Blender Git Statistics -> Developers -> sybren

Sybren A. Stüvel (sybren)

Total Commits : 1 102
Master Commits : 571
Branch Commits : 531
First Commit : January 14, 2015
Latest Commit : December 14, 2019 (Yesterday)

Commits by Month

DateNumber of Commits
December, 2019101
November, 2019164
October, 201916
September, 201919
August, 201916
July, 201968
June, 201955
May, 20192
April, 20195
March, 20194
February, 20190
January, 20198
December, 20186
November, 20186
October, 20181
September, 20181
August, 20180
July, 201825
June, 201860
May, 201881
April, 201864
March, 20187
February, 20182
January, 201811
December, 20170
November, 20172
October, 20179
September, 20171
August, 201717
July, 201713
June, 201710
May, 201716
April, 2017128
March, 201715
February, 201746
January, 20170
December, 20169
November, 201617
October, 201614
September, 201614
August, 20163
July, 20160
June, 20160
May, 20160
April, 20161
March, 20161
February, 20160
January, 20162
December, 20150
November, 20153
October, 20151
September, 20157
August, 20153
July, 201510
June, 20154
May, 20151
April, 20154
March, 20154
February, 201516
January, 20159

Commit Distribution

PathNumber of Commits
master571
temp-outliner-visibility186
hair_object186
collada2.8183
temp-ui-layout-2.8180
blender2.8_snap_gizmo180
interactive_physics179
soc-2018-cycles-volumes178
tmp_hair_curves178
benchmark178
soc-2018-bevel178
temp-benchmark178
hair_guides_grooming178
temp-select-axis178
temp-udim-images178
hair_guides178
temp-sybren-cow-ocean176
temp-eeveelightcache172
temp-greasepencil-vfx170
temp-tab_drag_drop159
temp-dynamic-overrides150
temp-greasepencil-object-stacksplit148
TEMP-UI-DECOR143
temp-flexible-spacing137
ui_layout_gridflow137
temp-modifier-rm-cddm130
temp-keymap-changes122
tmp-CollectionsAnim105
tmp-b28-motionpath-drawing103
temp-keymap-save98
sybren-usd95
tmp-COW_InsertKeyframe_Fix95
temp-sybren-particles91
temp-unified-collections89
temp-sybren-usd-patch-0280
temp-sybren-modifier-nonmesh80
experimental_gp_weight79
topbar78
tmp-TimelineHeaderButtonsStretching78
temp-sybren-meshdeform66
blender2.8-snapping_with_occlusion65
temp-sybren-usd-patch-0365
tmp-static-override-insertion65
blender2.8-workbench63
temp-sybren-alembic56
temp-sybren-usd-patch56
id_override_static45
temp-object-multi-mode43
temp-render-depsgraph37
temp-workspace-addons37
temp-workspace-object-mode-removal37
temp-drawcontext37
temp-scene-obedit-remove37
temp-sybren-poselib34
temp-workspace_mode34
temp-workspace_active_object34
temp-group-collections34
temp-workspace-changes30
strand_editmode30
custom-manipulators30
temp-ssr27
tmp-debug-filebrowser27
temp-lightprobe-rename23
workspaces23
temp-cycles-draw-manager22
temp-sybren-usd-patch-0120
asset-engine13
sybren-usd-experiments13
fracture_modifier-master12
fracture_modifier12
temp-fracture-modifier-2.812
blender-v2.79b-release10
blender-v2.79a-release8
blender-v2.79-release7
transform-manipulators5
temp-depsgraph-layers5
imm_port_wm_playanim5
id_copy_refactor5
temp-workspace-multi-window5
temp-sybren-bpy-make-local4
multi_previews_id4
temp-sybren-usd3
temp-sybren-abc-groupexport3
blender-v2.75-release2
temp-lanpr-cleanup22
temp-lanpr-cleanup2
temp-blender-2.81-release-with-wrong-merge2
temp-sybren-usd-apple2
temp-sybren-vse-wave-text-toggle1
blender-v2.74-release1
blender-v2.81-release1
temp-sybren-abc-tests-windows1
temp-blender2.8-stable1
render-layers1
temp-mathutils-doc1
temp-mathutils1
blender-v2.77-release1

