Naturalis v1.1-alpha3 release

• Gravity Simulation
• Misc Changes & Fixes
• Clothing Adjustments Feature Preview

Gravity Simulation

I'm pretty excited to bring you this new feature!

You can now easily apply gravity in a given direction relative to the breast and glute joint rotations. No matter what pose the model happens to be in, you can check how things would look and behave if the model was rotated in any 90 degree angle relative to gravity, but without actually having to leave the plugin UI to change the pose.

This makes it extremely easy to preview any changes you make to clothing adjustment profiles, breast/glute gravity multipliers, physics parameters and their gravity multipliers, as well as morphing multipliers.

• The buttons to control the direction of gravity are shown in all the relevant windows where you might want to use them (if you think I missed some window, let me know).
• The magnitude of the force is dependent for the direction that you're simulating, just like if you rotated the pose. That magnitude is decided by the multipliers in the Breast Weight or Glute Weight window.
• The simulated gravity is applied to the entire body, with a few exceptions - it's not (yet) applied to clothing and hair sims, and simulating in TittyMagic doesn't affect glutes, and simulating in BootyMagic doesn't affect breasts.
• Smooth transition when changing the direction.
• The simulation runs alongside anything else that happens in the scene, unless you freeze the scene manually.
• The simulation stops automatically when you exit the current UI or calibrate the plugin.

If you're using the right side UI layout in VR (VAM user preferences setting), the buttons don't yet align to the correct side of the UI.

Misc Changes

• Increased breast collider mass further, causing movement with collision is easier now. Fixed its scaling with softness as well - at default 70, there was too little mass while at 100 it was ok.
• Increased sideways target angles, reduced sideways gravity.
• The amount of sideways morphing is overall increased, and is now consistent for all poses (previously the amount was dependent on pose angle).

Fixes

• Fixed an issue where sideways morphing did not adjust the same way when leaning left vs when leaning right, causing the morph values not to be correctly mirrored.
• Fixed issue where the multidirectional calibration (LDP on) applied a slightly incorrect upward shape.
• Fixed the custom gravity force not being applied exactly unidirectionally to both breasts/glutes.

Clothing Adjustments Feature Preview

The forces are now implemented in a way that works in every pose. For each axis of the breast or glute joint, you can adjust how much force is applied, and how strongly the joint's rotation should be held in place regardless of gravity.

It's a system which attempts to fake the way that clothing would realistically produce tension around a soft body due to the cloth shape and rigidity. (I'm not 100% sure if "tension" is technically the correct word, but it'll do.) The explanations further down might sound complicated, but it's quite obvious what is going on when you adjust the sliders and simulate different gravity directions. :)

The current implementation is a properly functioning demo that lets you play around with the forces, but with the following caveats:

• The changes aren't saved yet - whatever you do in this window is specific to the current scene and doesn't save with the scene.
• Only one clothing profile can be active at a time. It's easiest to just equip one item at a time.
• The results might be different for different masses. The force doesn't yet scale properly with breast/glute mass to produce a result that's visually similar.
• Clothing items irrelevant to breasts aren't automatically filtered out, same with glutes, and the plugin doesn't necessarily automatically pick the correct item for you - you have to go and select it and keep it selected to apply to forces.
• The system only works correctly in normal scene gravity at this point. I do want to implement proper support for lower gravity and even weird angular scene gravity values at some point though - because space boobs.

The only thing it's doing so far is adjusting forces - but this feeds into the directional force morphing system and changes physical behavior because it counters or amplifies gravity.

I'll be looking into additional auto-adjustments and controls for physics parameters next, and additional morph options to fine tune the shape!

Additional info for boob physics nerds

Countering gravity and amplifying gravity are the key ideas. The tension of different clothing items can affect breasts (and glutes) in different ways, and the system accommodates for all kinds of possible clothing items from very loose and light to heavy or completely rigid, from those that press down to ones that squeeze together, etc.

Slider explanations with a few examples:

Up Force (Up/Down Force > 0)

• Example with 0% hold: A cupless bra - lifts up but doesn't provide other support
• Example with some hold: A normal bra that covers both below and above - pushes up but also keeps in place

Up force lifts the joint up against gravity.

At 0% hold, when rotating away from an upright angle, the force is reduced since there's less downward gravity to counter. When at a horizontal angle (e.g. lying on the back), there's zero gravity along the joint's vertical axis, so from there onwards, the force is only applied in the amount that exceeds the force of gravity.

At 100% hold however, the clothing keeps the joint vertically in place no matter how much gravity there is along the joint's vertical axis. For example, this allows some very rigid piece of clothing to keep breasts from moving at all due to gravity. In the current implementation, other forces will still cause the joint to move because there's no extra spring or other adjustment that physically prevents forces from rotating the joint. In the future, the Hold slider will probably impact things like spring and in/out spring automatically, although it's worth asking if a very rigid piece of clothing should be simply combined with a low Softness value.

Down Force (Up/Down Force <0)

• Example with 0% hold: A tight t-shirt that presses breasts down a bit, but is flexible and light enough to reduce its hold when upside down
• Example with strong hold: a strap pressing breasts down, tied tightly around the back. Since it's tied in place, it doesn't give in too easily to gravity when upside down.

Down force holds the joint down. This amplifies downward gravity.

At 0% hold, the force is applied at the exact same value regardless of the angle of gravity. So if you rotate the person upside down, it actually starts to counter gravity.

At 100% hold, the force increases the more that gravity decreases. The effect is the same as described above for Up Force.

Up/Down Force = 0

While there's no pushing up or pressing down happening when standing up, the Hold slider can still be used to keep the joint in place.

Sideways Force

• Sideways force > 0 - example with 0% hold: a normal bra that that isn't a rigid cloth
• Sideways force > 0 - example with strong hold: a corset - rigid enough to prevent sideways movement when leaning left/right

A positive sideways force squeezes the joints together. The logic with how much force actually gets applied and how Hold works is the same as with the up/down force, just sideways.

A negative sideways force pulls the joints apart. I can't think of any typical clothing that would pull breasts apart but the support is there.

In Force (In/Out Force > 0)

Pushes the joint against the body. Most clothing items that aren't completely loose would have at least a little bit of this.

Out Force (In/Out Force < 0)

Pulls breasts away from the body. On its own, it sounds like something that no clothing item would do since there's no way for something to push breasts out from "inside the body", or the pull breasts out without being attached to some rigid structure that moves with the chest.

However, if you just think of it as a feature of the shape of the clothing, it makes sense that someting like a bra cup could produce some forward "push" and make breasts less flat compared to au naturel. Or, you might want some clothing that pushes breasts together to actually cause the volume to expand away from the chest rather than against the chest.

As with Up/Down Force, the hold sliders for Sideways and In/Out directions work for holding things in place sideways even if the force is zero.

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Have fun with the gravity controls and the clothing preview! I know I have. 😁

-everlaster