistent.main_menu_bg = "gui/main_menu_true.png"

PS. Also note that "define" set something constant. For values that could be changed use "default".
And check the variable names in your code: "mainMenu" is not "main_menu".