Add delete source button of cubemap after build

[AlexAPPi]

After loading 6 source 2D textures (faces ±X, ±Y, ±Z) and combining them into a single cubemap resource, the original 2D textures remain in memory and are not destroyed by the engine. This leads to data duplication: the same images are stored both as separate 2D textures and as cubemap faces.

It might be worth considering other techniques

[Maksims]

You can tick "exclude" on them.
Force deleting source files would be undesirable, as we often download back source files, especially when working in a team.

[AlexAPPi]

You can tick "exclude" on them. Force deleting source files would be undesirable, as we often download back source files, especially when working in a team.

exclude doesn't help because loading an image automatically creates a texture object. Try doing it yourself.

let texObjects = [];
let texTitles = [];
pc.app.graphicsDevice.textures.forEach(x => { texObjects.push(x); });
texObjects.sort((a, b) => a._gpuSize - b._gpuSize);
texObjects.forEach(x => { texTitles.push(x.name); });
texTitles

[Maksims]

I've just tested it: https://playcanvas.com/project/1506166/overview/model-viewer
You can apply prefiltered cubemap, mip 2+ and have faces unloaded. You can even switch to mip 1 at runtime, which will use highest resolution in prefiltered data, but not faces.
And if you use Mip 1, then it will load faces (unless they are excluded).

In all cases, VRAM is different. And when using only prefiltered cubemap without faces, then only single texture will be applied and little extra VRAM used for it (~2mb).

But I see the problem, which I believe that prefiltered cubemap should still work well even if faces are deleted/excluded. Which atm it does not if mip 1 is set at load time. But it allows to switch to mip 1 at runtime though.

Regardless, exclude - does exactly same as delete, because it does not even adds the assets information in assets list, Editor will treat them as "does not exist".