Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: OleksandrMelnyk on 2019-12-01, 19:09:00

Title: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-01, 19:09:00
Why can't I transfer the drawing to the fur ?
Help me please!
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2019-12-01, 19:33:31
Texturing with bitmaps is not supported in hair material when used with H&F. You need to uncheck apply shader in H&F and add the texture to the root and tip colors in material parameters.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-01, 19:36:15
yes, but it slows down the rendering very much and the quality of the coat comes out very poor
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-01, 19:50:03
This is a big setback for me (
I tried to solve this problem for more than 3 hours (
I need to present the project tomorrow, and it seems to me that the only option for me is to try to make a carpet using Forest Pack Pro.(
Title: Re: Problem of Hair and fur Corona Render 5
Post by: sprayer on 2019-12-01, 22:44:01
It should work with world scale

(https://i.imgur.com/4wkt2pe.jpg)
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-02, 11:07:36
It should work with world scale

(https://i.imgur.com/4wkt2pe.jpg)

this only works with procedural maps, but does not work with texture (bitmap)!
and if it does not work with a bitmap, then how can the fur be considered working in the Corona render if it cannot be used to the full?
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2019-12-02, 11:37:11
It does work with bitmaps, but it has serious drawbacks - it's bound to world coordinates, so you if you move your object, texture will stay in place relative to the world. It also overrides existing mapping with planar mapping, so it's suitable only for flat objects. For stationary carpet, this technique might work quite well, but it will fail in more complex scenarios.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-02, 12:18:48
It does work with bitmaps, but it has serious drawbacks - it's bound to world coordinates, so you if you move your object, texture will stay in place relative to the world. It also overrides existing mapping with planar mapping, so it's suitable only for flat objects. For stationary carpet, this technique might work quite well, but it will fail in more complex scenarios.
Well, I never managed to do what I wanted (
and if the function does not work as it should, then it means that it does not work at all! thanks !
Title: Re: Problem of Hair and fur Corona Render 5
Post by: GeorgeK on 2019-12-02, 13:15:09
It does work with bitmaps, but it has serious drawbacks - it's bound to world coordinates, so you if you move your object, texture will stay in place relative to the world. It also overrides existing mapping with planar mapping, so it's suitable only for flat objects. For stationary carpet, this technique might work quite well, but it will fail in more complex scenarios.
Well, I never managed to do what I wanted (
and if the function does not work as it should, then it means that it does not work at all! thanks !

You could use corona scatter for this!
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-02, 13:20:49
It does work with bitmaps, but it has serious drawbacks - it's bound to world coordinates, so you if you move your object, texture will stay in place relative to the world. It also overrides existing mapping with planar mapping, so it's suitable only for flat objects. For stationary carpet, this technique might work quite well, but it will fail in more complex scenarios.
Well, I never managed to do what I wanted (
and if the function does not work as it should, then it means that it does not work at all! thanks !

You could use corona scatter for this!

Thanks, but I already did it with the help of Forest pack pro
Title: Re: Problem of Hair and fur Corona Render 5
Post by: GeorgeK on 2019-12-02, 13:30:19
Looking good :), keep it up!
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2019-12-02, 15:19:25
It does work with bitmaps, but it has serious drawbacks - it's bound to world coordinates, so you if you move your object, texture will stay in place relative to the world. It also overrides existing mapping with planar mapping, so it's suitable only for flat objects. For stationary carpet, this technique might work quite well, but it will fail in more complex scenarios.
Well, I never managed to do what I wanted (
and if the function does not work as it should, then it means that it does not work at all! thanks !

I already said that it's not working in my first reply ;] But sprayer also did show you that sometimes it's possible to work around this problem. Here's short video that shows how it works. The solution is far from perfect, but sometimes, when you really really need it, it can save your day.


