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Hair render problems

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Chris AllardHair render problems
by on Nov 23, 2011 at 2:51:47 pm

Hi,
I have a scene were I've rendered some hairs on a connect object comprised of a bunch of sweep nurbs. Here is my dilema... the hair apprears as it should in the preview render, however, when I render it to file, there are bare patches of hair where there should be hair.

any ideas? I don't have any sort of hair tags (colliders or constraints) set...
I've attached two screenshots to show.
any ideas of help would be greatly appreciated.

thanks
Chris




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Brian JonesRe: Hair render problems
by on Nov 23, 2011 at 9:10:55 pm

are the sweeps animated?


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Chris AllardRe: Hair render problems
by on Nov 24, 2011 at 2:05:56 pm

Hi Brian,
No animations. It is a static illustration.
thanks
Chris


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Brian JonesRe: Hair render problems
by on Nov 25, 2011 at 3:37:29 am

some quick tests just give me what you want... I'd have to see the scene


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Chris AllardRe: Hair render problems
by on Nov 25, 2011 at 2:45:50 pm

Here is a link to the file via yousendit.com
I'm using Cinema 4D v11.5
https://rcpt.yousendit.com/1296085714/27c9abd0f49e0ec3491bd16a2a057a2d


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Chris AllardRe: Hair render problems
by on Nov 25, 2011 at 4:49:02 pm

Having done some playing around with hair in a new file... I've managed to recreate the problem. It seems to stem from the fact that the roots are Connect Objects. Not too sure how to overcome that and make the hair look nice without having a hair object for each root branch, as each one is it's own sweep nurb. It would make for many dozen objects and a nightmare to manage.

Here is a link to the file via yousendit.com
I'm using Cinema 4D v11.5
https://rcpt.yousendit.com/1296085714/27c9abd0f49e0ec3491bd16a2a057a2d


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Brian JonesRe: Hair render problems
by on Nov 26, 2011 at 2:34:24 am

you've been duplicating the Hair object I think. Which duplicates the hair in the place of the object it was originally on (the roots remember). so it's not in the right place (select some of the hair objects and see where the hair is).

I took all your hair objects out, put all the Connectors in another Connector then added hair to that - works fine here - you get a single hair tag that way and can change it all at once. If you need several types of hair (I see brown and white) just use two connectors (or however many) you just have to add the hair after you can't duplicate it (if that's what you were actually doing)


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Brian JonesRe: Hair render problems
by on Nov 27, 2011 at 4:16:44 pm

oh and it helps to check 'As Normal' in Hair Object/Hairs/Roots when you have objects like these that are round and get really narrow.


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Chris AllardRe: Hair render problems
by on Nov 28, 2011 at 2:41:47 pm

Works like a charm.

What does checking "normal" in the Hair Object/Hairs/Roots do exactly?

Thank you so much.

Have a great day.

Chris


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Brian JonesRe: Hair render problems
by on Nov 28, 2011 at 6:09:17 pm

Activating this setting will ensure the hair root segments are oriented in the direction of the surface normals, regardless of what was defined for the guides.


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