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Current implementation more or less indiscriminately links physics
objects to colliders and forces, ignoring precise details of layer
checks and collider groups. The new depsgraph seemed to lack some
such links at all. The relevant code in modifiers suffers from a
lot of duplication.
Different physics simulations use independent implementations of
collision and similar things, which results in a lot of variance:
* Cloth collides with objects on same or visible layer with dupli.
* Softbody collides with objects on same layer without dupli.
* Non-hair particles collide on same layer with dupli.
* Smoke uses same code as cloth, but needs different modifier.
* Dynamic paint "collides" with brushes on any layer without dupli.
Force fields with absorption also imply dependency on colliders:
* For most systems, colliders are selected from same layer as field.
* For non-hair particles, it uses the same exact set as the particles.
As a special quirk, smoke ignores smoke flow force fields; on the other
hand dependency on such field implies dependency on the smoke domain.
This introduces two utility functions each for old and new depsgraph
that are flexible enough to handle all these variations, and uses them
to handle particles, cloth, smoke, softbody and dynpaint.
One thing to watch out for is that depsgraph code shouldn't rely on
any properties that don't cause a graph rebuild when changed. This
was violated in the original code that was building force field links,
while taking zero field weights into account.
This change may cause new dependency cycles in cases where necessary
dependencies were missing, but may also remove cycles in situations
where unnecessary links were previously created. It's also now possible
to solve some cycles by switching to explicit groups, since they are
now properly taken into account for dependencies.
Differential Revision: https://developer.blender.org/D2141
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Note that the collision modifier doesn't have any use for Loop indices,
so to avoid duplicating the loop array too,
MVertTri has been added which simply stores vertex indices (runtime only).
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some coordinate transform issues.
Collision response should be regarded as part of the dynamics system
instead of the basic collision detection.
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The original BLI method for line/triangle intersection returns false
in case the line does not actually intersect, but in order to generate
repulsion forces we need to also handle contacts inside the margin.
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This is still using the old BVH tree collision methods to generate
contact points, similar to what cloth does. This should be replaced
by a Bullet collision check, but generating contacts in this way is
easier for now, and lets us test responses and stability (although in
more complex collision cases the BVH method fails utterly, beside being
terribly inefficient with many colliders).
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too. [This is preparation work for animated smoke collision]
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added some missing functions too - which are not used yep but should be there for api completeness.
* CDDM_set_mloop
* CDDM_set_mpoly
* BLI_mempool_count
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without the underscores these clogged up the namespace for autocompleation which was annoying.
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http://markmail.org/message/fp7ozcywxum3ar7n
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Recommitted eltopo collision code (but disabled by default)
with Genscher's permission.
To use, you need to install liblapack and libblas
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discussed with Janne, Ton, Nathan and we agreed this kind of change at least needs discussion with module owners.
Its also too close to release to be making these kinds of changes.
commands used:
# reverse merge
svn merge -r36073:36072 .
# for some reason this gave a lot of property changes
svn revert `svn st | grep "^ M" | awk '{print $2}'`
# reverse merging didn't work here, removing while dir.
svn rm extern/eltopo/
# manually fixed conflict in
# ./source/blenderplayer/CMakeLists.txt
#
# also manually removed 2 lines from
# ./CMakeLists.txt
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Plugged the eltopo library into the cloth solver.
I was playing with it earlier, and it's so easy to
use I decided to quickly put it in (trunk's) cloth.
See http://www.cs.ubc.ca/labs/imager/tr/2009/eltopo/eltopo.html
. The authors are on the bleeding edge of continuous collision
detection (one of them did ILM's cloth sim).
I
don't really have to time to plug it into softbody, particles,
bullet, fluid, etc, but doing so would be pretty straightforward.
I'll leave that up to someone else.
To use, turn on USE_ELTOPO (in cmake) or WITH_BF_ELTOPO in scons.
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Warning fixes.
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headers, better include inline with the C files that need them
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to collide with, in addition to the effectors group.
(commit 27746 by Brecht from render25 branch)
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* Unified scene wide gravity (currently in scene buttons)
instead of each simulation having it's own gravity.
