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If a texture has white in it, then I need to darken the whole texture. Right?
But why should I darken the texture that has white in it, together with all the other colors in the texture, and not all other textures in the scene, that don't have such bright colors, at the same rate?
If you could send us any random scene where this consistently happens to you
You can use Corona converter to quickly convert standard 3ds Max bitmaps to CoronaBitmaps.
The heavier the scene the better.
Isn't this the other way round with this specific issue? I think complex scenes where background takes relatively small portion in terms of calculation time, are not affected as much as lightweight scenes, particularly single object renderings against monotone background.
Regarding the black background slowdown - I was able to find a report for Cinema 4D and it's scheduled to be investigated (fixing it based on a C4D report would also fix it for 3ds Max). Of course we can log additional reports with additional files, so if you have an example or simple reproduction steps, please do share them.
"Scene rendering longer on a black background" - The link points to a thread where the issue was related to using the noise limit. Can you confirm that everything is working as expected with pass or time limit? That is, the render time is higher when using noise limit only, and when using pass limit or time limit, there is no performance drop when using a black background.
Hi,
Aren't you able to to the premultiplication of the Alpha in the compositing software?
Corona provide the alpha channel data, given you save in the corresponding format, which you can use anyway you want, if the software lets it.
How exactly are you using the black backdrop?
There is no way it should double the render times. You can simply use it as environment overrides, e.g. for direct visibility (background) in the Render Settings > Scene tab.
This is already logged in our system and might be done Corona 12.
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