Blender Git Loki

Fix artifacts caused by double plastic computation whith collisions

Fix plasticity issue with shearing springs

Implement rest planarity factor option

Refactor/Optimization: Integrate bend springs into struct/shear

A bending spring runs along each structural and shearing spring. Taking
advantage of that, this integrates the required data for both into the
same spring struct instance. This greatly simplifies bending spring
generation code, and also reduces the memory usage for spring storage
in about 40-50%.

This change also fixes minor memory management issues.

Cleanup: Fix some returns and potential memory leaks

Cleanup: fix some types, and remove unused var

Fix mistake in angular spring generation

Implement angular spring support for dynamic mesh

Implement proper sub-step independent plasticity scaling

Implement angular plasticity (has issues)

Same issues as the previous structural plasticity commit.

Implement structural plasticity (has issues)

The issue here is that the rest length factor isn't cached, because the
cache only allows you to store a single type of data per cache (I'll try
to fix this later), so if you interrupt the simulation midway through,
going to the start frame, the plastic deformations will be reset.

Fixed some typos, and missing initializations

Implement angular bending damping

Add some comments about methods used for mass-spring model

Set better default values for the new mass-spring model

Implement shear springs for ngons

Implement bending springs along shear springs within polygons

This adds bending springs within polygons, so that they resist
changing planarity.

Initial implementation of angular bending springs

This implements bending resistant forces between adjacent polygons in
cloth simulation. Note that derivatives are not yet included in the
computations (and might not even be needed, as the simulation is already
quite stable). Angular damping is not yet implemented either.

Add cent_poly_v3 function

Rename angular hair spring things to hair instead of angular

This is to make a clear distinction between the existing angular hair
springs, and the new generic angular springs.