Results 1 to 12 of 12

Thread: Bullet softbody melting

  1. #1
    CG Generalist akademus's Avatar
    Join Date
    Feb 2003
    Location
    Dubai, UAE
    Posts
    1,606

    Bullet softbody melting

    Hey everyone,

    I've been messing with this the whole morning now. My idea is to use bullet to pour icecream into the cone. However, I cannot seem to get upper part to pour down while retaining the base in more/less same shape.

    Anyone has an idea? I attached screen grab and lw project...

    Click image for larger version. 

Name:	Capture.JPG 
Views:	176 
Size:	191.0 KB 
ID:	112579
    Attached Files Attached Files

  2. #2
    Banned OnlineRender's Avatar
    Join Date
    Dec 2008
    Location
    Glasgow , Scotland , UK
    Posts
    6,359
    did you assign weight map ?

  3. #3
    CG Generalist akademus's Avatar
    Join Date
    Feb 2003
    Location
    Dubai, UAE
    Posts
    1,606
    Quote Originally Posted by OnlineRender View Post
    did you assign weight map ?
    To what?

    I'm trying to solve it with distance to null in Shape Retention and Damping Coeficient but it doesn't seem to work.

  4. #4
    Space Monkey 3DGFXStudios's Avatar
    Join Date
    Sep 2005
    Location
    Earth
    Posts
    3,121
    I tried something like that to. It looked to me like the weightmaps I created didn't work at all when assigned to the Shape Retention. The mesh filter isn't an option either since it doesn't respect the settings on the edges of the weightmap which is a really bad thing. I think the edges where the weight map stops working need to respect the stiffness settings. With the current implementation of the mesh filtering system you always get a sharp bending edge where the dynamics are "on/off". What you can do to fix this is make a mdd file and blend the mdd with the original mesh. This way you can have a weight map that really blends from 0 to 100. Mixing mdd would be an option to. If you like the simulation of the bottom part you can use that and blend them with a cool sim of the top part.

  5. #5
    Quite a shallange!

  6. #6
    CG Generalist akademus's Avatar
    Join Date
    Feb 2003
    Location
    Dubai, UAE
    Posts
    1,606
    Quote Originally Posted by 3DGFXStudios View Post
    I tried something like that to. It looked to me like the weightmaps I created didn't work at all when assigned to the Shape Retention. The mesh filter isn't an option either since it doesn't respect the settings on the edges of the weightmap which is a really bad thing. I think the edges where the weight map stops working need to respect the stiffness settings. With the current implementation of the mesh filtering system you always get a sharp bending edge where the dynamics are "on/off". What you can do to fix this is make a mdd file and blend the mdd with the original mesh. This way you can have a weight map that really blends from 0 to 100. Mixing mdd would be an option to. If you like the simulation of the bottom part you can use that and blend them with a cool sim of the top part.
    Dumb question, but how do you blend two mdds?

    EDIT: Found it http://forums.newtek.com/showthread....How-to-mix-MDD
    Last edited by akademus; 03-14-2013 at 05:17 AM.

  7. #7
    TD/Animator lino.grandi's Avatar
    Join Date
    Jun 2003
    Location
    Rome
    Posts
    1,701
    You can find some Bullet Dynamics melting scenes in the 11.5 content.
    Lino Grandi
    3D Development, LightWave 3D Group/NewTek, Inc.

    https://www.lightwave3d.com/

    LightWave 3D Group YouTube channel:

    http://www.youtube.com/user/Official...?feature=watch

    My YouTube Channel:

    http://www.youtube.com/user/linograndi?feature=mhee

  8. #8
    CG Generalist akademus's Avatar
    Join Date
    Feb 2003
    Location
    Dubai, UAE
    Posts
    1,606
    Thanks Lino,

    I already found chocolate ones. Very insightful.

    Mdd blending seems to work. Not the happiest of solutions but it works nonetheless.

    Click image for larger version. 

Name:	Capture2.JPG 
Views:	108 
Size:	180.4 KB 
ID:	112581

  9. #9
    Banned OnlineRender's Avatar
    Join Date
    Dec 2008
    Location
    Glasgow , Scotland , UK
    Posts
    6,359
    hmm I cant seem to remove the gradient texturing on the shape retention

  10. #10
    CG Generalist akademus's Avatar
    Join Date
    Feb 2003
    Location
    Dubai, UAE
    Posts
    1,606
    I noticed bullet wont refresh when you switch gradient on / off. You need to reset cache...

  11. #11
    Banned OnlineRender's Avatar
    Join Date
    Dec 2008
    Location
    Glasgow , Scotland , UK
    Posts
    6,359
    I got the top to drop but it just wobbled like jelly at the base , if I am honest I think bullet needs some more work

  12. #12
    Space Monkey 3DGFXStudios's Avatar
    Join Date
    Sep 2005
    Location
    Earth
    Posts
    3,121
    Bullet needs a simple way to blend kinematic and soft dynamics. Shape retention and mesh filter ins't good for that.
    It also needs constraints springs and hinges.
    For now bullet is only suitable for dropping stuff (almost)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •