The legacy algorithm only considers two adjacent points when computing
the bezier handles, which cannot produce satisfactory results. Animators
are often forced to manually adjust all curves.
The new approach instead solves a system of equations to trace a cubic spline
with continuous second derivative through the whole segment of auto points,
delimited at ends by keyframes with handles set by other requirements.
This algorithm also adjusts Vector handles that face ordinary bezier keyframes
to achieve zero acceleration at the Vector keyframe, instead of simply pointing
it at the adjacent point.
Original idea and implementation by Benoit Bolsee <benoit.bolsee@online.be>;
code mostly rewritten to improve code clarity and extensibility.
Reviewers: aligorith
Differential Revision: https://developer.blender.org/D2884
Now all consistent and using term "properties region" instead of "properties panel". Ideally we had a more generic operator for all those.
Fixes T49006.
Drivers can use this to refer to the data which the driver is applied to,
useful for objects, bones, to avoid having to create a variable pointing to its self.
This commit aims to streamline the driver variables layout a bit
* Each variable type now has an icon. (The loc diff and rot diff ones are placeholders,
which could deserve something better/dedicated if we continue to use this)
* Instead of taking up an entire row, the variable type dropdown now only shows
an icon, and is located before the variable name field.
Feedback wanted: Is this more/less confusing than it was?
This was a feature request from a few years back (IIRC from ZanQdo?) to make it
easier to reuse one set of driver variables across several different drivers.
Dev Notes:
* Finally it's done! All that trouble for two little buttons.
* Grr... cmake... grrr!
This brings the UI here more in line with the Constraints and Modifiers UI's.
TODO:
* The tooltips/descriptions on the operators now need fixing, as we can no longer
use custom tooltips when defining these buttons.
* The operators need to be fixed to only operate on the active data
This change means that when going from having no FCurves active to having
an active FCurve, the properties panels will not get stuck with only showing
the "View" tab, which is not that useful a lot of the time.
When attempting to change a driver variable name to an "invalid" name,
an indicator will now be shown beside the offending variable name.
Clicking on this icon will show a popup which provides more information
about why the variable name cannot be used.
Reasons that it knows about are:
1) Starts with number
2) Has a dot
3) Has a space
4) Starts with or contains a special character
5) Starts with an underscore (Python does allow this, but it's bad practice,
and makes checking security of drivers harder)
6) Is a reserved Python keyword
When working is the Graph Editor it can be very important to be able to work with fractions
(sub integers), especially when working with Drivers. Currently the "Cursor Y" is hooked up
to "cursor_position_y" which allows fractions but "Cursor X" is directly hooked up to
"frame_current" which is an integer.
This commit adds initial support for this feature.
* When in Drivers mode, the x-part of the cursor is mapped to a new "cursor_position_x"
value which can have fractional values. Animation mode however remains mapped to frame_current
* This commit only adds the UI/property/drawing tweaks needed to support this.
Many operators still need to be modified to consider this value instead of the
current frame, for this to be more useful.
- Add blentranslation `BLT_*` module.
- moved & split `BLF_translation.h` into (`BLT_translation.h`, `BLT_lang.h`).
- moved `BLF_*_unifont` functions from `blf_translation.c` to new source file `blf_font_i18n.c`.
Make the UI API more consistent and reduce confusion with some naming.
mainly:
- API function calls
- enum values
some internal static functions have been left for now
Editing the y-coordinate of the right handle of a keyframe via the Active Keyframe
panel in the Graph Editor, while both handles are selected and are both of type "aligned"
resulted in weird behaviours such as the x-coordinate of the right handle changing
(and rapidly starting to overshoot) but nothing else. However, this problem
doesn't occur when only a single handle is selected.
It turns out that the "order of computation" logic in calchandleNurb_intern() gets
confused in the case of both handles being selected, and results in a sub-optimal
handling of the right handle being the one that's been changed. We hack around this
here by temporarily making it so that just the right handle is selected when doing
the updates here.
Inspired by T39315, this commit adds a few more driver "linting" messages used for
providing users with tips on how to use drivers better. This time, we specifically
address 2 cases:
1) Drivers being abused for procedural animation, due to the misconception that
procedurally generating F-Curves using F-Modifiers means that drivers are needed
to wire such procedural motion-sources to properties.