Favourite Files

FilenameTotal Edits
abstract_hierarchy_iterator.h89
abstract_hierarchy_iterator.cc77
alembic_capi.cc72
usd_writer_mesh.cc52
abc_mesh.cc49
usd_hierarchy_iterator.cc46
usd_capi.cc45
usd_writer_abstract.cc44
abc_exporter.cc44
usd_writer_abstract.h34

File Changes

ActionTotalPer Commit
Added2500.2
Modified2 6782.4
Deleted160.0

Code Changes

ActionTotalPer Commit
Lines Added33 23832.9
Lines Removed14 66814.5

Latest commits Feed

Revision f8cdc5a by Sybren A. Stüvel (master)
18 hours 20 min ago
USD: on Apple disable USD if library cannot be found

When building with `WITH_USD=ON` on Apple but the USD library cannot be
found, the CMake script now just sets `WITH_USD=OFF`.
Revision 464c9db by Sybren A. Stüvel (temp-sybren-usd-apple)
18 hours 29 min ago
USD: cmake capital NOT required
Revision 58cf6a3 by Sybren A. Stüvel (temp-sybren-usd-apple)
18 hours 32 min ago
USD: build without USD if library cannot be found
Revision e6c40bc by Sybren A. Stüvel (master)
1 day and 12 hours ago
USD: Simplified unit test and made it work on Windows as well
Revision c4203ef by Sybren A. Stüvel (master)
1 day and 12 hours ago
USD: disabled unit test that fails on the buildbot

I can't fix this quickly right now, so I'd rather drop the entire test
for now.
Revision f5e00f7 by Sybren A. Stüvel (master)
1 day and 16 hours ago
USD: more efficient mesh & curve writing

- The default value of USD attributes is now only set on the first sample.
Previously this was done for every sample (so the final default was the
last value, rather than the first value).
- More use of the sparse value writer, now also for UV coordinates, mesh
normals, and curve points.
Revision 322555f by Sybren A. Stüvel (master)
1 day and 16 hours ago
USD: Remove file created in unit test after the test is done

No functional changes in the USD exporter, just some cleanup code added
to the unit test.
Revision ec62413 by Sybren A. Stüvel (master)
1 day and 20 hours ago
USD: Introducing a simple USD Exporter

This commit introduces the first version of an exporter to Pixar's
Universal Scene Description (USD) format.

Reviewed By: sergey, LazyDodo

Differential Revision: https://developer.blender.org/D6287

- The USD libraries are built by `make deps`, but not yet built by
install_deps.sh.
- Only experimental support for instancing; by default all duplicated
objects are made real in the USD file. This is fine for exporting a
linked-in posed character, not so much for thousands of pebbles etc.
- The way materials and UV coordinates and Normals are exported is going
to change soon.
- This patch contains LazyDodo's fixes for building on Windows in D5359.

== Meshes ==

USD seems to support neither per-material nor per-face-group
double-sidedness, so we just use the flag from the first non-empty
material slot. If there is no material we default to double-sidedness.

Each UV map is stored on the mesh in a separate primvar. Materials can
refer to these UV maps, but this is not yet exported by Blender. The
primvar name is the same as the UV Map name. This is to allow the
standard name "st" for texture coordinates by naming the UV Map as such,
without having to guess which UV Map is the "standard" one.

Face-varying mesh normals are written to USD. When the mesh has custom
loop normals those are written. Otherwise the poly flag `ME_SMOOTH` is
inspected to determine the normals.

The UV maps and mesh normals take up a significant amount of space, so
exporting them is optional. They're still enabled by default, though.
For comparison: a shot of Spring (03_035_A) is 1.2 GiB when exported
with UVs and normals, and 262 MiB without. We probably have room for
optimisation of written UVs and normals.

