Houdini | Use a Ramp to Drive an Attribute

This video shares a quick example of using a Ramp to Drive an attribute in Houdini.

[@vladartiomav2473]

whaaaat!? 🤯🤯🤯 The more I use Houdini, the more I'm in love with it. And your tutorials of course 🙃

[@Pixelfondue]

Great to hear!

[@salinaywy6965]

This is what i am looking for ! thanks for the useful tutorial in just less than 2 mins !

[@Pixelfondue]

Good to hear

[@vl1697]

I've watched most of the Modo ones and I'm glad PF is opening a new chapter.

[@Pixelfondue]

Glad to hear you are enjoying the content... More to come

[@TomCushwa]

Cool Thanks. A ramp is much more useful if you add a multiplier to the ramp to make the radius larger or smaller. You can do that by adding a float slider to the parameter interface( like you added the ramp) and then use the following code in the wire Radius. chramp("rampAdj",$BBY,0) * ch("rampAdjMult") Your individual names can be different than "rampAdj" etc, but that is the idea. Then save all this as a preset so you do not have to do it every time.

[@Pixelfondue]

Good tip!

[@cgzero7]

Wow, this is way simpler than my way. I was using VEX and VOPs before, haha. Thanks William!

[@Pixelfondue]

I learned how to do this with Vex as well and discovered a Ramp node that I could use with Point VOP but need to explore that whole area of Houdini. Excited about VOPs... so many thing to learn. Keep reminding myself Im only a week in and I dont have to learn it all right away.... but I want to :)

[@gregleuenberger]

@@Pixelfondue This is one of those things where I'm sure it's good to do it via Point VOP in that you need to 'get' VOPs to 'get' Houdini...but man I wish you could just right click an attribute to add a ramp then pick then input from a dropdown (or something like that) MODO's Shader tree does such a great job giving a bunch of 'rampable' presets that you don't have to rig up.

[@Pixelfondue]

@@gregleuenberger Agreed. I'm looking forward to diving deeper and then at some point creates scripts that automate alot of this stuff.

[@gregleuenberger]

@@Pixelfondue You would be a mighty hero if you could accomplish that, lol. I mean, even if you like VOPs and know what you're doing - it's nice to just click around.

[@christianvolkner2028]

@@Pixelfondue with Houdini assets you can easily create a tool and share that with others, even now at the very start. It only takes a few minutes to create one and you already have a searchable polywire node with gradient included, presets and all the controls you wish for😉

[@thehomedepothouseplant9986]

Another great video! Thank you

[@Pixelfondue]

Glad you enjoyed it!

[@tom.konxompax]

Thank you so much ! ❤

[@Pixelfondue]

You're welcome 😊

[@No_Plastic]

Amazing thank you. I tried this expression: chramp("wradius",$BBY,0) on sphere's uniform scale and the sphere disappeared once i executed the command and gave me this error: Unable to evaluate expression (Undefined variable (/obj/geo1/sphere1/scale)). Am I doing something wrong? Thanks a lot

[@im4999]

Total beginner here. Sorry if this question is stupid but would it be possible to control displacement/mountain in a similar way? I tried control "amplitude" with this trick but it shows some errors. Assuming that this way is impossible, how can I control areas of the geometry locally over the time? For example, the rbdmaterial_fracture can be controlled by bounding box. I would appreciate any tips.

[@tgroppi]

Merci Floyd

[@Pixelfondue]

De rien

[@tgroppi]

@@Pixelfondue kzbin.info/www/bejne/qqS5YnlpfN2iorM&ab_channel=JunichiroHorikawa

[@carlosrivadulla8903]

if u click the gear icon above the ramp u ll get some handy presets.

[@Pixelfondue]

Nice! Will definitely explore the presets!

[@ojisan4220]

Thanks. What is $BBY equivalent in "modern VEX" in this case?

[@Pixelfondue]

www.sidefx.com/docs/houdini/vex/functions/relbbox.html

[@g8610g]

How does this work with a circular path to scale along the path instead of absolute XYZ?

[@Pixelfondue]

can you share an example?

[@g8610g]

@@Pixelfondue A fisherman reeling in the biggest catch you have ever seen. Bending its rod like an upside down U. The method wouldnt proportionally scale the with of the rods diameter along its lenght

[@dylaninthemovies]

Wait, why the muppet?

[@Pixelfondue]

Why not?

[@dylaninthemovies]

@@Pixelfondue that's the spirit!