2007-10-09

Hot Fuzz: Hair Revisited

In a previous post I briefly mentioned hair. People started to wonder about the details of that, so:

If you render hair w. Raytrace shadows and using the normal raytracer, it works.. but takes a while:



Whereas if one enables the Fast Rasterizer, and use Detail Shadow Maps, it can be both nicer looking and faster:



So the question then is... where do I turn this on?

I admit some things can be hard to find, and sometimes they are renamed in the UI of a particular application... for example, the mental ray detail shadow maps are actually not named "detail shadow maps" in 3DS max, they are named "Transparent Shadows". You find them here:



In Maya, however, they have their proper name and are found here:



However, Maya has "special" shadow settings for Hair and Fur one may need to watch out for.

Turning on the "Fast Rasterizer" is easier since it has it's proper name in most applications. Max:



And Maya:



Hope this helps with the "Fuzzy sidekick" rendering. Note that the Rasterizer is great for motion blur and fuzzy stuff, but can be suboptimal when involving many raytraced effects (glossy reflections, etc.)

/Z

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11 Comments:

Blogger InoDetelic said...

Yeah that helps also when making grass with hair.

If you put a good texture underneath, you don't need a lot of grass to make it nice and still have that cool shade underneath that gives a bit of life to your boring flat grass.

Tue Oct 09, 05:16:00 PM CEST  
Blogger Support said...

This post has been removed by a blog administrator.

Wed Oct 10, 09:49:00 AM CEST  
Blogger Pascal said...

Thanks for the tip!

But I still get lots of memory crashes! Is there a way to tweak the renderSettings with the Rasterizer?

Thu Oct 11, 08:30:00 PM CEST  
Blogger Cyberglad said...

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Tue Oct 30, 04:02:00 PM CET  
Blogger Akkhia59 said...

Hi!
I've got some trouble rendering hair with maya 2008...
I've got poor antialiasing quality even with Rasterizer and I cannot find anyway to make the detail shadow work with them...Only the regular shadow work...

Any help would be greatly appreciated!

Thanks a lot!

Sat Nov 17, 08:42:00 PM CET  
Blogger David said...

Akkhia59 -

Are you using volume fur? I believe only raytraced shadows work with that.

Sun Nov 25, 05:19:00 PM CET  
Blogger Akkhia said...

First of all thanks for replying!

No I use maya hair...and the weirder part is that I do have shadows with other preset than rasterizer but there's a major antialiasing problem...
Anyway I've contourned the problem by rendering it with maya software and I've got some accetable result...
But still I would be interessted to know why it doesn't work...
Cheers...

Sun Nov 25, 07:46:00 PM CET  
Blogger Peter Lorenz said...

Thanx for the tips.
I have a sphere with a furdescription on it, a groundplane and a spotlight that casts detail shadowmaps. However, so far it only casts a shadow onto the ground.
In other words, the fur does not come out black on the shadow side of the sphere(I'm using the rasterizer).
Would it be possible for you to share your scene?

Tue Jan 29, 11:00:00 AM CET  
Blogger Jignesh said...

Thanks for the tip. It works great. But when I render animation, hair and fur flicker in max. Is it becoz of Mentalray shadow map or mr-sky in the background? I am using daylight system with standard direction light and skylight, and MR-Physical sky in the background slot? Any help would be appriciate.

Fri Apr 25, 06:20:00 PM CEST  
Blogger falkken said...

Hi, I'm sorry about my english.

A lot of thanks for the tip!!

I've made a test and yes it produces a very smooth hair and a decent geometry antialias.

I would like to talk about some problems using this method in 3dsmax:
First as you can see this "fast rasterizer" ignore the Sampling quality of MR the bitmap of some textures are very weird.
Second the hair presents very strong fade on tips and it's more transparent and white (Has it to do with the light source?).

Thanks for your time!

Wed Sep 10, 12:50:00 PM CEST  
Blogger Cliff said...

Hi I wonder if you can help me, I am rendring fur using maya's mental ray. Each time I render out the the fur it flickers. I have tried every trick I no still flickers

Sun Jan 25, 08:01:00 AM CET  

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