tamagochy
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change timescale to .2 or .1 in gasturbulence and pulse set to 5 or higher
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you can create ramp in sop level and use in shader pointwrangle vector bbx = relbbox(0,@P); f@ramp = chramp("ramp",bbx.y);
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in dop paste strat frame the frame before impact, after meshing you can transfer uvs
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convert your object to FLIP before impact, use shelf tool flip fluid from object.
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if you are using gasdisturbance node you no need gasmatchfield. In control field tab you can enable ramp curve and fit influence values to disable disturbance in low speed areas
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Control field always should be a scalar value, because its used like multiplier for final influence... unlock gas disturbance node go disturb_vectorfield, find control_field , change to vector and add length after it. And you can use now vel as control field )
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the problem is constraint obj should be animated. Everything is working well if constraints obj static or animated before dop, but I need to create constraint obj inside DOP from part of the sim obj in some frame and animate from this frame... Example it's man grab rope blowing on the wind. And I got animation and need to fit simulation to this animation.
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you should play with angle and force thresholds, and mass of the stone and wood.
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Break constraints problem setting attributes at sop level
tamagochy replied to SphericalCow's topic in Effects
hard constraint use force only. Try this if (@constraint_name == "hard" && length(@force)>1000){ s@constraint_name = "hard_broken"; } or I use this one if(@constraint_name == "hard"&& length(@force)>1000) removeprim(0,@primnum,0); Glue constraint used strength attribute to brake -
Hi all, I need grab wire sim rope in some frame. Wire constraints point to point, so position of the constraint points should be the same with rope's one in that frame. I try to use sop solver to import geometry, isolate needed points and then use position dop to update position of the constraint obj but its doesn't work. I need to do it inside DOP, because manual animation its a hell with sim objects. So I need to dynamically change position of the constraint obj, or create wire constraint, based on sim points of the rope in some frame inside DOP. Is it possible?
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Orthographic align and move back to original position
tamagochy replied to sjowol's topic in General Houdini Questions
try this one vector edge_dirs[]; float edge_lengths[]; foreach(int nb; neighbours(0,@ptnum)){ vector pos = point(0,"P",nb); vector delta = pos-@P; append(edge_dirs,normalize(delta)); append(edge_lenghts, length(delta)); } edge_dirs = reorder(edge_dirs,argsort(edge_lengths)); vector x = edge_dirs[-2]; vector y = edge_dirs[-3]; vector z = edge_dirs[-1]; //longest 3@rot = set(x,y,z); then find point you like and assign matrix from it for all points and make this: @P *= invert(3@rot); to back to initial position just @P *= 3@rot; -
Try group unshared edge -> isolate them -> sort pts - > then use foreach to get edge vectors
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Bad idea to change scale in hip preferences, better use transform node instead.
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better create wind in sop and then import in dop as force. Much ease to control...
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check the scale of the objects. If objects bidder then in real life you should increase all forces and masses in sim to fit for real life. Basically work-flow very simple: before dop your objects should be in real scale, then you can scale up for 2 or 3 times objects before dop, to avoid weird behaviour of the very small pieces, and you should scale gravity and all other forces in DOP, as well as mass or density of the sim objs, the same value. After sim scale down. Or try to sim in real size firstly.
