groomtools - hair layering compounds

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GroomtoolsAuthor: Reinhard Claus
A set of compounds for creating hair (ICE strands) by using groups of curves as guides (By using groups, guides can be easily duplicated/removed). The generated strands can themselves be used as guides, which allows to generate a number of effects including clumping.

Hair can be styled using a layered approach, a layer represents a simple 'groom' that can be blended with other layers into more complex shapes. Blending of different layers can be done using a simple weight slider, or parametrically using guide distance, painted weightmaps or distance nulls. Each layer can have its own guide group, also guide groups or individual guides can be shared between layers. The provided sample scenes shows most of the available options.

See the si-community thread for more examples.

Requires: ICE Array Nodes

download: Hair Emit.2.0.xsicompound Hair Layer.2.0.xsicompound Morph To UV.xsicompound groomtools_1.52_demoscenes.zip

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rray
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groomtools - hair layering compounds

Post by rray » 08 Feb 2016, 21:53

Here's 2 new compounds "hair layer" and "hair emit" that do ICE strand interpolation from guide curves

Use as follows:

* Install ICE array nodes (won't work without)
* Create emitter poly mesh (shouldn't be closed geo, for example use top half of a sphere)
* Create UVs using property->Texture Projection->Unfold
* Paint a weightmap on the emitter, with higher values where the hair is to become more dense (this step is optional)
* Duplicate the emitter mesh, create an ICE tree on it and plug in the "Morph to UV" compound, rename it to *_uv_helper or similar
* Create an empty point cloud, add a new ICETree and plug in the Hair Emit compound, plug the emitter mesh into this node
* Make the point cloud and the other mesh unselectable - this will help with the curve styling later
* Now you could add all following nodes to one ICE tree, but performance will be better when you separate the emit and the layer compounds to different ICE trees
* Create a new ICE tree on the point cloud and add a Hair Layer compound
* Plug the two meshes into that one, and a Get Data of a group with guide curves. Guide curves can be added dynamically by duplicating after that.
* Add more Layer or more Emit compounds (adding another Emit will make all existing strands guides - use this for clumps)
* You can modify layer parameters with factory compounds such as modulate by null
* You can add additional effects using factory nodes such as curl, plugged into "other effects" port. This is different than adding it as a new tree because it will use the layer blending

Some examples:

Image
Example 1-- this was done with a hair layer compound creating blue strands and another layer compound on top that creates yellow strands, either using 2 guides.
Blending was done by distance to guide curve (blue using a much bigger distance than yellow so it fills the whole object)

Image
Example 2 -- this uses "modulate by null" to blend the layers.
The first two layers (modulate by box shaped null) separating left and right (scatter blend)
The third (modulate by sphere shaped null) separating front and back (using regular blend)

Image
Example 3 - This uses a second emit compound. When a second emit compound is used, it will use all strands created by the first as guides. No additional guides have to be plugged into the next layer compound.
It also uses the factory "curl strands" compound to add a curl to the strands. Curl size random ID is controlled by the ICE attribute ClosestGuideID, so all strands belonging to one guide will have the same random value. Dissect the sample scene for more details.

Image
Example 4 - When no "override color" is used for the strands, it interpolates the guide's colors

Image
Example 5 - fur
Attachments
groomtools_2.0.zip
(146.47 KiB) Downloaded 160 times
groomtools_1.52_demoscenes.zip
(9.53 MiB) Downloaded 374 times
Softimage Resources section (formerly known as rray.de/xsi) updated Oct 01 2017

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Hirazi Blue
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Re: groomtools - hair layering compounds

Post by Hirazi Blue » 08 Feb 2016, 22:50

Very nice! Thanks for sharing... :ymhug:
...

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Re: groomtools - hair layering compounds

Post by rray » 08 Feb 2016, 23:45

You're welcome!

Credits btw: Uses internally Fabricio Chamons's "Relax Particles" for the even follicle's distribution, Anto Matkovic's "kH3 Hair Length" for the randomized cut off, also Dan Yargici's "Create Strands from Curves" with an update from Guillaume Laforge, which inside is using Julian Johnson's "Array Cumulative Sum"
Last edited by rray on 10 Feb 2016, 10:48, edited 2 times in total.
Reason: "Create Strands from Curves" wrong credit! Anto's last name fix!
Softimage Resources section (formerly known as rray.de/xsi) updated Oct 01 2017

Helli
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Re: groomtools - hair layering compounds

Post by Helli » 09 Feb 2016, 02:35

Would have been so nice back in the days when someone would have written a plugin to actually groom ice strands.

