Lucid many issues that need explanation

Posted by:thanulee
Data created:29 October 2016

Hi again :) instead of making long threads, here is a screencapture with how lucid behaves in my system. Idk if this is normal and im missing stuff, but i cant make use it in production like this. Any help appreciated.


ps. i apologise for the bad quality but u ll see clearly whats up :)

Download it for better quality, cheers

The only problem I see in the video is the inability to add the modifier from the toolbar. I cannot reproduce it here but I will try again on a different Max version.

If you just press simulate and play you will indeed get a different result from recording, this is by design. Recording evaluates the simulator one step at a time, with fixed steps. Playing it live can increment frames at arbitrary intervals to keep framerate constant. A better approach is to manually scrub the timeline.

Adding Flex Settings object will always modify the simulation if you don't have one in the scene yet. Without it default settings are used and Flex Settings changes these properties with whatever you have inside it. Try increasing the number of substeps and iterations for better results.

Marsel Khadiyev (Software Developer, EPHERE Inc.)

Great, glad i sorted those details out cause i was driving my self crazy.

Well the next thing and most important is that after many many tests on a single sphere, i cant find some settings that make the hair stop instead of bouncing forever. The more i add substeps or iterrations, the more they bounce. Can u provide me a scene with hair on a sphere, just dropping and behaving proper without needing 1000 frames to stop moving (and not all of em some still move like crazy).
Cause i like the "default" but i ll probably need tweak a bit, and adding flex object just completely ruins the first setup.

Thanks a lot Marcel!

Have you tried increasing the drag/damping values in Flex Settings object?

Marsel Khadiyev (Software Developer, EPHERE Inc.)

Ya i think i added some ridiculous number in drag, like 100 cause i coudlnt see any difference at all. Do these parameters work with hair? I ll try again with a fresh eye and get back to u! What damping does practically and what values work for both drag and damp usually? thanks

Finally! Damping seems to get the job done! Rest parameters do not do nothing at first glance.
Still there is this issue with roots bending no reason. Even the roots at the bottom of the sphere are bending. See image below. There must be a setting somewhere preveting this from falling proper, cause its the same distance again around 5.5 cm

Attached Files:

>lucid+hair+root+issue.JPG (144480 bytes),

Have you tried displaying as particles to see what the lattice looks like?

Also have you tried increasing/decreasing hair segment count?

Marsel Khadiyev (Software Developer, EPHERE Inc.)

Seems fine, i ll post some screenshots to show u.

Sounds good, thank you!

Marsel Khadiyev (Software Developer, EPHERE Inc.)

Here are some screenshots with particles. Hair segment do not help the distance is there. And i made a render and when the sphere spins, hair look weird. I attach u the scene in case u wanna investigate this. Thanks a lot Marcel!

Hi Thanos,

Please see attached scene, I think it gives better results in terms of simulation with less damping. The issue with roots sticking out is fundamental, Ox Dynamics does the same thing. The first segment in the hair needs to point outwards, otherwise the hair would always collide with the distribution mesh. The scale and number of segments should reduce this distance though.

Attached Files:

>gamw+to+xristo+lucid+2.7z (81320 bytes),

Marsel Khadiyev (Software Developer, EPHERE Inc.)

Thank u very much for all the help Marcel! i ll give it a closer look!

Sorry for getting late back at this, but can u convert the scene into max 2016? ty

Sure, 2016 scene is attached

Attached Files:

>gamw_to_xristo_lucid_2016.7z (96647 bytes),

Marsel Khadiyev (Software Developer, EPHERE Inc.)