Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Celph88 on 2016-07-06, 11:23:02

Title: Hair and Fur problem
Post by: Celph88 on 2016-07-06, 11:23:02

Hello!

Can someone tell me why, eaven if I set the value for Tip Thick to 0, my grass looks like some plstic tubes?

In the evnvironment and effects menu, the hair and furr hair is on geometry.

(https://s31.postimg.org/org508uav/image.jpg)

Title: Re: Hair and Fur problem
Post by: maru on 2016-07-06, 12:30:35

Did you also lower the roo thick option?
Generally it is better to scatter grass with Corona Scatter, or some 3rd party plugins.

Title: Re: Hair and Fur problem
Post by: romullus on 2016-07-06, 12:54:31

That's how hairNfur works unfortunatelly. You can see it by yourself: go to H&F modifier's last rollout display and turn on display as geometry option. Now hair will be displayed as geometry in viewport, that is exactly how Corona renders it. See how you can't make tips to be zero sized no matter what.

There is one trick you can try however. Make tips transparent through material and that should give much nicer look. Plug gradient ramp into opacity slot and under coordinates rollout choose WU radio option, set first and third flags to white colour and second flag to black. Slide 3rd flag to right at about 80-95% position and you should be good to go. Notice however, that this can significantly increase render time, so use it with caution.

Title: Re: Hair and Fur problem
Post by: maru on 2016-07-06, 15:34:12

WTF.
Looks like "rand scale" is somehow responsible for this. (See screenshots)
You can also use custom geometry for your hair/grass.

Title: Re: Hair and Fur problem
Post by: PROH on 2016-07-06, 16:22:28

It's not just "Rand. Scale" that gives this result. "Scale" & "Cut Length" gives the same result. So if using Hair & Fur together with System Units set to meter (typical exterior/city-scape scene) then there's no way to reduce the length without getting "tubes" (- or am I missing some parameter?).

Title: Re: Hair and Fur problem
Post by: romullus on 2016-07-06, 17:13:10

It looks like scale is not really scale, but rather cut in H&F :/

Quote from: PROH on 2016-07-06, 16:22:28

It's not just "Rand. Scale" that gives this result. "Scale" & "Cut Length" gives the same result. So if using Hair & Fur together with System Units set to meter (typical exterior/city-scape scene) then there's no way to reduce the length without getting "tubes" (- or am I missing some parameter?).

You can scale guides in styling rollout. That would be proper scale unlike that one in general parameters.

Title: Re: Hair and Fur problem
Post by: PROH on 2016-07-06, 17:36:37

Thanks romullus. Will try that.

Title: Re: Hair and Fur problem
Post by: Celph88 on 2016-07-06, 20:33:40

Eyo, thanks guys.

I scaled them sobs in styling rollout and it worked.
(https://s31.postimg.org/nuufmsbt3/image.jpg)

If I use the scale from the general parameters it cuts the tip right off and gives them that tube look.

Cheers!