[solved] Known Problems with Corona 4 and "real world scale" ?

[Hilmar]

Hi
I tried to Setup a new material and used Maps in real world scale with the correct sizes for height and witdh. In the Bitmapnode it Looks ok, but as soon as I nudle em into a MIX or Composite node, the preview seems to be scaled in a wirred way.    After reloading the Material, the Bitmap nodes as well look wrong in small size preview, but in bigger size they are Looking ok again (Marked in blue).
And as you can see at the Image, the Material Previewball itself Looks wirred as well.

Any idea?
I use MAX 19 and did no update. It worked fine till I istalled Corona4 last week, so it might be something with this?
Maybe you have heared About this and could give me a hint how to solve this issue.
Thanks in Advance.
Hilmar

[romullus]

AFAIK, this is max's issue and Corona has nothing to do with it. It's always worked didn't work like that.

[Hilmar]

YES Romullus
you´re right!
 
I tried the same in an old Corona, MentalRay and scanline, facing the same problem.

But how do YOU work with this? Is there a workaround? Or shouldnt I use "realWorldScale" ? With this wirred preview, I cant use em for a library.
For example the Arroway Textures. A concrete wall is given with the overall size. So to use it in the same scale, I would choose "rws". Is that wrong?
Otherwise it is only eyeballing.

Thanks in advance for any help.

[romullus]

I never use material editor previews for anything but quick identifying what material/map i'm working with. Same goes for viewport representation. I always work with materials directly in render (in case of Corona, it's interactive render). For me, bugged material editor previews aren't big issue.

[maru]

Just to clarify how RWS materials should be used: https://forum.corona-renderer.com/index.php?topic=20616.0

The material editor preview may sometimes look "incorrect" when using RWS because the preview object has a specific scale. For example, if you plug a Corona Bitmap into diffuse, enable RWS and set its size to 200 cm x 200 cm - it should look good in the preview. If you set it to 1 cm x 1 cm you will end up with uniform color, because the texture will be tiled a lot of times.
It is the same if you do not use RWS - the texture will appear different when tiling is set to 1x1, 0.1x0.1 or 100x100.