Pazuzu
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Everything posted by Pazuzu
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This microsolver helps you to define a field mask using standard DOPs relationships (using the merge DOP for example). You can define for example a source object mask to emit fuel or density using just relationships, so if you have many objects and connect those besides the smoke solver with a merge using source relationship mode, the gasbuildrelationshipmask will create a field representing the objects as a fog or SDF representation. Attached is an example file (one hip is better that a thousand words ) Cheers Alejandro gasbuildrelationshipmask.hip
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Ohhh Man I don't think so!! So much to learn still! DOP context is like a black Hole full of Chaos and Alternate Possibilities! Cheers!!
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You can control the pressure jump per particle with a scalar field as a factor for the surface-pressure field. Attached is a very raw example of it. I hope that helps! Cheers Alejandro pp_st.hip
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I think that you can simplify even more the code:
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Thanks for the info! Its possible to apply also as a remote worker? Or It should be in London? Thanks Alejandro
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Sure you can! The nice thing about pyro is that the combustion model is a post computation (but by default you can't accumulate divergence aka "Gas Release", because there is a cleaning before the combustion model), so you can create an ad-hoc scalar field to then sample your age out of your particles to use as a factor for the divergence to control the expansion/contraction of your sim in a per particle basis. But I think also that the divergence is not the only problem, I think you should also control or force the fuel to die with the same "age" field, to have even more control or shaping of your sim. Cheers! Alejandro
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One think that the diffusion filter misses right now is that it doesn't take into account the time increment of the system; But that can easily be implemented with a blended average technique in that sop solver. Cheers! Alejandro
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No Problem! Here is an example for diffusion and dissipation as the material gets closer to the collision object. I hope that this helps! Cheers! Alejandro dissipation_by_collision_proximity.hip
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The pcopen just give you a handle with the points sampled at a given radius; Then you can use another pc function like pcfilter to average the result of some data over the handle points, or you can use some pc combo functions like pciterate-pcimport to construct a loop over the handle. The pc arsenal is very usefull and is faster in some cases than using arrays. Cheers! Alejandro
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Nice changes! You don't need to define a new divergence volume if you want the divergence to work as it should. You only need to activate the field in the flip object, then define the divergence attribute on the particles directly. Regards filling faster, you can use the same rules for the collisionWeights to define the divergence and help the fluid gain volume when is inside the collision object, also you can create particles on demand when the fluid expands, so you can use reseeding for this or create your own dynamic setup for on demand particle generation. Here is a mod to the Jim's file that shows that, it will became unstable at the end mainly because of the volume gain, but you can animate the reseeding toggle and kill the divergence, or test the fluid volume against the volume of the collision object to deactivate the expansion, a more procedural solution. Finally one limitation on this collision weight technique is that if you use so much extrapolation the fluid will escape at the zone where the fluid stream is flowing, all of this is because of the fluid reconstruction with the gas particle to field. Hope that helps! Alejandro ap_collisionWeights_v001_jlim_FasterFilling.hiplc
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You can create an ad-hoc field out of your collision field, or make it directly in sops using your collision field. So you can extrapolate from the iso-contour to construct a mask to control a dissipation filter when the density is in proximity. I hope that this helps! Alejandro
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You're Welcome!!
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collisionWeights_v001.hip
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Here is the scene file that shows how to manipulate collision weights for an explicit control (rules) of how your particles collide. Enjoy! Alejandro
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Its all about playing with collision weights! This is totally possible! I did a modification to the Flip solver to do exactly this a year ago. I'll try try to search the file and send you an example. But basically you should do manipulate the collision weight per particle to control the collision behavior. So with just a simple rule like sampling the collision SDF you can test if you want to turn on or off your collision weight to let the particles collide or not with the objects boundary. Cheers! Alejandro
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Hi Huge! Please look at this tutorial that Ben Watts did sometime ago using my technique, is very very simple but powerful. Cheers!
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I think you can give speed variation to the propagation using a per point factor of aggregation on each iteration. That can give you faster or slow zones of accumulation, then you can use that factor to grow your instances in a more smooth way. I hope that this helps! Cheers!
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Really Nice Pavel! Thanks for sharing this!!!
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How to constraint voronoi fragments in a moving mesh?
Pazuzu replied to fco.contreras.cuevas's topic in General Houdini Questions
Here is a little correction to preserve your original fracture position. Cheers! Constraint Obj Test 02.hipnc -
More love to the small scale fluid pipeline (Rewriting of SPH solver and related microsolvers) New methods for the gas pipeline (incompressible Schrödinger flow for example)
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Try with this file! (asi puedes conseguir que se respeten las piezas voronoi) Cheers! Alejandro voronoi_grains.hip
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Really Nice Alvaro!!! Thanks Man!!! Gracias!!
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Yeah you can even use the ratio as a factor for the stiffness for example, that way the zones with more force will be more deform-able in few words; But as with everything is a matter of testing the best method / technique. Cheers! Alejandro
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Hi, You can try to inject some force in the geo normals direction; Also if you want to inject some variation in the inflation, you can use the ratio between each point velocity and the normal + some noise value to increase the ratio. Hope that this helps, Cheers! Alejandro
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When in a sim with millions of particles you left "on" the cache setting in the flip object.