Thein Win Posted January 30, 2016 Share Posted January 30, 2016 Hi, this is my first post. So let me quickly introduce myself. I am from Burma. Currently studying VFX in the UK at the University of Hertfordshire. Rite now I am working on my final year film project. In the film I have lots of different particle effects. One of them I am struggling to get at the moment is a galaxy. I have tried many different ways but none of them seem to be looking very nice. Image I have attached below is from the breakdown of documentary Cosmos. I really like how it is looking with the spiral and particles around. So can anyone please help or guide me to achieve something like that. I have tried with trail sop and applying polywire and converted into volume and scatter points. But is still not getting the spiral look. I have only been using Houdini for three months. So still learning. Thank you. 1 Quote Link to comment Share on other sites More sharing options...
deniz Posted January 31, 2016 Share Posted January 31, 2016 (edited) you can use the "goldenspiral" and emit points from them, i made it with Arrays but there should be some posts about it on the sidefx forums and here, a tutorial from adam is on cmivfx maybe helpful http://www.toadstorm.com/blog/?p=255 http://forums.odforce.net/topic/11780-creating-a-nebula-simulation-from-a-photograph/ spiral.hipnc Edited January 31, 2016 by deniz 1 Quote Link to comment Share on other sites More sharing options...
bifrost Posted February 1, 2016 Share Posted February 1, 2016 When someone says that they are making a Galaxy in 3D, only one thing comes to my mind. Good luck with your project. Sorry can't help you more with this. Quote Link to comment Share on other sites More sharing options...
Thein Win Posted February 1, 2016 Author Share Posted February 1, 2016 Thx for the reply. I have gone through the tutorials and links you all have given to me. They are quite helpful. I will soon be start working on it and hopefully will also upload up on this page to get some feedbacks. If any of you have anything related to galaxy or nebula, and particles or krakatoa like effects done in houdini please share me videos, files or links. It will be so nice. This is the link to my film project work thread - http://www.3dhit.co.uk/index.php?showtopic=27778 please go through it if u have time Type of effects I want to achieve - https://vimeo.com/106800693 https://www.youtube.com/watch?v=JHRiaKEYeis Thank you so much Quote Link to comment Share on other sites More sharing options...
mestela Posted February 2, 2016 Share Posted February 2, 2016 Hacky attempt based on that BUF video. Also tried throwing together a quick attempt to copy galaxy and star sprites onto the shape (and abuse the OGL viewport stuff to make them additive), sorta works, sorta doesn't. Anyway, might give you some ideas. galaxy_v01.hipnc 1 Quote Link to comment Share on other sites More sharing options...
Thein Win Posted February 5, 2016 Author Share Posted February 5, 2016 Wow thanks Matt. Thats amazing technique. Quote Link to comment Share on other sites More sharing options...
Thein Win Posted March 13, 2016 Author Share Posted March 13, 2016 Hi I haven't touched the galaxy for a while and now I am back. I want to continue improve. Need Help! Below I have attached four pictures. The first one is what I have done so far. The rest three is what I am aiming to achieve. What I have done is more like a base. So rite now I want to add some more elements to it. As you can see in those pictures there are layers of particles, which I have kinda done, and smoke or gas and those pinkish nerves like gas. Can anyone please help me on how to get those nerve like pink gas as you can see on the pictures. I am not so good with pyro stuff. The rest three pictures are from Cosmos documentary. I really want the quality just like those from the pictures. I have also provided my hip file. Could you please look inside and see how else can I improve my galaxy. Thank you so much! Pink_Galaxy.hipnc Quote Link to comment Share on other sites More sharing options...
Thein Win Posted March 15, 2016 Author Share Posted March 15, 2016 Can anyone help me on how to drive the smoke in spiral like in the picture below? Quote Link to comment Share on other sites More sharing options...
Atom Posted March 16, 2016 Share Posted March 16, 2016 You could try plugging your points into the Buckshot Smoke Trail generator? 1 Quote Link to comment Share on other sites More sharing options...
Malf Posted March 16, 2016 Share Posted March 16, 2016 Hi Thein, I hope you have had some more luck with this galaxy that your trying to create. Unless you need to see large dynamic motion in your shots you could generate this volume procedurally through some VOPS potentially. Here is a hip file which has something started in it along these lines, it's currently all math driven but I'm sure you could find some ways to control it nicely. For the final render I would lean towards doing the same operations but inside a volume procedural so that your not limited in resolution.Hope this helps.Cheers Jake. galaxyVolumeSwirl.hipnc 1 Quote Link to comment Share on other sites More sharing options...
djiki Posted March 16, 2016 Share Posted March 16, 2016 If you need galaxy formation in time and you have a lot of computing power you can use NBody sim solver with real phisical parameters to generate galaxy. In attached scene there is only 65K points. For more realistic results you probably need several millions of them. NBody sim is done inside loop of POP VOP (Houdini guys it would be nice if someone code it to run on GPU and include it in new release of Houdini as NBody solver). In the attached scene, period of several billions of years is scaled to several hundred frames. A few parameters control whole sim, time step, cluster scale, velocity scale, drag, etc. Nice thing with this method is you don't have to worry about collisions of two or more galaxies (There is not enough computing power on the world to calc that ..... ) Seriously... take another sphere inside same SOP and generate point cloud on it like it was done with first, move it on the scene several units away of the first one by transform SOP, merge those two point clouds and connect it in pop network. After merge it is actually single point cloud but some points have offset in space. Run sim and enjoy in spectacular two galaxies collision. They will merge eventually in time (and space). https://mega.nz/#!3JwhhZoZ!X6WJn9dPvxUAC2BqwbD1KevluzzRa5Nt1Nm3DAguIz8 When you get desired look, convert that point cloud in volume and you are done. Cheers 4 Quote Link to comment Share on other sites More sharing options...
