Alright, this is a very interesting geometry node setups to get some automatic realtime indentation and bulge of a mesh with as many colliders as you want, without any sculpting. This has been included with my chastity set for a bit, but now it's a bit more refined.

It's not perfect, and quite wobbly when in motion, but it's very fast.

For the best experience it's necessary to paint the side of the collider that comes into contact with the body. To do that select the desired faces on the collider in edit mode first, then switch to Vertex Paint mode and turn the Paint Mask right beside Vertex Paint, add a black colored attribute called 'Include Indentation', after that you can paint the body with a big radius brush white (only the selected faces will be painted.

The setup relies a lot on smoothing, play with the main smoothing setting at the top and the secondary smoothing at the bottom of the modifier panel.

You can also add a white colored attribute named 'Adjust Indentation' to the squished body. There you can paint the areas black that you don't want to be squished. This is recommended, if some unintended areas get mangled.

Basically white (1) means the effect happens and black (0) that it doesn't. Values in-between are also possible for the squished body, not for the colliders.

In the Vertex Paint Attributes sections in the modifier panel, there is also an option to include the full collider geometry. By default, vertex painting is necessary for any effect. The checkbox 'Include Full Collider' bypasses this but results will be worse. This option is required for my geometry node ropes setup or any kind of mesh where you can't vertex paint.

Contains a neat localized subdivision system, too, to save on the amount of vertices (may cause some ugly triangles).

There is an option to virtually inflate collider geometry, which only seems to work when selecting a single collider object for some reason, though.

The collision area data can be passed to the shader material by using an Attribute node with the name 'Shader Info'.

Just play with the settings for the desired result.

(Available in the pinned post for Advanced tier members.)

(Download for Advanced tier in pinned post.)

This was a long time coming, I made the switch from Goo Engine to the Blender NPR Prototype, which provides many new features and quality improvements. The NPR Prototype is based on Blender 4.4.1 . However, it seems to get discontinued now so use it at your own risk.

The core shader is now based on the Principled BSDF with some additions and you can use the NPR node tree with any BSDF, if you like. Shadow colors are taken from the underlying surface, painterly normals system included, hair see-through effect works, shader on line art is supported, new compositor setup can modify the line art ,and more stuff.

Self-shadows can't get filtered out so face shading may look worse than before.

For the hair see-through effect, add a shader AOV with the name 'Refraction' to the eyes, eyelids and eyebrows. Enable Raytraced Refraction on the hair.

The system is not extensively tested at this point, the Mavuika and Furina bike scene is made with this.

Demo file and complicated character preparation guide is included. Asset updates are posted on Discord and you can discuss things there.

- Adjustable Pointiness.

- Auto-extending mesh without stretching.

- UV unwrapped.

- Seamless procedural noise texture included (other materials work nicely, too).

- Custom object attachable at the root, like the included magic circle. (Attach an 
  Attribute node with the name "UVMap" to your custom object material.)

- Make sure to increase spline resolution to the max in the curve properties.

Blue Tentacle Dimension background environment available with my latest rendering setup.