Blender Git Loki

SSAO shader.

This works by using the calculated view space normal and accumulating
coverage of a certain area by nearby pixels. There are two sliders to
control the effect:

* Scale controls the area around each pixel that the shader "collides"
against
* Darkening scales the occlusion effect.

The effect works, but due to the way the normals are calculated, the
normals are never smooth shaded (that would require a separate render
target to store them) and the edges or polygons can be too apparent.
This is not really fixable at the moment unless we move to deferred
pipeline.

The FX system is stll not well optimized and rendering does not always
work correctly, but it's good to have this out for people to play with.

Removed unused code.

Added a calculation function for the fictitious forces introduced by
moving hair root reference frames.

This calculates Euler, Coriolis and Centrifugal forces which result
from describing hair in a moving reference frame.
http://en.wikipedia.org/wiki/Fictitious_force

Fix for own misconception of fictitious forces in the moving hair root
frames.

These forces don't have to be calculated for each individual
contribution. Rather they can be split off and be calculated on top of
the basic force vector rotation (todo).

Added back spring force definitions outside the implicit solver.

There are currently 3 types of springs: basic linear springs, goal
springs toward a fixed global target (not recommended, but works) and
bending springs.

These are agnostic to the specific spring definition in the cloth system
so hair systems can use the same API without converting everything to
cloth first.

Main cloth force calculation function outside of implicit core code.

Still misses spring forces.

Hair volume calculation is now in its own file.

Code is currently disabled until the other main forces are in place.

Moved the unused goal force calculation function to the main mass-spring
source file.

Moved most of the main cloth solver function out of implicit code core.

Force calculation is disabled, will follow shortly.

Merge branch 'master' into temp_custom_loop_normals

Moved init/free functions for solver data out of implicit core.

This also initializes spring matrix indices (off-diagonal 3x3 blocks),
which now uses a new API function.

Moved "set_positions" for cloth out of core implicit solver.

API for the solver now has functions for setting of vertex motion state
and the associated root transform data.

Revert "Squashed commit of the following:"

This reverts commit 48eac582c846bd75f6083740509ed75cfa8a3f19.

Squashed commit of the following:

commit 5f4d6c97c8f0d8b5e35ec23167d6f35a628c052c
Author: Jonathan deWerd <jjoonathan@gmail.com>
Date: Sat Sep 13 19:28:42 2014 -0400

Merge of soc-2014-NURBS: rhino import, analytic normals, trim support, uv trim editor, ux improvements.

Merge remote-tracking branch 'origin/master' into testbuild

Revert "Merge of SoC-NURBS: rhino import, analytic eval, trim support, uv trim editor, ux fixes."

This reverts commit 85a59690c092d7242fabd2164960a98f0661d3f8.

Merge of SoC-NURBS: rhino import, analytic eval, trim support, uv trim editor, ux fixes.

Merge branch 'master' into testbuild

Renamed functions to make them explicitly refer to cloth, and split the
create/free functions for solver data off from the cloth solver.

Moved the cloth solver code into a new subfolder/library inside Blender
code.

The implicit solver itself should remain agnostic to the specifics of
the Blender data (cloth vs. hair). This way we could avoid the bloated
data conversion chain from particles/hair to derived mesh to cloth
modifier to implicit solver data and back. Every step in this chain adds
overhead as well as rounding errors and a possibility for bugs, not to
speak of making the code horribly complicated.

The new subfolder is named "physics" since it should be the start of a
somewhat "unified" physics systems combining all the various solvers in
the same place and managing things like synchronized time steps.