Game Editing > 3D Modeling & Content Creation

3D Modeling WIP Topic

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kat:
Not sure how realistic a representation you're after there Ratty but the tentacles of jellyfish tend to originate from the central mass.. where you've got them they'd be problematic for propulsion (they'll be a pain to animate as well without looking a little odd - you might have additional issues with 'seams' if you make the jelly transparent because you'd have to figure out how to hide the join between body and tentacle). Other than that, pretty interesting.

ratty redemption [RIP]:
thanks for the advise kat. previous to beginning the modeling i had studied several videos on youtube of how real jelly fish were constructed and propelled themselves. so i had made the conscious decision to have my tentacles growing out of the dome area, partly to emphasize these are alien, but i hadn't considered it being problematic for the reasons you drew my attention to.

i'm currently watching some more video tutorials on rigging in 2.62 as it's several years since i first attempted to rig and animate a model with bones. if when i next work on my model, i run into too many problems i'll simply relocate the tentacles as you suggest.

any more advise is welcome as always.

ratty redemption [RIP]:
thanks to kat, i decided to test the tentacles being attached to the inner part of the creature, and i think i prefer this version. plus it looks more like an earth jellyfish, which can't be a bad thing.

the last image shows the uv stretching which i forgot to test previously, i'm reasonably pleased with the results of that so far.

kat:
When you concept ideas up they generally have to have some grounding in what we understand as reality. If the tentacles were attached to the outer rim they would result in 'drag', they would likely make movement impracticable, because if you think about the motion, the outer carapace moves a large distance in order to push the 'fluid' out from under it in enough volume to create the necessary forward motion. This would mean if the tentacles draped some distance behind they would potentially suffer 'stress' due to the amount of movement they're be required to do to 'catch up' as they are forcibly pulled thru the 'fluid' the creatures is swimming through. That's why the generally attach to the body mesh, it leaves them free to dangle and drape behind without causing problems for forward motion.

That's a long winded way of saying 'where' they are placed isn't so much important as 'why', one could imagine creatures living on gas planets being structured in similar ways to the way they are on earth simply through the practicalities of fluid dynamics - shapes may change due to differences in 'fluid' density, but would that necessarily mean they would be that vastly different in principle of motion?.

Interesting creatures jellyfish .. lol

ratty redemption [RIP]:
very cool, i recently watched a couple of short documentaries on jellyfish and those didn't explain how the creatures actually propelled themselves, so what you said makes a lot of sense, thanks very much kat.

also my jellyfish 'swim' in both liquid and gas, as in the case of my first animation, where i've already rendered the back grounds, based on some previous abstract art i did years ago using psychedelic procedural generated clouds in blender. i might oneday recreate the gas/clouds with particle physics but for now i'm just faking it, he he.

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