sphirus Posted October 1, 2010 Share Posted October 1, 2010 Hi, I need some help in particles. I'm currently doing the effects the particles forming the building shape and after awhile the particles will fall down procedurally by the affection of the gravity. With the help of "attributetransfer" node, I actually did the front part. But somehow the later part actually not what i want because the particles still birth at the group place. I'm not sure I'm saying the right thing so will attach my file here. New to houdini, need help building_form.hipnc Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 2, 2010 Author Share Posted October 2, 2010 Hi, I need some help in particles. I'm currently doing the effects the particles forming the building shape and after awhile the particles will fall down procedurally by the affection of the gravity. With the help of "attributetransfer" node, I actually did the front part. But somehow the later part actually not what i want because the particles still birth at the group place. I'm not sure I'm saying the right thing so will attach my file here. New to houdini, need help building_form.hipnc anyone can help me? Quote Link to comment Share on other sites More sharing options...
tmdag Posted October 2, 2010 Share Posted October 2, 2010 Use Impulse Birth if u don't want constant particle creation OR use if() expression to stop birth of particles in desired frame. Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 2, 2010 Author Share Posted October 2, 2010 Use Impulse Birth if u don't want constant particle creation OR use if() expression to stop birth of particles in desired frame. Actually i did use the impulse birth but the group that i use to emit the particles still doing the same thing(emit particles). I use "$NPT" in it. What I'm doing in my file is the particle will emit on the surface first. Later, I use "attributeTransfer" node to color the particles in blue. After that, I create a group sop to collect the blue point and append a pop net to it. This pop net will use my group point to emit particles. And the delete node will connect to it also to delete that group point. So, the result should be the particles become blue and disappear and pop net emit particles on the disappear place. But, somehow after my group all be deleted but my particles still emit at the birth place. How can I control the particles just emit once? Thanks Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 3, 2010 Author Share Posted October 3, 2010 Actually i did use the impulse birth but the group that i use to emit the particles still doing the same thing(emit particles). I use "$NPT" in it. What I'm doing in my file is the particle will emit on the surface first. Later, I use "attributeTransfer" node to color the particles in blue. After that, I create a group sop to collect the blue point and append a pop net to it. This pop net will use my group point to emit particles. And the delete node will connect to it also to delete that group point. So, the result should be the particles become blue and disappear and pop net emit particles on the disappear place. But, somehow after my group all be deleted but my particles still emit at the birth place. How can I control the particles just emit once? Thanks Anyone can help me on this improvement? Most appreciated Quote Link to comment Share on other sites More sharing options...
tmdag Posted October 3, 2010 Share Posted October 3, 2010 Actually i did use the impulse birth but the group that i use to emit the particles still doing the same thing(emit particles). I use "$NPT" in it. First, yes, so you are using $NPT (Number of particles) ... in "Const. Birth Rate" so it's constantly emitting $NPT of particles. Second, You have two pop networks in Your tree (with $NPT as Constant birth rate), I'm little bit lost - which one u want to emit once? Besides, Wouldn't be easier to use this ball as collision for first pop network ? Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 4, 2010 Author Share Posted October 4, 2010 First, yes, so you are using $NPT (Number of particles) ... in "Const. Birth Rate" so it's constantly emitting $NPT of particles. Second, You have two pop networks in Your tree (with $NPT as Constant birth rate), I'm little bit lost - which one u want to emit once? Besides, Wouldn't be easier to use this ball as collision for first pop network ? the second pop network is what i want to emit once actually. What do u mean using the ball as collision? I think the result will be different. Quote Link to comment Share on other sites More sharing options...
~nature~ Posted October 9, 2010 Share Posted October 9, 2010 Here is the simple file I guess demonstrate your idea, hope it helps. particleFall.hipnc Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 14, 2010 Author Share Posted October 14, 2010 Here is the simple file I guess demonstrate your idea, hope it helps. Hi, nature, thanks for your help. But once I open your file, it caused fatal error and closed automatically. I hope you can attach your file again. Thanks a lot. Quote Link to comment Share on other sites More sharing options...
~nature~ Posted October 14, 2010 Share Posted October 14, 2010 Hi, nature, thanks for your help. But once I open your file, it caused fatal error and closed automatically. I hope you can attach your file again. Thanks a lot. I'm sorry about it, This file was created in Houdini 11, so you need the version 11 to open it. Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 14, 2010 Author Share Posted October 14, 2010 I'm sorry about it, This file was created in Houdini 11, so you need the version 11 to open it. Ok, I will try on it. Thanks for help. Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 15, 2010 Author Share Posted October 15, 2010 Ok, I will try on it. Thanks for help. Hi, nature. I'm still can't open your file even using houdini 11. The same problem was occured. Hope you attach your file again. Thanks Quote Link to comment Share on other sites More sharing options...
~nature~ Posted October 15, 2010 Share Posted October 15, 2010 Hi, nature. I'm still can't open your file even using houdini 11. The same problem was occured. Hope you attach your file again. Thanks Hi, sphirus, I cannot figure out why you cannot open my file, I actually download my own file from this post and open it without any problem. Anyway, I saved new copy here and the fundamental trick is "not use attrib transfer in SOPs but in POPs". If it still cannot solve your problem, you may check this post here The fundamental trick is the same. Hope all these can help you. cheers particleFall_odforce.hipnc Quote Link to comment Share on other sites More sharing options...
sphirus Posted October 21, 2010 Author Share Posted October 21, 2010 Hi, sphirus, I cannot figure out why you cannot open my file, I actually download my own file from this post and open it without any problem. Anyway, I saved new copy here and the fundamental trick is "not use attrib transfer in SOPs but in POPs". If it still cannot solve your problem, you may check this post here The fundamental trick is the same. Hope all these can help you. cheers Hi, nature. Thanks for your help. But I still cannot open your file. Can you describe your idea about "not use attrib transfer in SOPs but in POPs" here? I think if you can add some screenshot of it will help me to understand. Most appreciated. Quote Link to comment Share on other sites More sharing options...
Emanuele Berti Posted October 29, 2010 Share Posted October 29, 2010 Hi Sphirus, I spotted two errors in your flow... 1-in your popnet3 instead of using $NPT/100 in Const. Birth Rate, write $NGRP/100 2-between xform2 and the attribtransfer1, put another color SOP and set the color to black (0,0,0) Hope that helps!!! Cheers, Emanuele Quote Link to comment Share on other sites More sharing options...
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