BTW, this technique works with Corona scatter too.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: OleksandrMelnyk on 2019-12-02, 16:45:28
Thank you !
Title: Re: Problem of Hair and fur Corona Render 5
Post by: jrgby on 2019-12-02, 17:25:20
Good tip. I tried to do this recently and couldn't figure out why I couldn't get it to work.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2019-12-02, 17:37:18
Glad to help :]
Title: Re: Problem of Hair and fur Corona Render 5
Post by: maru on 2019-12-02, 17:55:39
This was already discussed many times, and sadly it looks like a limitation we are not able to overcome.
https://forum.corona-renderer.com/index.php?topic=19802.msg123812#msg123812
Title: Re: Problem of Hair and fur Corona Render 5
Post by: leon51 on 2020-05-06, 14:21:02
Hi Maru, I just wanted to say I've been playing around with Hair and Fur and figured out how to get the texture showing through. I've just posted a tutorial on youtube showing how to do it. I hope it helps some people with similar issues. Here's the link:

Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2020-05-06, 14:27:42
360p? Do you have version with slightly more reasonable resolution?
Title: Re: Problem of Hair and fur Corona Render 5
Post by: leon51 on 2020-05-06, 14:51:33
Hi Romullus, I uploaded at 2640 by 1440 - I guess it's taking a little while longer than usual for youtube to process it.

Best, Tom

YouTube state:

When you upload a video, it will initially be processed in low resolution. This helps the video to upload faster. Once your upload has been completed, your video will be available to stream in low resolution, usually 360p, on a wide variety of devices.

Higher resolutions, such as 4K or 1080p, can take more time to process. While this happens, your video may appear to be missing high-quality options, such as 4K or 1080p, for several hours. Once high-resolution processing is finished, higher resolutions will be available on your video.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2020-05-06, 14:55:16
Thanks, i will wait for YT to process the video then. Does this method works only on planar objects, or with any object?
Title: Re: Problem of Hair and fur Corona Render 5
Post by: leon51 on 2020-05-06, 16:55:07
Hi Romullus,

So, I've just checked and it's now at 1920 x 1080.

It works on any object, I figured it out while trying to get it to work on a cat I was putting in a scene. It will copy whatever mapping you have on the base object, so as long as that's correct, all good.

Here's how the cat looks. 

Best, Tom
Title: Re: Problem of Hair and fur Corona Render 5
Post by: romullus on 2020-05-06, 17:23:01
Sorry to disappoint you, but you didn't discovered anything new. This method is well known and was discussed many times on the forum. It's a workaround, but very poor one. The problem is, that you're not using Corona hair material for this and hair rendering quality is mediocre - you had to extensively use curves and still got nowhere near to the rich colours of source bitmap.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: maru on 2020-05-06, 17:40:58
Hah, I was hoping to have watched a tutorial that would change the fate of humanity, but sadly it's not the case. :)

Check out the attached screenshot (which is a screen capture from your tutorial).

Fun fact: even Arnold doesn't support this (which is kinda funny since both Hair and Fur and Arnold are officially parts of 3ds Max, developed by the same company). You need to use some black magic to make it work: https://veda3d.com/arnold-with-hair-and-fur-modifier/

(https://forum.corona-renderer.com/index.php?action=dlattach;topic=27080.0;attach=125924;image)
Title: Re: Problem of Hair and fur Corona Render 5
Post by: leon51 on 2020-05-06, 17:50:21
Hi Maru and Romullus, Okay, well understood, yeah it doesn't change the world. I was using output and colour correction to adjust it, it might not quite match the source but it gets pretty close. And you're right, I didn't use Corona Hair material - that would have been nice. :)

That's an interesting fact about Arnold too. It's very similar.
Title: Re: Problem of Hair and fur Corona Render 5
Post by: cjwidd on 2020-08-08, 01:09:40
Just to reiterate what has already been said, the only workaround - which itself is not a production-ready solution - is to pipe whatever bitmap is being used to shade the base surface into the tip and root color?

The video from leon51 claims that the Custom Shader (apply shader) option does not work. Is that verified as of Corona 6 RC1?