hatrick Posted January 21, 2009 Share Posted January 21, 2009 hi, i try to build a dynamic simulation with feathers. currently i m in the modelprocess with fur and stuck with a few things... 1)how can i controll the orientation of my guidnormals .... for example of 2 opposed faces... the combtool is not really usable cause the skingeo is very small... 2)i couldnt find a tut ore guide how to setup maps for lenght ore cutshape hope you can help me out greets Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 21, 2009 Author Share Posted January 21, 2009 hi,i try to build a dynamic simulation with feathers. currently i m in the modelprocess with fur and stuck with a few things... 1)how can i controll the orientation of my guidnormals .... for example of 2 opposed faces... the combtool is not really usable cause the skingeo is very small... 2)i couldnt find a tut ore guide how to setup maps for lenght ore cutshape hope you can help me out greets pic Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 21, 2009 Author Share Posted January 21, 2009 pic ok one little step closer .... a $N+1 in the zvalue - addattribute/direction i tought hair orientation is generated with primitivenormals ... bit it looks like it comes with pointnormals ... Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 21, 2009 Author Share Posted January 21, 2009 ok one little step closer ....a $N+1 in the zvalue - addattribute/direction i tought hair orientation is generated with primitivenormals ... bit it looks like it comes with pointnormals ... so my hairguids are orientated globaly .. How can i set the furdirection value wich default is " $NX, $NY, $NZ to a local value for example when the Z value is set to $NZ+1 like above the hair orienaints to my normals + 1 to global Z direction.... thx Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 21, 2009 Author Share Posted January 21, 2009 so my hairguids are orientated globaly .. How can i set the furdirection value wich default is " $NX, $NY, $NZ to a local value for example when the Z value is set to $NZ+1 like above the hair orienaints to my normals + 1 to global Z direction.... thx omg solved by parenting my curve oject with the fur subnet by the transformed sourcegeo Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 21, 2009 Author Share Posted January 21, 2009 omg solved by parenting my curve oject with the fur subnet by the transformed sourcegeo now i have the problem with the lenght of the fur... i d like to have a smooth falloof from the from the middel to the root and the tip of the feather. short - long - short is this possible with an expression ? i can`t get accurate results with interactive painting... Quote Link to comment Share on other sites More sharing options...
kumpa Posted January 22, 2009 Share Posted January 22, 2009 Make spline with desired profile and make lookup upon it to define lengths if individual strands. Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 22, 2009 Author Share Posted January 22, 2009 ok , but how such setup would behave when it comes to dynamic simulation? Quote Link to comment Share on other sites More sharing options...
michael Posted January 22, 2009 Share Posted January 22, 2009 unless you're doing something VERY specific I would stay far far away from trying to simulate feathers...it'll be far more trouble than it's worth... can you give us an idea of what you're doing?...that will help us help you Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 22, 2009 Author Share Posted January 22, 2009 the final shot should show a kind of timefreeze effect ... combination of realworld footage and CG. cam dollys slowly through a mapped environmet ... the action is frozen and the campath is getting through a feathercloud with very minimal movement we will probobly use mapped imageplanes and particles to archive the effect.but some of the feathers should pass by close to the cam so details and dynamic behavour would be nice (for a few of them). in another thread i posted some questions about a dustcloud ... flour in our case ... there a similar effect should happen... overall ... camera - minimal movement action - frozen simulation - minimal movement i ll hopefully do the camera for that project and not the CG....don`t really know how the effect will be archived .... they re not working with houdini... for my part i'm just fascinated by the possibilitys of this software (what i heard and read about) and wanna try to get into...completly new! so heres my hip file feathertry.hipnc Quote Link to comment Share on other sites More sharing options...
kumpa Posted January 23, 2009 Share Posted January 23, 2009 this i had in mind feather.hip Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 23, 2009 Author Share Posted January 23, 2009 that looks good for shaping ... but... are the segments cut by the template curve ... ore is that an orientation setup. i'm thinking about simulation and the single hairlines should be able to move independently from each other...isn`t that a problem? another very basic question ... how i can get into simple expressions .. where i can find all the variables wih description... i know the example files and build in expressions from the helpguide but it`s hard to buildup my own from scratch... for example what`s $CY, "P" , a.s.o. ....sorry for such noob stuff! thx Quote Link to comment Share on other sites More sharing options...
hatrick Posted January 23, 2009 Author Share Posted January 23, 2009 that looks good for shaping ... but... are the segments cut by the template curve ... ore is that an orientation setup.i'm thinking about simulation and the single hairlines should be able to move independently from each other...isn`t that a problem? another very basic question ... how i can get into simple expressions .. where i can find all the variables wih description... i know the example files and build in expressions from the helpguide but it`s hard to buildup my own from scratch... for example what`s $CY, "P" , a.s.o. ....sorry for such noob stuff! thx sorry guys... forget bout that ... hopefully i`ll find some guidance .... let`s stay with the feather issue Quote Link to comment Share on other sites More sharing options...
kumpa Posted January 23, 2009 Share Posted January 23, 2009 Curves are fused together with Fuse SOP, if you try to simulate it you will notice that they actually move independently. What you would probably want to do is create point attribute that governs physical properties such as linear/angular damping/constant. Quote Link to comment Share on other sites More sharing options...
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