Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: kino_unico on 2021-08-05, 18:17:42

Title: problem propagate masks
Post by: kino_unico on 2021-08-05, 18:17:42

Hi, I don't know if this is a problem or if I just don't understand how this should work,
I have this image
(https://i.ibb.co/SrzKvQr/beauty.jpg) (https://ibb.co/Zm0hTHm)
and the crystal is configured in all the ways that propagate mask has.
mask never
(https://i.ibb.co/d71LD13/1-mask-never.jpg) (https://ibb.co/rvTcHTL)
mask reflect
(https://i.ibb.co/Ctkb631/2-mask-reflect.jpg) (https://ibb.co/rtCx3R7)
mask refract
(https://i.ibb.co/XWbsQzD/3-mask-refract.jpg) (https://ibb.co/Rg90FCN)
mask always
(https://i.ibb.co/nc7jWbt/4-mask-always.jpg) (https://ibb.co/SntBLPG)

first I see that the reflect mode, transmits the reflection totally opaque.
secondly, the always mode does not make a correct mix of reflect (which I think should be more transparent) and refract mode, but that is not the case.

what should i do, so that the "mask always" image looks like the image below. (this image i have made in photoshop.
(https://i.ibb.co/s6zx4kz/mask-propagate-correct.jpg) (https://ibb.co/Hx3wy13)

Title: Re: problem propagate masks
Post by: maru on 2021-08-06, 11:45:26

I am guessing that you want to replace the background in post and you want to see the reflection of the red box in the glass.
I made a similar scene to yours and tried this, and despite the alpha channel looking "wrong" (black), the reflection is there. This is because alpha is not 100% black there. You can verify that by right-clicking in the VFB and sampling the color. As you can see, it is not 100% black.

Let me know if this helps, and if not, please send me your scene.