Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: jankarl on 2020-11-15, 02:04:45

Title: Is my shader too complex? (IPR PROBLEM)
Post by: jankarl on 2020-11-15, 02:04:45

I think it's day two or three with this engine not entirely sure, been having fun with procedural textures cause guess what? IT SUPPORTS NATIVE SHADERS!! (YAY), except there's a bug. When making changes with the specific texture, displacement isn't taken into account by the IPR (same goes for VFB rendering), it's pretty consistent, it only works on the texture your working on, if you made a change with another texture the bug doesn't work. I also made a python script to refresh the rendering cause it's really consistent

Here's a video showcasing the bug.

Here's the scene file.
https://drive.google.com/file/d/1iJFi7lfdCrUl4P-F-Zq0T4vJsr-JLDLY/view?usp=sharing

Here's the script (if you want it).
https://drive.google.com/drive/folders/1y83Zfn4QaUH3ln_GEsMDxrkxF0PoyToM?usp=sharing


P.S. I was changing the GI solver because cleaning up was taking awhile (probably because of the screen recorder). Also speed up the video it took longer than I expected it to be.

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: Cinemike on 2020-11-15, 16:10:53

Displacement never gets updated when using the IR. It's by design.

I got the advice to use C4D's Interactive Render Region for setting up displacement (in materials) which is not as convenient as the IR but works.

CU
Michael

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: jankarl on 2020-11-16, 01:19:25

By design? What was it meant to do in the first place if it was by design?

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: Cinemike on 2020-11-16, 05:29:16

It renders displacement the first time it gets started, later changes in displacement won't be updated. It's for performance reasons.

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: Nejc Kilar on 2020-11-23, 08:11:12

Quote from: Cinemike on 2020-11-15, 16:10:53

Displacement never gets updated when using the IR. It's by design.

I got the advice to use C4D's Interactive Render Region for setting up displacement (in materials) which is not as convenient as the IR but works.

CU
Michael

Is it really by design though? If I recall correctly 3ds Max behaves more in line of what you'd expect - I could be wrong but I think it recalcs the displacement upon any changes to the material or camera angle. This could be a good discourse here.

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: romullus on 2020-11-23, 10:07:37

In 3ds Max displacement does not get updated on camera movement, nor on changes to the material (except for changes in displacement settings). It is by design.

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: Nejc Kilar on 2020-11-23, 13:40:08

Quote from: romullus on 2020-11-23, 10:07:37

In 3ds Max displacement does not get updated on camera movement, nor on changes to the material (except for changes in displacement settings). It is by design.

Huh, then I'm plain wrong here :) Just out of curiosity, is that how it's always been? I think I remember it refreshing when changing the displacement strength (min/max) at least. Could be wrong though!

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: romullus on 2020-11-23, 15:40:20

Yes, as i mentioned in my previous message, changing any displacement settings will update displacement in the VFB.

Title: Re: Is my shader too complex? (IPR PROBLEM)
Post by: Nejc Kilar on 2020-11-24, 17:07:30

Quote from: romullus on 2020-11-23, 15:40:20

Yes, as i mentioned in my previous message, changing any displacement settings will update displacement in the VFB.

Well then, I need to apologize for not reading your post correctly :D Not staying up late again!