Documentation & Test blend files:
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http://wiki.blender.org/index.php/User:MiikaH/GSoC-2012-Smoke-Simulator-Improvements
Credits:
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Miika Hamalainen (MiikaH): Student / Main programmer
Daniel Genrich (Genscher): Mentor / Programmer of merged patches from Smoke2 branch
Google: For Google Summer of Code 2012
- don't overwrite the font path with "<builtin>" when the font file cant be found, it caused bad problems when loading files on someone elses systems when paths couldn't be found blender would silently clobber paths (tsk tsk).
- when fonts are freed their temp data is now freed too.
- assigning a new filepath to a font now refreshes the object data.
When initially coding this functionality, I was aware of the potential for
infinite recursion here, just not how frequently such setups are actually
used/created out in the wild (nodetree.ma_node -> ma -> ma.nodetree is all too
common, and often even with several levels of indirection!).
However, the best fix for these problems was not immediately clear. Alternatives
considered included...
1) checking for common recursive cases. This was the solution employed for one
of the early patches committed to try and get around this. However, it's all too
easy to defeat these measures (with all the possible combinations of indirection
node groups bring).
2) arbitrarily restricting recursion to only go down 2/3 levels? Has the risk
of missing some deeply chained/nested drivers, but at least we're guaranteed to
not get too bad. (Plus, who creates such setups anyway ;)
*3) using the generic LIB_DOIT flag (check for tagged items and not recurse down
there). Not as future-proof if some new code suddenly decides to start adding
these tags to materials along the way, but is easiest to add, and should be
flexible enough to catch most cases, since we only care that at some point those
drivers will be evaluated if they're attached to stuff we're interested in.
4) introducing a separate flag for Materials indicating they've been checked
already. Similar to 3) and solves the future-proofing, but this leads to...
5) why bother with remembering to clear flags before traversing for drivers to
evaluate, when they should be tagged for evaluation like everything else?
Downside - requires depsgraph refactor so that we can actually track the fact
that there are dependencies to/from the material datablock, and not just to the
object using said material. (i.e. Currently infeasible)
It used to be a dependency cycle which lead to incorrect or
missed tesselation on some circumstances.
Seems to be introduced in rev41627.
This commit seems to behaving properly on simple cases,
probably could fail in some other cases, so need to be
checked further.
Discovered when was looking into:
#32034: Metaball used as render object(group) for particle will display wire only.
There was some bad recursion introduced recently that caused crashes
when a Material node is the same material as the material itself (e.g.,
if Material.001 has a node with Material.001).
This commit attempt to correct this by keeping track of the material
at the root of the node tree, and doesn't recurse further if it
encounters it again within the nodetree.
Joshua, please review!
Until now, there was never any code for making drivers on materials get
recalculated when their dependencies were changed. However, since changing
material colors with drivers is something that is quite common, a workaround was
introduced to ensure that materials could still be driven (albeit with the
relevant drivers rooted at object level). This worked well enough so far with
traditional materials - though it was sometimes clunky and confusing for some
users - and would have been ok to tide us over until the depsgraph refactor.
The introduction of Cycles changed this, as it has in many other ways. Now that
people use Cycles to render, they'll need to drive the material colors through
the nested nodetree (and other things nested deeply within that). However, this
is much more difficult to generate hacks to create the relevant paths needed to
work around the problem.
== This Commit... ==
* Adds a recursive driver calculation step to the BKE_object_handle_update()
(which gets called whenever the depsgraph has finished tagging object datablocks
for updates), which goes through calculating the drivers attached to the object
(and the materials/nodetrees attached to that). This case gets handled everytime
the object is tagged as needing updates to its "data" (OB_RECALC_DATA)
* When building the depsgraph, every dependency that the drivers there have are
treated as if they were attached to object.data instead. This should trick the
depsgraph into tagging OB_RECALC_DATA to force recalculation of drivers, at the
expense perhaps of modifiers getting recalculated again.
== Todo ==
* The old workarounds noted are still in place (will be commented out in the
next commit). This fix renders at least the material case redundant, although
the textures case still needs a bit more work.
* Check on whether similar hacks can be done for other datablock combinations
* So far, only simple test cases have been tested. There is probably some
performance penalty for heavy setups still (due to need to traverse down all
parts of material/node hierarchy to find things that need updates). If there
really is a problem here, we could try introducing some tags to limit this
traversal (which get added at depsgraph build time). <--- USER TESTING
NEEDED!!!
Added four new functions as shortcuts to creating GHashes that use the
standard ptr/str/int/pair hash and compare functions.
GHash *BLI_ghash_ptr_new(const char *info);
GHash *BLI_ghash_str_new(const char *info);
GHash *BLI_ghash_int_new(const char *info);
GHash *BLI_ghash_pair_new(const char *info);
Replaced almost all occurrences of BLI_ghash_new() with one of the
above functions.
All operators which changes tracking data now just tags dopsheet as outdated,
actual re-calculaiton of happens only when this information is actually needed
(like on dopesheet draw).
This makes things a bit faster when there's no dopesheet visible in current
screen and also makes it much easier to update dopesheet using dependency
graph.
Also renamed dopesheet_sort_order to dopesheet_sort_method in rna and internal
stuff which makes much more sense and also correlated with naming in
file browser.
- Make sure functions are named in way BKE_<object>_<action> (same way as RNA callbacks)
- Make functions which are used by mball.c only static and remove their prototypes
from public header file.
Further cleanup is coming.
--debug
--debug-ffmpeg
--debug-python
--debug-events
--debug-wm
This makes debug output easier to read - event debug prints would flood output too much before.
For convenience:
--debug-all turns all debug flags on (works as --debug did before).
also removed some redundant whitespace in debug prints and prefix some prints with __func__ to give some context.
problem was that BMesh had tessellation call when undo pushes were called.
if python called an operator with no undo push, tessfaces would not be created.
fix this by making it the responsibility of each editmesh operator to re-tessellate, as it is with notifiers and depsgraph.
added EDBM_update_generic() function to add notifier, tag for depsgraph update and optionally re-tessellate.