The mesh subdivision scheme isn't using the default value 'Catmull
Clark', but uses 'None', indicating we're exporting a polygonal mesh.
This is necessary for USD to understand our normals; otherwise the mesh
is always rendered smooth. In the future we may want to expose this
choice of subdivision scheme to the user, or auto-detect it when we
actually support exporting pre-subdivision meshes.

A possible optimisation could be to inspect whether all polygons are
smooth or flat, and mark the USD mesh as such. This can be added when
needed.

== Animation ==

Mesh and transform animation are now written when passing
`animation=True` to the export operator. There is no inspection of
whether an object is actually animated or not; USD can handle
deduplication of static values for us.

The administration of which timecode to use for the export is left to
the file-format-specific concrete subclasses of
`AbstractHierarchyIterator`; the abstract iterator itself doesn't know
anything about the passage of time. This will allow subclasses for the
frame-based USD format and time-based Alembic format.

== Support for simple preview materials ==

Very simple versions of the materials are now exported, using only the
viewport diffuse RGB, metallic, and roughness.

When there are multiple materials, the mesh faces are stored as geometry
subset and each material is assigned to the appropriate subset. If there
is only one material this is skipped.

The first material if any) is always applied to the mesh itself
(regardless of the existence of geometry subsets), because the Hydra
viewport doesn't support materials on subsets. See
https://github.com/PixarAnimationStudios/USD/issues/542 for more info.

Note that the geometry subsets are not yet time-sampled, so it may break
when an animated mesh changes topology.

Materials are exported as a flat list under a top-level '/_materials'
namespace. This inhibits instancing of the objects using those
materials, so this is subject to change.

== Hair ==

Only the parent strands are exported, and only with a constant colour.
No UV coordinates, no information about the normals.

== Camera ==

Only perspective cameras are supported for now.

== Particles ==

Particles are only written when they are alive, which means that they
are always visible (there is currently no code that deals with marking
them as invisible outside their lifespan).

Particle-system-instanced objects are exported by suffixing the object
name with the particle's persistent ID, giving each particle XForm a
unique name.

== Instancing/referencing ==

This exporter has experimental support for instancing/referencing.

Dupli-object meshes are now written to USD as references to the original
mesh. This is still very limited in correctness, as there are issues
referencing to materials from a referenced mesh.

I am still committing this, as it gives us a place to start when
continuing the quest for proper instancing in USD.

== Lights ==

USD does not directly support spot lights, so those aren't exported yet.
It's possible to add this in the future via the UsdLuxShapingAPI. The
units used for the light intensity are also still a bit of a mystery.

== Fluid vertex velocities ==

Currently only fluid simulations (not meshes in general) have explicit
vertex velocities. This is the most important case for exporting
velocities, though, as the baked mesh changes topology all the time, and
thus computing the velocities at import time in a post-processing step
is hard.

== The Building Process ==

- USD is built as monolithic library, instead of 25 smaller libraries.
We were linking all of them as 'whole archive' anyway, so this doesn't
affect the final file size. It does, however, make life easier with
respect to linking order, and handling upstream changes.
- The JSON files required by USD are installed into datafiles/usd; they
are required on every platform. Set the `PXR_PATH_DEBUG` to any value
to have the USD library print the paths it uses to find those files.
- USD is patched so that it finds the aforementioned JSON files in a path
that we pass to it from Blender.
- USD is patched to have a `PXR_BUILD_USD_TOOLS` CMake option to disable
building the tools in its `bin` directory. This is sent as a pull
request at https://github.com/PixarAnimationStudios/USD/pull/1048
Revision cc3c452 by Sybren A. Stüvel (temp-sybren-usd-patch-03)
December 13, 2019, 04:30 (GMT)
USD: enable USD in Release configuration
Revision 143f77e by Sybren A. Stüvel (temp-sybren-usd-patch-03)
December 13, 2019, 04:30 (GMT)
USD: fixed copyright year in license blocks

MiikaHweb - Blender Git Statistics v1.06
By: Miika HämäläinenLast update: Nov-07-2014 14:18 MiikaHweb | 2003-2019