Thein Win Posted March 17, 2016 Author Share Posted March 17, 2016 Wow, thank you everyone. You guys are amazing. After looking into some of the techniques you all have suggested I think I am going to go procedurally, like Jacob suggested. I think it works really well since is faster to generate and my galaxy wont be in motion. Once again thank you all for taking time to help me out. Quote Link to comment Share on other sites More sharing options...
Iskander Posted November 3, 2017 Share Posted November 3, 2017 (edited) 2djiki upd file nbody_opencl.hipnc Edited November 4, 2017 by Iskander not best interpretation 1 Quote Link to comment Share on other sites More sharing options...
dyei nightmare Posted November 3, 2017 Share Posted November 3, 2017 (edited) im in a project where i have to do a galaxy too, i did some tests, lemme se what i have so far on that matter Edited November 3, 2017 by dyei nightmare Quote Link to comment Share on other sites More sharing options...
djiki Posted November 18, 2017 Share Posted November 18, 2017 Thx Iskander. Really nice job. I've got 1.4 FPS on my laptop with your original scene (without trail node calculation) and decide to do optimization of kernel code with some tricks and reached to 3.4 FPS (2.5 times faster). What I did is: - moved calculation of softening_squared outside of kernel so it is precomputed once and passed to kernel - removed double index and multiplication of second index for proper position in float3 array by using vload3 and vstore3 to fetch and store vector data from GPU memory to register and vice versa - used optimized vector routines in calculus instead calculating values per each vector component - provided extra arrays to store newpos and newvel vector values and - used them in writeBack kernel to store values back to attributes instead of using extra pointwrangle node Here is modified version nbody_opencl_modified.hipnc Cheers and thank again 3 Quote Link to comment Share on other sites More sharing options...
Brazen Posted November 21, 2017 Share Posted November 21, 2017 Just came across a website of a vfx artist, name's Teun van Der Zalm. He creates beautiful nebulae inside Houdini, check it out, it's very inspirational : https://vimeo.com/teunvanderzalm Quote Link to comment Share on other sites More sharing options...
874604650 Posted June 30, 2018 Share Posted June 30, 2018 On 2017/11/21 at 6:29 PM, Brazen said: Just came across a website of a vfx artist, name's Teun van Der Zalm. He creates beautiful nebulae inside Houdini, check it out, it's very inspirational : https://vimeo.com/teunvanderzalm it's realy beautiful but ~how to do it~? Quote Link to comment Share on other sites More sharing options...
CiclopeTuerto Posted January 16, 2020 Share Posted January 16, 2020 On 16/3/2016 at 7:13 PM, djiki said: If you need galaxy formation in time and you have a lot of computing power you can use NBody sim solver with real phisical parameters to generate galaxy. In attached scene there is only 65K points. For more realistic results you probably need several millions of them. NBody sim is done inside loop of POP VOP (Houdini guys it would be nice if someone code it to run on GPU and include it in new release of Houdini as NBody solver). In the attached scene, period of several billions of years is scaled to several hundred frames. A few parameters control whole sim, time step, cluster scale, velocity scale, drag, etc. Nice thing with this method is you don't have to worry about collisions of two or more galaxies (There is not enough computing power on the world to calc that ..... ) Seriously... take another sphere inside same SOP and generate point cloud on it like it was done with first, move it on the scene several units away of the first one by transform SOP, merge those two point clouds and connect it in pop network. After merge it is actually single point cloud but some points have offset in space. Run sim and enjoy in spectacular two galaxies collision. They will merge eventually in time (and space). https://mega.nz/#!3JwhhZoZ!X6WJn9dPvxUAC2BqwbD1KevluzzRa5Nt1Nm3DAguIz8 When you get desired look, convert that point cloud in volume and you are done. Cheers @djiki Hello, I've been trying to simulate something like this and export as vdb. This simulation is perfect for what I need, but is non-commercial. Is there any posibility I can get or buy you the commercial file? It would be very helpfull. Thanks! Quote Link to comment Share on other sites More sharing options...
uupsayaya Posted April 30 Share Posted April 30 Hi guys, I also need galaxy for a project, but I can't access the files you sent, could you please send them once again? Quote Link to comment Share on other sites More sharing options...
Librarian Posted April 30 Share Posted April 30 @uupsayaya just search Nebula Karma Shader XPU on duckduckgo endless HDA and files. 1 Quote Link to comment Share on other sites More sharing options...
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