Analyse animation of muscle cells

[tarelli]

The muscle cells get contracted as part of the SPH simulation. The animation will have to show the same but this falls outside the classic skinning based animation.

• [ ] Analyse existing methods, e.g. this
• [ ] Make proposal(s) for how to animate the muscle cells and estimate the different ones

[martinmadaras]

Muscles will be stretched in the the direction of muscle bone only. Direction perpendicular to the bone will be ignored.

First proposed solution for muscle animation:

1. for each muscle cell a bone will be computed - this should be done by computing AABB bounding box of muscle particles
2. bone space fore each muscle will be computed
3. particles in each muscle will be transformed from object space into bone tangent space of the muscle, stretched in the bone space along the bone and transformed back to object space
4. finally, a skinning animation of the cuticle will be applied on the muscle vertices