Atom Posted August 31, 2015 Share Posted August 31, 2015 Hi All, I ran across a couple of interesting pictures on CGSociety that were created with Houdini. Does anyone know how to approach the modeling of such results? Also... 1 Quote Link to comment Share on other sites More sharing options...
michael Posted August 31, 2015 Share Posted August 31, 2015 build a curve on your existing geo (many ways...) re-sample make a line, copy spheres to the two end points then copy the result to each point (perpendicularly) of the curve twist the curve profit? Quote Link to comment Share on other sites More sharing options...
konstantin magnus Posted August 31, 2015 Share Posted August 31, 2015 (edited) hi atom, cool references! i think the sweep sop does most of the job.. dna.hiplc Edited August 31, 2015 by konstantin magnus Quote Link to comment Share on other sites More sharing options...
jrockstad Posted August 31, 2015 Share Posted August 31, 2015 The examples posted in this thread may be of interest as well. I was searching for examples of procedural rope models a little while back when I needed to make an intertwining lightning effect, and was able to adapt the setup posted by Visual Cortex Lab to suit my needs pretty easily. Quote Link to comment Share on other sites More sharing options...
Atom Posted September 1, 2015 Author Share Posted September 1, 2015 (edited) Thanks for the feedback and for the HIP example Konstantin. I was just playing around with particle trails as a curve the other day. I plugged it into your DNA strand and now my scene leaves a trail of DNA strands as the emitter line tumbles through space. I guess other experiments might include using a RAY sop to project a curve upon the surface of a model or scaling the strand by it's length. Figure out how to analyze a model and extract curve sets from existing geometry... The rope link is helpful as well. Twizzler DNA anyone? In Konstantin's HIP file there were a couple of unconnected nodes where a single loop cut was selected in the test pighead geometry. I used eetu's wireframe recipe, here, to create values to feed to the DNA sweep. This is my first attempt on geometry. Kind of more methodical and uniform compared to the artistic results in the first post images. Does anyone know how to convert all loopcuts in geometry into individual curves? Manually creating a bunch of loop cuts as groups then routing them through three different DNA generators. This allows each group (large, medium, small) to have their own sweep parameters, resample and radi for the sphere and stick. This is the pighead geometry up close. Here is a result using Stephan's swirly technique to create the source curves over time. Then feed those curves to the DNA generator. ap_line_DNA_trails_1a.hipnc Edited September 3, 2015 by Atom 2 Quote Link to comment Share on other sites More sharing options...
Atom Posted September 3, 2015 Author Share Posted September 3, 2015 (edited) I am still trying to work this effect out. I have re-written then DNA generator to try to make use of the length of the line for scaling. I measure the line using the $CR method and that allows me to use the position along the line for COPY/STAMPING of rotation and scale. The scaling is COS driven so it appears larger in the middle of the line. However, I think I have the rotation off, it does not look as 'DNA' to me as the SWEEP/TWIST method that Konstantin presented. How would I factor in/fake the backbone input in my COPY/STAMP setup? Or correct the rotation expression? ap_scalable_DNA_trails_1b.hipnc Edited September 3, 2015 by Atom Quote Link to comment Share on other sites More sharing options...
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