Corona Bitmap and Bitmap Screen problem.

[Tanakov]

I think someone already started similar conversation on Facebook group. but this is what I noticed lately.

So Mockup_1a is using standard Bitmap, Mockup_1b is using CoronaBitmap set to screen.

[Tanakov]

sorry for bumping, this was a mistaken post.

[Juraj]

Can Mods or Devs write if this is solved instead of just moving it to 'Resolved' ?

Lot of things get moved here if solution isn't possible or feasible in near future, so it's hard to know what does get solved without reading release notes constantly. Thanks

[maru]

I moved it here because it was described by OP as "mistaken post".

[Juraj]

I moved it here because it was described by OP as "mistaken post".

You misunderstood him, he accidentally bumped his post, only that reply was 'mistaken'.

Nothing mistaken about this bug :- ). I mentioned it in Skype chat too, but didn't have time to log it. I have a scene but too lazy..

CoronaBitmap Screen mode is the issue, and hopefully it doesn't manifest elsewhere..

[maru]

Oops! Moved back to bug reporting, sorry for the hassle.

So can you explain what exactly is happening here? How is the CBitmap in screen mode used?

[Juraj]

3dsMax 2016/Corona 1.6 hf.

The pretty version on the left is regular Max bitmap in directly visible slot.
The ugly version on the right is CoronaBitmap in directly visible slot.

Both times it's high-res (5k) jpeg. No form of filtering seems to affect it in any way.

I have scene that does it .zipped, but have no idea where that private uploader is.

[romullus]

Those two looks like completely different issues, isn't?

[Juraj]

Those two looks like completely different issues, isn't?

Could be, but why do you think so ?

I just named my 'wavyness' but you can see in both posts the difference is drastic reduction in quality when using CoronaBitmap.

And this is what it does in screen-space, hopefully it doesn't manifest when using inside material, though now I am worried.

[romullus]

I don't know how Tanakov's scene is setup, but the only noticeable difference in his examples is see through effect and slight change in lighting, but that could be expected if scene is set up in particular way. In your case is very clear that Corona Bitmap has some horrible issues.

[Juraj]

Damn, you are correct. I only focused on the less sampled result, which could just be poor AA and the real culprit of his is the translucency.

But this brings me to other issue I had with it which could be that one :- D Which is using screen-mapped Corona bitmap in reflection slot. But I don't remember that issue correctly and I think I didn't saved it.

[maru]

Anyway.... we need better explanations from OP.

[Tanakov]

Sorry for abandoning this thread for a while.

I have set the camera perspective to match the picture.
So as you can see on Mokup_A the scene somewhat looks fine with the light and stuff. I used Regular Bitmap set to screen mode as enviro, same map for background.
When I change Bitmap to CoronaBitmap and change it from Sphere to Screen mode, it instantly creates this "transparency" effect on all the objects in scene.


PS. Thanks Juraj for taking time to dig this out.

[romullus]

Just to be sure, you used bitmap (and CoronaBitmap) in screen mode as direct visibility override, not for reflections override nor as enviroment map for lighting, right?

[Tanakov]

Just to be sure, you used bitmap (and CoronaBitmap) in screen mode as direct visibility override, not for reflections override nor as enviroment map for lighting, right?

No, it was used as enviro map that partially lit the scene.