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= Summer of Code Proposal =
== Name ==

Ben Batt

== Email ==

benbatt at gmail.com

== Project Title ==

Modifier Stack Upgrade

== Synopsis ==

The goal of this project is to improve Blender's modifier stack in two ways:
* Making the API more flexible and removing restrictions such as the current inability to place certain modifiers after non-deforming modifiers
* Adding some new modifiers: Autosmooth, UV Projection and Displacement.

== Benefits to the Blender Community ==

This project will benefit the Blender community by providing a more useful
and flexible modifier interface to users and programmers. Some constraints
will be removed, giving more power to users. The new modifier types added
will provide more functionality, increasing Blender's usefulness.

== Deliverables ==

* Upgrade of modifier stack
* Upgrade of current modifiers to work with the new modifier stack
* Autosmooth modifier
* UV Projection modifier
* Displacement modifier

== Project Details ==

=== Modifier Stack Upgrade ===

Blender's current modifier stack is a very useful tool. However, it suffers
from some constraints. The main constraint this project aims to remove is
the "original data" constraint: some modifiers require the base object's
original data and thus cannot be placed in the stack after any non-deforming
modifiers. Another constraint is that many modifiers cannot be applied to
curves (for some modifiers this may not make sense, but for others it would
be useful).

The best approach to upgrading the modifier stack is still to be determined,
but there are a few possibilities.

One approach would be to extend the DerivedMesh implementation (currently
used to transfer data between modifiers) to maintain all the original data
from the base mesh. This could be less work, but may not be the best
solution, as DerivedMesh is used in many places - a more targeted solution
could be better.

Another approach would be to create a new ModifierMesh data structure to
hold intermediate data between modifiers. This structure could hold all the
original data from the base mesh, and modifiers could perform shallow copies
of any data which they did not change. The structure would need to keep
track of which data was shallow copied and possibly provide for a mapping
between the current ModifierMesh data and the original object data.

=== Current Modifier Upgrade ===

Along with upgrading the modifier stack, the currently implemented modifiers
will also have to be upgraded to work with the new API. This will not be
too large a job, as most of the internals can stay the same. If others are
working on modifiers at the same time as this project is underway, I will
be happy to assist them in using the new API.

=== New Modifiers ===

The new modifiers to be added as part of this project are Autosmooth, UV
Projection, and Displacement.

The Autosmooth modifier will perform the same function as Blender's current
Mesh Auto Smooth option (splitting appropriate vertices and recalculating
normals to make edges sharper than a threshold angle appear sharp while the
rest appear smooth), but the results will be visible in Blender's 3D view
window without needing to perform a render. Additionally, the results will
be available to Python scripts for exporting purposes, making this modifier
very useful for 3D content creation. Other features to be added include
the ability to mark edges as sharp, and the ability to select different
vertex normal calculation methods. Once completed, this modifier could
replace the Mesh Auto Smooth button altogether, removing unnecessary
complexity from the render code.

The UV Projection modifier will change a mesh's UV coordinates by projecting
them onto the mesh using the matrix of a helper object (as though the UV
texture was projected onto the mesh by a slide projector located at the
helper object's position). Among other things, this modifier would be very
useful for texturing meshes with photographs, as the projection could
provide perspective correction.

The Displacement modifier will use a texture to displace vertices of a mesh.
The displacement could be simple (using the luminosity of the image to
displace in a single axis or direction), or more complex (for example, using
the R, G and B values of the image to displace vertices in the X, Y and Z
directions respectively. This is similar to the "Displacement" texture
mapping type, with the exception that the displaced geometry is visible
in the 3D view and can be accessed by Python scripts, exported or further
modified.

== Project Schedule ==

The first stage of the project will be to upgrade the modifier stack API.
This will involve a brief period of investigation to determine the best
approach, followed by a design and implementation stage.

The second stage of the project will be to upgrade the old modifiers to use
the new modifier stack. This will also be a good opportunity to test the new
modifier stack API for completeness.

The third stage of the project will be to implement the new modifiers. This
will also provide further feedback on the new API.

I anticipate the first and second stages taking around half of the project
time, with the third stage taking the other half.

== Bio ==

I am a final year Computer Science/Computer Systems Engineering double degree
student at RMIT University in Melbourne, Australia. I have undertaken a
number of computer graphics subjects as part of my studies, creating a simple
3D engine and using Blender to create content for it.

I have been interested in open source software for some time. I run Linux
on my home PC and do most of my software development in that environment.
I also dual-boot Windows so I can test cross-platform compatibility (this
was useful in finding a bug when working on the Array modifier).

I have worked on two Blender programming projects: a Python-based exporter
for the HPX format written in Python, and an Array modifier written in C
(see http://mediawiki.blender.org/index.php/BlenderDev/ArrayModifier).
I have begun work on an Autosmooth modifier, but this is currently on hold
due to study commitments.

I am comfortable programming in C, C++ and Java (having used them throughout
my university studies), and am familiar with Python. I have used Blender for
simple modelling tasks and program testing, and have a basic grasp of the
interface. Having programmed additions to Blender in both Python and C, I
am reasonably familiar with Blender's internals, particularly the modifier
code.

I am excited about getting more involved with Blender development. I find
it very satisfying work, and look forward to being able to contribute more.

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