* Weight parameters for all effectors and an effector group
setting.
* Every effector can use noise.
* Most effectors have "shapes" point, plane, surface, every point.
- "Point" is most like the old effectors and uses the
effector location as the effector point.
- "Plane" uses the closest point on effectors local xy-plane
as the effector point.
- "Surface" uses the closest point on an effector object's
surface as the effector point.
- "Every Point" uses every point in a mesh effector object
as an effector point.
- The falloff is calculated from this point, so for example
with "surface" shape and "use only negative z axis" it's
possible to apply force only "inside" the effector object.
* Spherical effector is now renamed as "force" as it's no longer
just spherical.
* New effector parameter "flow", which makes the effector act as
surrounding air velocity, so the resulting force is
proportional to the velocity difference of the point and "air
velocity". For example a wind field with flow=1.0 results in
proper non-accelerating wind.
* New effector fields "turbulence", which creates nice random
flow paths, and "drag", which slows the points down.
* Much improved vortex field.
* Effectors can now effect particle rotation as well as location.
* Use full, or only positive/negative z-axis to apply force
(note. the z-axis is the surface normal in the case of
effector shape "surface")
* New "force field" submenu in add menu, which adds an empty
with the chosen effector (curve object for corve guides).
* Other dynamics should be quite easy to add to the effector
system too if wanted.
* "Unified" doesn't mean that force fields give the exact same results for
particles, softbody & cloth, since their final effect depends on many external
factors, like for example the surface area of the effected faces.
Code changes
* Subversion bump for correct handling of global gravity.
* Separate ui py file for common dynamics stuff.
* Particle settings updating is flushed with it's id through
DAG_id_flush_update(..).
Known issues
* Curve guides don't yet have all ui buttons in place, but they
should work none the less.
* Hair dynamics don't yet respect force fields.
Other changes
* Particle emission defaults now to frames 1-200 with life of 50
frames to fill the whole default timeline.
* Many particles drawing related crashes fixed.
* Sometimes particles didn't update on first frame properly.
* Hair with object/group visualization didn't work properly.
* Memory leaks with PointCacheID lists (Genscher, remember to
free pidlists after use :).
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% sign for percentage assuming it is between 0-100, while factor is
for values 0-1.
Move collision setting absorption from modifier to collision settings,
was inconsistent to have it there as the only one, and made it have
range 0.0-1.0 instead of 0-100.
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-r19323:HEAD
Notes:
* blenderbuttons and ICON_SNAP_PEEL_OBJECT were not merged.
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Think global, act local!
The old favorite G.scene gone! Man... that took almost 2 days.
Also removed G.curscreen and G.edbo.
Not everything could get solved; here's some notes.
- modifiers now store current scene in ModifierData. This is not
meant for permanent, but it can probably stick there until we
cleaned the anim system and depsgraph to cope better with
timing issues.
- Game engine G.scene should become an argument for staring it.
Didn't solve this yet.
- Texture nodes should get scene cfra, but the current implementation
is too tightly wrapped to do it easily.
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about particle integration - should be copy-paste) see http://dldw.de/tmp/index.php?file=w2.blend (press play button in timeline and change the absorption value ob the cube) b) fixed deflector/collision bug with continues physics c) cloth wind/forces uses masses now d) even faster collision object gathering e) have fun ;)
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BLI_kdopbvh (just like kdtree interface now), huge speedup for selfcollisions, also better normal collisions (merge from cloth branch)
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system (better + general access to kdop, uses less memory, put it into BLI_* namespace and usage defined like existing BLI_kdtree_*). Deleted old kdop.c
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blocks that were previously missed; and b) greatly increase my
ohloh stats!
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cloth settings in old files but I had to do it before release because naming convention was really bad in cloth (e.g. using SimulationSettings instead of ClothSimSettings in DNA). Same for some structure in CollisionModifier but with no sideeffects.
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line and also another case where you startet from an unsaved blend and switched to a saved one; Cloth: Fixid mass init, little speedup for collisions; Collision Modifier: More generalized it
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