Blender Git Loki

Cycles-Bake: divide the in/direct passes by the color passes

Otherwise the in/direct passes are 'contamined' by the texture/color of
the faces.

Cycles-Bake: 1st round of code-review

For the individual commits:
https://github.com/dfelinto/blender-git/tree/bake-cycles-0.1

Documentation:
http://wiki.blender.org/index.php/User:Dfelinto/CyclesBaking

Open Issues:
https://github.com/dfelinto/blender-git/issues?labels=bake-cycles&page=1&state=open

Supported Features:
------------------
* Margin
* User Interface (no more need to fiddle with Python scripts)
* Selected to Active
* Cage Extrusion
* Custom Cage
* File Formats (save as PNG, JPG, OpenEXR, Tiff, Targa and BMP)
* Color Depth/Mode: RGB/RGBA - 8/16/32
* Normal swizzle (change the axis that gets mapped to RGB)
* Normal space (save as tangent, world, object)

Supported Passes:
-----------------
Data Passes
* Normal
* UV
* Diffuse/Glossy/Transmission/Subsurface/Emit Color

Light Passes
* AO
* Combined
* Shadow
* Diffuse/Glossy/Transmission/Subsurface/Emit Direct/Indirect
* Environment

Implementation Notes:
---------------------
Baking for Cycles was implemented in two fronts:

In Blender we created a new operator that will try to bake using the current engine.
So far only Cycles has this implemented, but other engines (even the Blender Internal) could go through this API/pipeline.
The operator is responsible for the image handling, normal space
transformation, populate the UVs, loop over faces, ...

In Cycles we extended the baking functionality available for environment
and displacement for the other render passes (not all of them since some
of them doesn't make sense for baking).

The API is simple. Blender send a populated array of BakePixels to the
renderer, and gets back an array of floats with the result.

BakePixel is tjhe following struct:

struct BakePixel {
int primitive_id;
float u, v;
float dudx, dudy;
float dvdx, dvdy;
};

intern/cycles/blender/addon/__init__.py
intern/cycles/blender/addon/engine.py
intern/cycles/blender/addon/properties.py
intern/cycles/blender/addon/ui.py
intern/cycles/blender/blender_python.cpp
intern/cycles/blender/blender_session.cpp
intern/cycles/blender/blender_session.h
intern/cycles/kernel/kernel_accumulate.h
intern/cycles/kernel/kernel_displace.h
intern/cycles/kernel/kernel_path.h
intern/cycles/kernel/kernel_types.h
intern/cycles/render/CMakeLists.txt
intern/cycles/render/bake.cpp
intern/cycles/render/bake.h
intern/cycles/render/film.cpp
intern/cycles/render/integrator.cpp
intern/cycles/render/integrator.h
intern/cycles/render/scene.cpp
intern/cycles/render/scene.h
intern/cycles/render/session.cpp
intern/cycles/render/session.h
source/blender/blenkernel/BKE_mesh.h
source/blender/blenkernel/intern/mesh.c
source/blender/editors/object/CMakeLists.txt
source/blender/editors/object/object_bake.c
source/blender/editors/object/object_bake_new.c
source/blender/editors/object/object_intern.h
source/blender/editors/object/object_ops.c
source/blender/makesdna/DNA_scene_types.h
source/blender/makesrna/RNA_enum_types.h
source/blender/makesrna/intern/rna_main_api.c
source/blender/makesrna/intern/rna_render.c
source/blender/makesrna/intern/rna_scene.c
source/blender/render/CMakeLists.txt
source/blender/render/extern/include/RE_bake.h
source/blender/render/extern/include/RE_engine.h
source/blender/render/intern/source/bake.c
source/blender/render/intern/source/bake_new.c
source/blender/render/intern/source/external_engine.c
source/blender/windowmanager/WM_api.h

Cycles-Bake: Selected to Active - using global coordinates

The user no longer needs to apply the transformation before baking

Cycles-Bake: remove unused code

Cycles-Bake: Fix for "missing" rays generating spurious result in tangent maps

missing rays are rays cast from the low poly mesh (or the cage) that dont hit the high poly object

Cycles-Bake: support non-alpha saving of png, openexr, ...

Cycles-Bake: Support for float formats (openexr, png, ...)

Next: Support for saving with no alpha

Cycles-Bake: Saving different file formats *

Todo:
* I still can't have PNG to save without alpha
* I think it's always saving as 8 bit

Apart from that UI is working.

Cycles-Bake: Fix for padding (margin) not working in tangent maps

Note: you cannot save png without alpha for now, Im working on that in a separate branch

Cycles-Bake: accept relative path in filepath

Cycles-Bake: another compile fix attempt

Cycles-Bake: Fix warnings and compile errors (hopefully)

Cycles-Bake: ui fix - cage works for non-normal passes too

Cycles-Bake: User Interface

Cycles-Bake: remove invoke

Cycles-Bake: Custom Cage support

New Python argument: "custom_cage", that should be a name of the object to use as custom cage

Cycles-Bake: silenting warning: set default string value as NULL - no more crashes

Cycles-Bake: Fix Linux build error

Cycles-Bake: Tangent Normal space mode

TANGENT gives no crash and bluish results, so it seems correct.
There are some differences from BI and Cycles, I'll have to test further
to see which one is correct.

Apart from that there is a chance the swizzle is wrong.
In other words, the directions may be swapped, or inverted.
It will be an easy fix though. I just need to put time on testing this
against other applications and simple test files.

* Refactored calculateTriTessFaces to store tangent.
* Re-set neutral color for WORLD/OBJECT maps to be 0,0,0 from Cycles

Cycles-Bake: normal swizzle, and OBJECT and WORLD normal spaces

The user can now decide between the normal_space (OBJECT, WORLD)
The user can now decide on the swizzle (+X,+Y,+Z):
* normal_r, normal_g, normal_b

+ barebones code for TANGENT normal space
Though this is not working, thus it's disabled in operator enum.