Using this function you can change the sprite resource assigned to a given sprite element on a layer. You give the sprite element ID (which you get when you create a sprite element using layer_sprite_create() or when you use the function layer_sprite_get_id()), and then supply a sprite index element asset will be changed. Note that if the sprite has sub-images then it will animate too (this can be controlled using the layer_sprite_index and layer_sprite_speed functions). Note that you can assign a value of -1 as the new sprite index and no sprite will be shown, although the element will still exist and can still be changed again later.
Argument Description sprite_element_id The unique ID value of the sprite element to change sprite_index The new sprite index to use
var s = layer_sprite_get_id(layer,
if layer_sprite_get_sprite(s) != spr_Nighttime
The above code checks the sprite index of the element with the ID stored in the global variable global.Asset_sprite and if it is not "spr_Nighttime" then that sprite is assigned to the element.