The workaround to connect it to S&H is just not really that elegant.

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Re: groomtools - hair layering compounds

Post by danyargici » 09 Feb 2016, 11:40

*ahem* Could be wrong, but I think you're using my 'Create Strands from Curves' compound... :)

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Re: groomtools - hair layering compounds

Post by rray » 09 Feb 2016, 12:03

Sorry, Dan - checked too quickly - it's indeed your's ofc! Guillaume posted an updated version here http://www.si-community.com/community/v ... =11&t=1778 that's where I got the notion from.
Softimage Resources section (formerly known as rray.de/xsi) updated Oct 01 2017

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Re: groomtools - hair layering compounds

Post by danyargici » 09 Feb 2016, 12:10

Ah, cool, no worries. I hadn't noticed he updated it. Cool. I have a bunch of compounds I've been meaning to share for ages, especially now as the curtain seems to finally be closing... I've been meaning to tidy some things up and never found the time. I'll make a thread and just dump them there for people to take and use as-is.

Great toolset btw! :-bd

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Re: groomtools - hair layering compounds

Post by rray » 09 Feb 2016, 12:51

Cheers Dan :-bd Yes, the tidying always takes much longer than anticipated. This was almost 2 days. There's always the option to "dump" unfinished stuff on the resourcedump thread here: http://www.si-community.com/community/v ... =27&t=3205. But for that one I had the time...carnival weekend which I'm always happy to miss :ymparty:
Softimage Resources section (formerly known as rray.de/xsi) updated Oct 01 2017

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Re: groomtools - hair layering compounds

Post by Hirazi Blue » 09 Feb 2016, 16:57

The sample scenes crash my Softimage whenever I hit render (MR & 3delight)... :-?
And on the occasions it doesn't crash I get weird results like the following, with "Simple_2_Layers_Setup_v_1_4"
Attachments
2016-02-09 16_28_36-DS_ChildRender Preview.png
...

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Re: groomtools - hair layering compounds

Post by rray » 09 Feb 2016, 17:26

It's using MR.
does the hair show ok in the viewport?
does it crash when you lower the number of emitted strands?
...when you delete the pointcloud?
...when you delete everything in the scene?
I'll upload the whole project tonight

*edit better try the 3_layers scene. The 2_layers scene has no real render setup.
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Re: groomtools - hair layering compounds

Post by Hirazi Blue » 09 Feb 2016, 17:53

Scene "Simple_2_Layers_Setup_v_1_4" is the only one that renders
with the following result:
Default_Pass_Main.5.jpg
The other three scenes get aborted:

Code: Select all

# ERROR : One or more framebuffers were invalid. Render aborted.
# ERROR : 21000-REND-RenderPasses - Unspecified failure - [line 258 in C:\Program Files\Autodesk\Softimage 2015 R2-SP2\Addons\RenderManager\Application\Plugins\RenderManager.vbs]
# ERROR : 21000-CUST-RenderCurrentFrame - Unspecified failure
...

julius
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Re: groomtools - hair layering compounds

Post by julius » 09 Feb 2016, 18:03

very nice !
thanks for sharing ! :-bd

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Re: groomtools - hair layering compounds

Post by Hirazi Blue » 09 Feb 2016, 18:21

I just exported the contents of the "Curly_1_4" scene into a new scene and it rendered. Took about 11 minutes though... :-?

edit: with all shadows and shadowmaps disabled it renders in 29 seconds...
...

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Re: groomtools - hair layering compounds

Post by rray » 09 Feb 2016, 18:32

@julius Welcome!

@HB It renders quite slow because of the "fake GI" light setup.. but not that slow... try switching to rasterizer, it could be that I activated this setting only in Viewport B renderregion settings :ymblushing:

These framebuffer messages might me some residual from the arnold plugin, but it shouldn't abort the render, that's weird. I'll make some better sample scenes later.
Softimage Resources section (formerly known as rray.de/xsi) updated Oct 01 2017

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Re: groomtools - hair layering compounds

Post by Hirazi Blue » 09 Feb 2016, 19:13

My previous 11 minute result was with scanline as it turns out.
With the rasterizer it took 25 minutes to complete...
(without the lightrig the rasterizer only needed 31 seconds)
:-o
...

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Re: groomtools - hair layering compounds

Post by FXDude » 09 Feb 2016, 20:50

That's absolutely astonishing work RRay! and looks fairly easy to setup, Kudos!

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