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Thread: Looking for advice on modelling an explosion mushroom cloud.

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    Super Member Paul_Boland's Avatar
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    Question Looking for advice on modelling an explosion mushroom cloud.

    Hi Folks.

    I am trying to model an explosion mushroom cloud. I have tried a few different approaches to it but I usually end up with a weird looking smooth mushroom. The real problem is getting all those round balls of smoke that make up the cloud. I don't need it animated, just a solid polygon object that looks somewhat decent will suffice. Not asking anyone to make it for me but if you can offer some advice on how to do it that would be appreciated.
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  2. #2
    Have you tried using meatballs?
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    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by Paul_Boland View Post
    Hi Folks.

    I am trying to model an explosion mushroom cloud. I have tried a few different approaches to it but I usually end up with a weird looking smooth mushroom. The real problem is getting all those round balls of smoke that make up the cloud. I don't need it animated, just a solid polygon object that looks somewhat decent will suffice. Not asking anyone to make it for me but if you can offer some advice on how to do it that would be appreciated.
    Ghostlight studios did something like that for a tiny effect shot...with hypervoxels on geometry or particles..see youtube clip here..
    http://<a href="https://www.youtube....9aJt_YSgnE</a>

    It was actually based on similar principles that a certain lightwaver did for the 24 serious with Kiefer Sutherland, jacks worst day or something the episod was called, but for the mushroom cloud he used the old dynamite plugin due to the nice blackbody illumination, but used hypervoxels for the actual stem and points or particles for that.


    Today I think you could do a toroid or something either as polygon mesh, or perhaps as primitive toroid shape, and displace it, and convert it to volume fog, or you use it and plug it to the gas solver so the toroid mesh is
    the fluid density mesh emitter, but also with the dynamics of the gas solver.

    Long time ago.. used a circle converted to bones in the middle of the polygon toroid and just selected all bones and rotated the pitch I think.....https://vimeo.com/26391236

    Then you could mess with particles, but that takes some skills..just like David Ridlen did with his fire in the city clip and only some winds and particles and hypervoxels.

    Edited...just noticed, not animated?
    If you got Lighwave 2019, make a torus divide it alot and turn to subpatch, deform it along itīs normals with some nice procedural, use VDB tools and convert it to a VDB volume with mesh to volume.
    Add a blackbody radiator to shade it.

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    Some nice renders by Prometheus at the end of page 2 in this thread. The tip was using a free tool for simulation, then import to LW.
    https://forums.newtek.com/showthread...PRO-v1-2/page2

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    Registered User ianr's Avatar
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    Kelly Myers has got it Liberty 3d.com

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    Super Member Qexit's Avatar
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    I don't know how far back your LW collection goes Paul but there is a crude mushroom cloud scene in the LW 8 Content or even further back there was an ABomb mushroom cloud scene created by Dean Scott on Light-ROM 6.
    Kevin F Stubbs

    Remember...one size does NOT fit all

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    Super Member Paul_Boland's Avatar
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    Thanks, folks, your feedback gave me some direction and I'm making progress. I should be able to get the image I need with a bit more tweaking.
    PS: The meatballs was the best idea I got .

    Click image for larger version. 

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    RETROGRADER prometheus's Avatar
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    mush room top displace rotation.zip

    Is there a better way of managing old attachment posts than start attach and then browse through whay you uploaded?
    I would want to download many of my old attachements.

    Gambling here..have to post this before I can download it and check what it was...

    oh ..that was applied with old hvīs, so either use Lw 2015, or activate old legacy volumetrics, and you need windy wave rman textures from Dpontīs rman collection.

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    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by Free4Ever View Post
    Some nice renders by Prometheus at the end of page 2 in this thread. The tip was using a free tool for simulation, then import to LW.
    https://forums.newtek.com/showthread...PRO-v1-2/page2
    Yes of course though that was plain explosions, one need to adjust that to look more like a mushroom nuke.

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    And if you import the vdb file from blender?

    https://www.youtube.com/watch?v=e38Y_qOjMLA

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    English is not my native language so please be patient.

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    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by Asticles View Post
    And if you import the vdb file from blender?

    https://www.youtube.com/watch?v=e38Y_qOjMLA

    Regards
    What was the question? it is doable of course.

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    Quote Originally Posted by Paul_Boland View Post
    Thanks, folks, your feedback gave me some direction and I'm making progress. I should be able to get the image I need with a bit more tweaking.
    PS: The meatballs was the best idea I got .

    Click image for larger version. 

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    The current image looks like a (forest) mushroom on fire that emits some hypervoxels to me, not like a nuke.

    A volume render would look much better.

    If you have 2018 / 2019 I can make a VDB mesh mushroom for you with TFD or another fluid system but you'd have to wait until weekend.

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    Super Member XswampyX's Avatar
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    Quote Originally Posted by Marander View Post
    The current image looks like a (forest) mushroom on fire that emits some hypervoxels to me, not like a nuke.

    A volume render would look much better.

    If you have 2018 / 2019 I can make a VDB mesh mushroom for you with TFD or another fluid system but you'd have to wait until weekend.
    Hehe.. Grow your own Shroooms!

    Click image for larger version. 

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  14. #14
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by XswampyX View Post
    Hehe.. Grow your own Shroooms!

    Click image for larger version. 

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    Seriously cool Xswampy, thanks for sharing..though I think it could grow a little bit in the beginning rather than pop in so to speak.

    When I got you in the VDB window
    Have you tried pushing the gas solver with particle velocity fed in to the force grid, in 2019.0.3 I made some scenes, but now in 2019.1 it doesnīt work anymore.
    Itīs not particles that is the emission source, itīs a mesh to volume as you have set up..but driven with particles velocity fed to the input of the gas solvers force grid.

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    Super Member XswampyX's Avatar
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    Quote Originally Posted by prometheus View Post
    Seriously cool Xswampy, thanks for sharing..though I think it could grow a little bit in the beginning rather than pop in so to speak.

    When I got you in the VDB window
    Have you tried pushing the gas solver with particle velocity fed in to the force grid, in 2019.0.3 I made some scenes, but now in 2019.1 it doesnīt work anymore.
    Itīs not particles that is the emission source, itīs a mesh to volume as you have set up..but driven with particles velocity fed to the input of the gas solvers force grid.
    Thanks.

    No I haven't... click click....

    Click image for larger version. 

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    Yeah, it works in LW 2019.0.3

    I haven't installed the new one yet.
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