Animate uniform Scaling with Drivers

Sometimes we want to ani­mate a trans­for­ma­tion uni­form­ly in Blender but we find it’s divid­ed into dif­fer­ent chan­nels. In today’s tip we’ll cre­ate a dri­ver to ani­mate mul­ti­ple chan­nels from one.

First ani­mate the scale of your object as usu­al, or just add a cou­ple of  keyframes to get some ani­ma­tion data. Decide which chan­nel you want to animate.

It can be any of them, I usu­al­ly choose X. Now go into the dopesheet edi­tor and delete the oth­er two chan­nels (Y and Z in this case). Now we can add dri­vers to them. Open the prop­er­ties bar and ctrl+click on the Y scale to type a val­ue. Type # fol­lowed by this:['My Object'].scale.x

Replace “My Object” with the name of your object but don’t remove the quotes though. You can check it’s name by select­ing it and look­ing at the bot­tom of the 3D view or in which one gets select­ed in the out­lin­er. Do the same for the Z val­ue. The hash (#) is the short­hand for quick­ly adding dri­vers in Blender, you could also right-click and select “add sin­gle dri­ver”. Once a dri­ver is added you don’t need to type the hash anymore.

Now you can dri­ve the scale val­ues (and F‑Curve) for Y and Z using X. You can also do more advanced things like using for­mu­las and math func­tions. For instance if you want­ed your object’s height to be half it’s width, your Z scale dri­ver would be:['My Object'].scale.x / 2

The sky is the lim­it with dri­vers, not only for cre­ative or exper­i­men­tal uses but also to workaround issues like this. So Learn some Python and have fun.

All the posts you can read
TutorialsAnimation, Blender, Drivers, Python, Tip19.10.2020

No comments yet

Leave a Reply

Your email address will not be published.