Aleksandr Kirichenko

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Advice about what to practice in Houdini Aug. 4, 2021, 12:19 p.m.

Good choice Also I found that knowledge of VEX then will help you to feel yourself more confident in VOPs, as well as, to make a distinction between VOPs nodes which are directly replicating VEX functions and which are unique or high-level/extended wrappers for them.

Advice about what to practice in Houdini Aug. 4, 2021, 7:13 a.m.

I've recently had a lot of fun playing with the new fancy features:
Pyro minimal solver -
https://www.sidefx.com/tutorials/minimal-opencl-solver-part-01-explosion/ [www.sidefx.com]
RBD guided simulation -
https://www.sidefx.com/docs/houdini/destruction/guidedsims.html [www.sidefx.com]
Vellum brush along with old but still relevant vellum clothing tutorial -
https://www.sidefx.com/tutorials/november-thug-vellum-with-sara-rascon/ [www.sidefx.com]

If you want to get serious about vops and vex fundamentals I'd recommend:
Vex for algorithmic design
https://www.youtube.com/watch?v=V5i6KM_-8X0&list=PLzRzqTjuGIDhiXsP0hN3qBxAZ6lkVfGDI [www.youtube.com]
Hipflask courses for VOPs, parameters, curves logic:
https://www.hipflask.how/courses [www.hipflask.how]

How to Deleting Cache Files Generated by ROP with Python July 29, 2021, 5:27 p.m.

You can try to utilize TOP nodes to do the job. The reason for this, if you rendering/saving files in TOPs, you can use the @pdg_output attribute to remove those files by TOP File remove node and don't parse paths, filenames or frames manually.
I'm not very confident with PDG at the moment to give you a complete example, but you can take a look at the last hip file at the topic: https://www.sidefx.com/forum/topic/62404/?page=1#post-282398 [www.sidefx.com]