how to make spring SOP moving hair particle without Elastic
7380 10 1- freesign
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Hi, i have some question about Spring SOP
i using spring SOP to make the hair drop down and collision with the model.
but there is a probelm, the spring will pull the hair to become longer, for example my hair is 10cm, but after spring SOP it may become 50cm. (show as the image bellow)
i want spring SOP moving the particle but without elastic, so the hair length didnt change, how can i do that ?
thanks
cheers
i using spring SOP to make the hair drop down and collision with the model.
but there is a probelm, the spring will pull the hair to become longer, for example my hair is 10cm, but after spring SOP it may become 50cm. (show as the image bellow)
i want spring SOP moving the particle but without elastic, so the hair length didnt change, how can i do that ?
thanks
cheers
- tamte
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there is Spring Constant parameter in Spring SOP which is something like Stiffness
set it really high to avoid elastic feel
but to make it stable, you also need to decrease Time Inc parameter
there is also Drag parameter you can increase to get smoother motion
set it really high to avoid elastic feel
but to make it stable, you also need to decrease Time Inc parameter
there is also Drag parameter you can increase to get smoother motion
Tomas Slancik
FX Supervisor
Method Studios, NY
FX Supervisor
Method Studios, NY
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- edward
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- freesign
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- tamte
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thanks for replying
as the hip files show the fur is base on a sphere who are always switching scale refer to rand($F).
and as the hair.PNG show that i want the hair shape is always in that shape whatever what size the sphere is.
i make some change in “OBJ_hair/clumps/__dispaly_sop__” to control the hair shape,i not sure is this the correct way to control the hair but i figure out this work.
and the sphere size was random in every $F, and i want whatever what size is it, the hair is in this shape as hair.png, and in the correct propotion but not changing propotion. (because the human model i use have alot of swimming point and unstable point in different frame)
what happen in this HIP files is, the hair continue fall down none stop because of the force, the more $F it is, the more longer the length of the hair, i would like to know is there anyway to make the hair fall down but not making the hair become long.
i have try to use Lock, yes, it work, but only for certain frame, some frame the hair is disappear, i don't know why.
i hope you can help me to figure out a way so i can control the human hair on a unstable model correctly.
thank you thank you very much.
as the hip files show the fur is base on a sphere who are always switching scale refer to rand($F).
and as the hair.PNG show that i want the hair shape is always in that shape whatever what size the sphere is.
i make some change in “OBJ_hair/clumps/__dispaly_sop__” to control the hair shape,i not sure is this the correct way to control the hair but i figure out this work.
and the sphere size was random in every $F, and i want whatever what size is it, the hair is in this shape as hair.png, and in the correct propotion but not changing propotion. (because the human model i use have alot of swimming point and unstable point in different frame)
what happen in this HIP files is, the hair continue fall down none stop because of the force, the more $F it is, the more longer the length of the hair, i would like to know is there anyway to make the hair fall down but not making the hair become long.
i have try to use Lock, yes, it work, but only for certain frame, some frame the hair is disappear, i don't know why.
i hope you can help me to figure out a way so i can control the human hair on a unstable model correctly.
thank you thank you very much.
Edited by - May 14, 2010 14:30:17
- freesign
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- tamte
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I have modified your spring SOP
Tine Inc: /10
Spring constant to 3000, you can tweak this for your actual scene
but most importantly you must specify Fixed Points
you didn't have one, so the hair was falling down and therefore generated fur was just longer and longer
i don't recommend you rand($F) because it produces sharp steps and no simulation likes this.
You better have deformations that can be resolved between frames like noise() or probably your character animation
if you want hair to keep shape, you heed to use wire dop simulation
Tine Inc: /10
Spring constant to 3000, you can tweak this for your actual scene
but most importantly you must specify Fixed Points
you didn't have one, so the hair was falling down and therefore generated fur was just longer and longer
i don't recommend you rand($F) because it produces sharp steps and no simulation likes this.
You better have deformations that can be resolved between frames like noise() or probably your character animation
if you want hair to keep shape, you heed to use wire dop simulation
Tomas Slancik
FX Supervisor
Method Studios, NY
FX Supervisor
Method Studios, NY
- freesign
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- 104 posts
- Joined: March 2008
- Offline
- freesign
- Member
- 104 posts
- Joined: March 2008
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