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Change background image?
Hi, I'm making a 2D game and I'm trying to change the scene background picture after I click on a hotspot. How would I be able to do that?
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Create a second background and use the Object: Set visibility Action to make your two backgrounds visible/invisible as required. Attach a Remember Visibility component to both so that changes will be saved.
You can swap out the visibility of two objects as above, but if it occupies the same space (as is the case of background sprites), then the most efficient way is to use a single background sprite and swap the sprite using animation. You can change a Sprite Renderer's Sprite field using an Animator Controller (see Unity's docs for more on this), and then manipulate it at runtime via AC's Object: Animate Action.
The game I am developing is technically probably as basic as it can get:
All you can see is static pictures of a room with things in it. (a bed, a hifi, a table, etc.).Within these pictures I create hotspots that changes the point of view in the room. For example:
You see a closet (closed). I create a hotspot on it. When the player clicks on it, the closet opens up. So far I do this by creating a new scene with the picture of the opened closet. The interaction is then accomplished by „scene > switch“.
So IF I got you right, Chris, then the way you described it is way more elegant and would also reduce the size of the actual game in Megabytes? The latter I ask because I was surprised that after running and exporting my dummy-game, I was ending up with 600 MB.
Picture 1: Closed closet being a hotspot.
Then I want the player to click this hotspot. After he or she did that, the player logically opened the closet and I want him to see the picture with the open closet.
I created an Animator Controller now. From here on I´m ... tadaa ... stuck for now.
This is how it looks like. See the two pictures I want to use for this action at the bottom.
The Object: Animate Action can either play animation clips by name, or adjust parameters set up in your Animator Controller. This is a Unity topic, but you can find more on this here.
However, you hadn't said before about the background being linked to a Hotspot, and presumably you'd want a different Hotspot to be interactive when the cupboard is opened. In this case, I'd say forget about swapping the background through animation, and just have them as two backgrounds side-by-side.
You can then assign a separate camera for each background (i.e. each background has a camera that looks at it), and then have the Hotspot Interaction use the Camera: Switch Action to just change the active camera. This would mean you could then also make a separate Hotspot for each background - so basically what you were doing before, but with each background side-by-side as opposed to separate scenes.
This won't affect the file size much, though. Scene files themselves take up very little space, and it's more down to the size of your assets. Compression, atlasing etc, are all factors that affect your game's size, and this again is an aspect of using Unity rather than AC - and you can find many good resources about this on Unity's documentation pages.
Any screenshots you can post of the scene setup will help to understand the problem.