Corona Renderer for 3ds Max > [Max] Bug Reporting

Corona 8 Daily Build - Glosiness / Reflection visibility problem

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Dionysios.TS:
Hi Corona team!

Today I've found out a big and serious defect which is related to the Glossines and the reflection/refraction visibility of the objects.
To replicate this please use the latest January Daily Buld and do the following steps:

- Create a white plane and put a reflection with glossiness 0.5
- Create a red teapot and put a reflection with glossiness 0.5
- Create a blue teapot and put a reflection with glossiness 0.5
- Create a Corona daylight system and render to see the result.

FIRST APPROACH: Now, right click on the red teapot and under the object properties turn off the "Visible to Reflection / Refraction".
PROBLEM: Render and you should see the glossiness of the other objects wrong!

SECOND APPROACH: Turn on the previous "Visible to Reflection / Refraction" but instead of that go the red material and bring Opacity to ZERO.
PROBLEM: Render and you should see the glossiness of the other objects wrong!

I've tried with one of the October's build 12/10/2021 and is happening as well while the build August 10/08/2021 works perfectly fine!

Let me know if you can replicate this problem.

Thanks,

Dionysios -

GeorgeK:

--- Quote from: Dionysios.TS on 2022-01-19, 17:27:27 ---Hi Corona team!

Today I've found out a big and serious defect which is related to the Glossines and the reflection/refraction visibility of the objects.
To replicate this please use the latest January Daily Buld and do the following steps:

- Create a white plane and put a reflection with glossiness 0.5
- Create a red teapot and put a reflection with glossiness 0.5
- Create a blue teapot and put a reflection with glossiness 0.5
- Create a Corona daylight system and render to see the result.

FIRST APPROACH: Now, right click on the red teapot and under the object properties turn off the "Visible to Reflection / Refraction".
PROBLEM: Render and you should see the glossiness of the other objects wrong!

SECOND APPROACH: Turn on the previous "Visible to Reflection / Refraction" but instead of that go the red material and bring Opacity to ZERO.
PROBLEM: Render and you should see the glossiness of the other objects wrong!

I've tried with one of the October's build 12/10/2021 and is happening as well while the build August 10/08/2021 works perfectly fine!

Let me know if you can replicate this problem.

Thanks,

Dionysios -

--- End quote ---

Hi Dionysios, I can't seem to replicate this can you send me a simple repro-scene?

Dionysios.TS:

--- Quote from: GeorgeK on 2022-01-20, 08:40:43 ---
--- Quote from: Dionysios.TS on 2022-01-19, 17:27:27 ---Hi Corona team!

Today I've found out a big and serious defect which is related to the Glossines and the reflection/refraction visibility of the objects.
To replicate this please use the latest January Daily Buld and do the following steps:

- Create a white plane and put a reflection with glossiness 0.5
- Create a red teapot and put a reflection with glossiness 0.5
- Create a blue teapot and put a reflection with glossiness 0.5
- Create a Corona daylight system and render to see the result.

FIRST APPROACH: Now, right click on the red teapot and under the object properties turn off the "Visible to Reflection / Refraction".
PROBLEM: Render and you should see the glossiness of the other objects wrong!

SECOND APPROACH: Turn on the previous "Visible to Reflection / Refraction" but instead of that go the red material and bring Opacity to ZERO.
PROBLEM: Render and you should see the glossiness of the other objects wrong!

I've tried with one of the October's build 12/10/2021 and is happening as well while the build August 10/08/2021 works perfectly fine!

Let me know if you can replicate this problem.

Thanks,

Dionysios -

--- End quote ---

Hi Dionysios, I can't seem to replicate this can you send me a simple repro-scene?

--- End quote ---

Hi George, I need to finish some things and reinstall the latest build and send you a sample file. Yesterday I was having this issue for all the morning without being able to find a solution at all! I'll try again later today and I'll be back to you.

Thanks for your patience.

Dionysios.TS:
Hi again George,

I replicated the problem in a simpler scene trying to include the basic shaders which are present in the very big one where I initially yesterday found out the problem.
The difference now is that we have a shadow catcher material and the issue is replicated ONLY if we turn off the "Visible to Reflection / Refraction" option on the object who has that material.

- Load the scene and select the object SELECT ME
- Render and look at the result
- Now go the object's properties and turn off the option "Visible to Reflection / Refraction"
- You'll noticed the reflections on the 2 coloured teapots that are not the same but are altered! The red one seems also a bit mettalic!

Is this a normal behaviour? If we don't want the Shadow Catcher objects being reflected in the scene, is not possible or something is wrong?
A last thing, yesterday I am 200% sure that the problem was present also as I described on my first post but not I can't replicate it either, I am sorry!

Thanks,

Dionysios -

GeorgeK:
Hi and thanks for sharing the file, I am afraid this is an expected limitation regarding light transport issues/black highlights, you can read more about it here: https://support.corona-renderer.com/hc/en-us/articles/4402699661585-Known-bugs-and-limitations

Roughness/glossiness plays a big role in this, as well as certain camera angles can make this effect more prominent. As for the initially reported issue, please note that even if an object is set to be invisible in reflections/refractions its shadows/bounces can still affect neighboring objects so this is why you've might have witnessed red color bleed on your blue teapot's rough-reflection.

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