That's what confused me. I read a post by ashley that states that things are only loaded from the active layout, but perhaps he means rendering surfaces, not objects. I love C2 but it's still new to me and I'm used to more conventional libraries like sdl/clanlib/impact/love
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As far as I understood it, in the webGL renderer, anything present in the layout view of the current layout has their textures loaded, if an object is created without his texture currently loaded, it will be loaded on the fly, then at the end of the layout, everything not needed anymore will be unloaded from memory.
That may be a wrong or incomplete interpretation, but basically: C2 is meant to take care of loading and unloading textures for you.