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For all your hentai-inspired impregnation scenes.
Why abstracted? Because sometimes "realistic" just looks weird and/or nasty. I have a personal motto of "insides should stay inside," because frankly, insides tend to be pretty disgusting, in my opinion. Simpler abstractions that get the idea across are more than sufficient, and are far friendlier on the eyes.
Comes in two models. The womb is comprised of 3 parts: the canvas (the huge red thing), the shell (the smaller orange thing), and the egg (the smallerer brown thing). The canvas and shell are semi-spheres, the egg is a full sphere. They all rely on in-engine lighting for their shading details - their materials are extremely simple, and the textures are solid colors. The shell and egg have bones for deformation, for the sperm penetrating them.
The sperm is a simple 9-bone model. Right-click -> Import Sequence on it to load in the provided swimming animation (so you don't have to animate it yourself), and then simply animate the rootTransform bone.
I have a goal of making a handful of different "stock animations" for people to use, built off this model, with varying amounts of sperm swimming around. That way, people won't have to make their own impregnation animations at all, and can just use the stock animations, if one suits their needs.
No ETA on the stock animations, though.