ThomasPara
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Thats because your current_pos always get set to (0,0,0) Since you already have placed your point based on a vector, you dont need to "figure out" that vector again, it will only become the same vector. You can just offset with the same vector over and over again. You can then use the function "sample_direction_cone()" to vary your vector.
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Resample each primitive separately
ThomasPara replied to bronnikovm's topic in General Houdini Questions
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Create rotation control for polywire
ThomasPara replied to ejr32123's topic in General Houdini Questions
The setup breaks if you move it outside of origo. Did some minor changes to it. orient_polywire_sweep_fix.hipnc -
thanks, np
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leaves_fix.hiplc
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You cant import attributes from points that are created in the same wrangle, you will only get values from the wrangle above. And if you want to store attributes to a point you create you need to use the handle you have created. ex: setpointattrib(0,"attrib",newpoint,value,"set"); I think you might have been overthinking this one. vector up = set(0,1,0); vector this_pos = @P; int samples = chi("samples"); for(int i = 0;i<samples;i++){ this_pos += up*chf("lift"); int newpoint = addpoint(0,this_pos); } You can use this as base
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Prevent duplicate lines while connecting nearpoints()
ThomasPara replied to Krion's topic in Scripting
You can make new primitives based on the points you already have. Connect them all and then compare if you have duplicates. Sometimes you have to do operations over several wrangles. NoDuplicates_01.hip -
You can make the particle field yourself and then source that. PaintBlob_fix.hipnc
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Yes i understand, its not an attack on the solution(s). Its more the idea of cutting a segment several times without adding points. Since both metodes shown here (from my understanding) only can cut once between two points.
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Did an experiment with subsampling the curve instead of adding extreme amounts of points to get precision. The downside is that you cant predefine the cuts with your own attribute. clip_by_noise.hiplc
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vex What is the difference between npoints() and point()?
ThomasPara replied to RustyMac2020's topic in Scripting
npoints() gives you the number of points the input have. point() can give you an attribute value from a specific point. If you write the function in vex you can put your mouse over the function and hit f1, then a helpcard will tell you what it does. -
Instanced mesh orientation along curve (help!)
ThomasPara replied to prekabreki's topic in General Houdini Questions
int primpts[] = primpoints(0,@primnum); matrix3 m = ident(); //here you could use your own base matrix foreach(int index;int i;primpts){ //create direction vector, can be replaced by a predefined vector int forward = 1; if(index == len(primpts)-1){ forward = -1; } vector this_pos = point(0,"P",i); vector next_pos = point(0,"P",primpts[index]+forward); vector dir = normalize(next_pos-this_pos)*forward; setpointattrib(0,"dir",i,dir,"set"); //align matrix vector matrix_z = set(getcomp(m,2,0),getcomp(m,2,1),getcomp(m,2,2)); matrix_z = normalize(matrix_z); float angle = acos(dot(matrix_z,dir)); vector axis = normalize(cross(matrix_z,dir)); rotate(m,angle,axis); //convert to orient vector4 orient = quaternion(m); setpointattrib(0,"orient",i,orient,"set"); } Put this code in a primitive wrangle and you will have parallel transport, you can evolve this into a bigger asset. -
Interesting, do you use intrinsic uvs or do you create your own uv for the carve position? (or is this a question i have to pay for). Is it 10x faster than the carve sop if you dont want per primitive controll?
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Your vex solution doesnt work as intended. But a reverse sop should do the trick or you could use this. //run over primitives and just add the primitives you need to reverse to a group int primpts[] = primpoints(0,@primnum); primpts = reverse(primpts); foreach(int index;int i;primpts){ setprimvertex(0,@primnum,index,i); }
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You can use the cluster id as a piece attribute in the foreach network, and then run over points.
