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Unclear, when RenderTexture is rendered


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I have a few images, which i need to combine and then store the result. As i understood, RenderTexture is just what i need.

let provinceTexture = resources["province"].texture;
let baseProvinceSprite = new PIXI.Sprite(provinceTexture);
baseProvinceSprite.x = 0;
baseProvinceSprite.y = 0;
baseProvinceSprite.width = w;
baseProvinceSprite.height = h;

let terrainTexture = resources["grass"].texture;
let terrainSprite = new PIXI.TilingSprite(terrainTexture, w, h);
terrainSprite.mask = baseProvinceSprite;
terrainSprite.x = 0;
terrainSprite.y = 0;
terrainSprite.width = w;
terrainSprite.height = h;

let renderTexture = PIXI.RenderTexture.create({ width: w, height: h });
app.renderer.render(terrainSprite, { renderTexture: renderTexture });

"renderTexture" stores what i need. But i also want to remove sprites and textures i used to make this rendertexture.

If i just destroy them right after .render call, rendertexture is rendered as black texture on screen. It works, only if i destroy them after 1sec timeout, but it doesnt look like a good decision. I guess, i can destroy them only when rendertexture was rendered on screen, which happens later in the code.
So, how do i make this properly?

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