2) Setting up Average/Sum/Min/Max driver types without any input variables - you can't
expect anything to happen (unless of course, your intention was to lock the property
to 0.0)
This commit introduces support for a number of new interpolation types
which are useful for motion-graphics work. These define a number of
"easing equations" (basically, equations which define some preset
ways that one keyframe transitions to another) which reduce the amount
of manual work (inserting and tweaking keyframes) to achieve certain
common effects. For example, snappy movements, and fake-physics such
as bouncing/springing effects.
The additional interpolation types introduced in this commit can be found
in many packages and toolkits (notably Qt and all modern web browsers).
For more info and a few live demos, see [1] and [2].
Credits:
* Dan Eicher (dna) - Original patch
* Thomas Beck (plasmasolutions) - Porting/updating patch to 2.70 codebase
* Joshua Leung (aligorith) - Code review and a few polishing tweaks
Additional Resources:
[1] http://easings.net
[2] http://www.robertpenner.com/easing/
In order to combat the problem of users frequently trying to use inlined
bpy.data/bpy.context paths for data access in their driver expressions
and then finding/complaining that these don't update correctly, the UI
now flags these as the error conditions that they are (with suggestions
on how to fix this).
Also tweaked the "Add Variable" button to have more descriptive text about
what exactly variables are and why to use these, along with some other
visual tweaks (icons!).
Most of the places which relied on RNA_path_resolve() did so believing that if
it returned true, that it had found a valid property, and that the returned
pointer+property combination would be what the path referred to. However, it
turns out that if the property at the end of the path turns out to be a
"pointer" property (e.g. "data" for Object.data), this would automatically
become the pointer part, while the prop part would be set to null. Hence, if a
user accidentally (or otherwise) specifies a path for the single-property driver
variable type like this, then Blender would crash.
This commit introduces two convenience functions - RNA_path_resolve_property()
and RNA_path_resolve_property_full() - which mirror/wrap the existing
RNA_path_resolve() functions. The only difference though is that these include a
check to ensure that what was found from resolving the path was in fact a
property (they only return true iff this is the case), and make it explicitly
clear in the name that this is what they will do so that there's no further
confusion. It is possible to do without these wrapper functions by doing these
checks inline, but the few cases that had been patched already were pretty
hideous looking specimens. Using these just make it clearer and simpler for all.
I've also beefed up the docs on these a bit, and changed these to using bools.
in the UI
This is the second part of the fixes for [#32492], making it easier to identify
which part of a driver (i.e. which of its targets) is causing problems
A number of additional/related changes needed to be made:
* Red-alert status for layouts is now propagated down to child layouts when they
are created. This is needed as otherwise some of the templates used in the Graph
Editor driver settings won't actually get the red-alert status flushed down to
them. Also, note that this status needs to be set before any widgets are added
to the layout, or else the settings aren't applied when the relevant widgets get
created.
* "Single Property" RNA-Paths resulting in out of bounds array access will now
trigger an error status and appropriate warnings
TODO:
* The error tagging doesn't get applied immediately after variables are created,
or their types changed
* There was also some other weirdness involved when a higher-value flag (1<<10)
was used for this setting, which needs further attention
besides performance in some cases.
* DAG_scene_sort is now removed and replaced by DAG_relations_tag_update in
most cases. This will clear the dependency graph, and only rebuild it right
before it's needed again when the scene is re-evaluated.
This is done because DAG_scene_sort is slow when called many times from
python operators. Further the scene argument is not needed because most
operations can potentially affect more than the current scene.
* DAG_scene_relations_update will now rebuild the dependency graph if it's not
there yet, and DAG_scene_relations_rebuild will force a rebuild for the rare
cases that need it.
* Remove various places where ob->recalc was set manually. This should go
through DAG_id_tag_update() in nearly all cases instead since this is now
a fast operation. Also removed DAG_ids_flush_update that goes along with
such manual tagging of ob->recalc.
Specifically the Rotational Difference and XYZ Rotation Transform Channel
Feature requested during BlenderPRO 2012 (Brazilian Blender Conference)
and coded during my flight back :)
Reviewed by Joshua Leung(Aligorith)
