Kai Stavginski


About Me

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Kai Stavginski has been a Senior Technical Director for SideFX Software since 2014. In that time, he's mostly been busy in the areas of shading and fur tools. He started in the industry as a generalist in 2004, spent some time as a rigger for an animated feature and then created VFX for major Hollywood blockbusters for several years. He used Houdini to get the job done and now uses his extensive industry experience in his development work on the software itself.


My Talks

obj-image FMX
Shading in Houdini 16
obj-image FMX
Fur in Houdini 16

My Tutorials

obj-image Masterclass
Houdini 16.5 Masterclass | Fur & Hair Grooming Toolset
obj-image Masterclass
Houdini 16 Masterclass | New Shading Features
obj-image Masterclass
Houdini 16 Masterclass | Custom Shading
obj-image Masterclass
Hair and Fur Masterclass

Recent Forum Posts

guide/ hair interpolation Dec. 6, 2017, 9:44 a.m.

Yeah it should be pretty easy for us to implement such a thing.

I think you could even hack it yourself by setting a different clumpid primitive attribute value on each object's guides. Then you can control the inter-object blending using the Clump Crossover parameter on the hair generate object.

I'm still planning to implement something that actually pushes apart the guides when you use the Part Guides SOP. Just haven't gotten to it. It's pretty straight forward to do it now though with the Guide Bend SOP and it's ability to take a direction attribute, just not a one-click solution yet.

16.5 Hairgen slow ?? Nov. 17, 2017, 2:31 p.m.

I'm guessing the fact it took longer without args is just a coincidence? Did you run multiple times?

Did you run that first, maybe? Could be disk caching.

Just to throw in some more numbers - HairSOP2.hiplc took 16.75 seconds on my i7 5960x. It seems like we're having some trouble on threadripper - or maybe on windows. I'll see if I can find out more.

Cant get Hair Brushes to work Nov. 16, 2017, 4:16 a.m.

After some more tests I noticed that the Brush Tools dont work correct on Unclosed Geometry. After doing polyfill the brushes lift option and surface brush work. Smooth brush still seems to have issues and I miss Wacom Pressure options to control strength etc. (I know can customize the wrangles inside the guidegroom) But there should be some better default artist friendly options.

Also I Hope one day houdini will get a real brush engine instead of faking things with the stroke SOP, The paint SOP could need some optimization too, espcially for wacom tablets. It feels very limited and clumsy to change settings etc.

I'm glad you found that this was partly due to open geometry. This is probably something we can fix internally, as most operators that rely on generating VDBs (as these do) should close the geometry as a preprocess step.

We do have some limitations still with the stroke SOP & state which we hope to address. But the tools that are in place should of course work out of the box, so please report any remaining issues as bugs.