Shut (WIP, jam)

ArDanZ11

xyz Game looks really cool

xyz

A short video of procedural tentacle animation system used for enemy limbs.

The system uses piecewise circular arc curve with tangential arcs whose curvature radii are animated with some phase shift. The whole thing is fully procedural and contained with a single function call in a vertex shader that can deform any cylindirically shaped mesh.

The video shows twiddling some parameters in real time.

Gowydot

xyz

Amazing! this has been on my wanting to learn list for awhile now. Gotta get into it when I'm free from other stuffs.

kuligs2

xyz still at some swings and curls it overlaps on itself... real testicle wouldnt overlap. Still interesting.

kuligs2

xyz someone made something similar in 2d

xyz

kuligs2 still at some swings and curls it overlaps on itself... real testicle wouldnt overlap. Still interesting.

Why would it not overlap? It's an effect, not a physics simulation. There's nothing there to prevent overlaps, except proper adjustment of parameters.

kuligs2

xyz i was thinking more in "realistic" terms, overlaping breaks the illusion and just brings you back to the "oh, its just a game" rather than, "its ALIVE!" type of emotion.

xyz

kuligs2 Well the video is demonstrating the technical side of things. It's up to an artist to tweak the system to deliver a plausible illusion. With proper setting of thickness, angle amplitudes and sideways slant - no overlap can ever happen. There are plenty of parameters to play with. In the actual game I'm rendering this mainly as black silhouettes, so even if there was some overlap, it wouldn't really be noticeable.

The interesting thing is that if the calculation is run on the cpu side instead of completely in shader, a series of spherical colliders can easily be placed along the length, turning it into something quite interactable.

I also managed to add an iterative IK system similar to FABRIK. It works surprisingly well. At first I though the circular arc chain constrained by tangentiality and curvature would have very limited reachability. Turns out it can easily reach any point in range. My little IK solver converges quite fast towards a stable solution. The algorithm itself is even somewhat simpler than FABRIK, while keeping the beautiful smoothness of circular arcs.

xyz

kuligs2 Not really. This is standard line segment FABRIK with some sine offset on top of it. That method can't do nice smooth curls over 180 degs and the ik chain of linear segments tends to form choppy unpredictable structures because it's controlled only by a single target point. Low res pixelation kinda masks those problems. It requires many points to appear somewhat smooth but the more points you add the more uncontrollable it gets. It's also not stateless i.e. not truly procedural. Frame-to-frame management of points is required so it's not simple to run it entirely in vertex shader.

My thing can, for example, do curls like this with only a couple of segments, and can be controlled either by forward or inverse kinematics, via parameters that don't require direct manipulation of individual segments nor preserving their state between frames (for forward kinematics)

Doing that with FABRIK is pretty much impossible.

xyz

Finally put some proper FPS hands into the game. More details and screenshots in a new devlog on itch:
https://nenad2d.itch.io/shut/devlog/1111056/first-person-hand

kuligs2

xyz sounds need ballancing, one sound is normal then next is too loud, almost peed a little from the surprise earrape.

Now, what are them cube thingies on fingers? bones or the type meta rig controllers? Did you do them in blender or other software? Asking since this is closely related to what im doing atm 🙂

xyz

kuligs2 Which sound was too loud?

It's Blender. Those cube thingies are bones. You can customize how they are drawn in pose mode. Go to bone properties -> viewport display -> custom shape, and assign the object. I used empty cubes and a sphere for this rig, positioned in a way that the bone origin is in the center. Makes posing easy and intuitive when combined with ik.

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