Experimental option for the Reproject Strokes operator to project strokes on to
geometry, instead of only doing this in a planar (i.e. parallel to viewplane) way.
The current implementation is quite rough, and may need to be improved before it
is really ready for use. Potential issues:
* Loss of precision (i.e. stairstepping artifacts) from the 3D -> 2D -> 3D conversion
as we don't have float version of one of the projection funcs
* Jagged depth if there are gaps, since it will default back to the 3d-cursor plane
if no geometry was found (instead of doing some fancy interpolation scheme)
* I'm not sure if it's that useful for adapting GP strokes to deforming geometry yet...
This operator adds a new frame with nothing in it on the current frame.
If there is already a frame there, all existing frames are shifted one frame later.
Quite often when animating, you may want a quick way to get a blank frame,
ready to start drawing something new. Or maybe you just need a quick way to
add a "placeholder" frame so that a suddenly-appearing element does not show
up before its time.
* Reshuffled some blocks of code for better ease of navigation/flow in the file
* Improved some tooltips
* Removed "Helper" tag from some functions that serve bigger roles
* Fixed some errant formatting
The interpolation operators (and their associated code) occupied a significant
portion of gpencil_edit.c (which was getting a bit heavy). So, it's best to split
these out into a separate file to make things easier to handle, in preparation
for some further dev work.
When the parent object matrix change after the layer was parented, the
inverse matrix for strokes must be updated when editing strokes or the
transformations will be wrong.
In some situations the artist needs to subdivide a stroke created with
few points before, specially for sculpting.
The subdivision is done for any pair of continuous selected points in
the same stroke.
The operator can be activated in edit mode with W key and has a
parameter for number of cuts.
Now the factor works similar to other Blender areas to make the factor
more consistent for artists. The value 0% means equal to original
stroke, 100% equal to final stroke (50% means half way). Any value below
0% or greater than 100% create an overshoot of the stroke.
Two new modal operators to create a grease pencil interpolate drawing
for one frame or a complete sequence between two frames. For drawing
the temporary strokes in the viewport, two drawing handlers have been
added to manage 3D and 2D stuff.
Video: https://youtu.be/qxYwO5sSg5Y
The operator shortcuts are Ctrl+E and Ctrl+Shift+E. During the modal
operator, the interpolation can be adjusted using the mouse (moving
left/right) or the wheel mouse.
We usually don't silence migh-be-uninitialized warning (which is the only
thing which could explain setting matrix to all zeroes) so we can catch
such errors when using tools like Valgrind.
I don't get warning here and the initializer was wrong, so removing it.
If it-s _REALLY_ needed please do a proper initialization.
This was because the poll callback was checking for the presence of an active layer.
If you just create an empty datablock and try to paste, nothing would happen.
However, this check was kindof redundant anyway, as the operator would add a layer for
you if it didn't find one.
(Later this calculation should be moved into the iteration macro instead, since
it only needs to be applied once per layer along with the diff_mat calculation)
A common problem encountered by artists was that they would accidentally move
the 3D cursor while drawing, causing their strokes to end up in weird places in
3D space when viewing the drawing again from other perspectives.
This operator helps fix up this mess by taking the selected strokes, projecting them
to screenspace, and then back to 3D space again. As a result, it should be as if
you had directly drawn the whole thing again, but from the current viewpoint instead.
Unfortunately, if there was originally some depth information present (i.e. you already
started reshaping the sketch in 3D), then that will get lost during this process.
But so far, my tests indicate that this seems to work well enough.
General reshuffling of defines and spacing/brace usage for consistency.
In particular:
* When defining types, don't mix pointers and non-pointer types on same line
to avoid confusion
* As much as possible, have all defines at the top of each block instead of
scattered haphazardly throughout the code
* Stroke editing functions should be in gpencil_edit.c not gpencil_data.c
(the latter is only for handling "CRUD" operations on things like
layers, brushes, and palettes)
* Deduplicate the GP_STROKE_BUFFER_MAX define
This function is only really secure in a very limited amount of cases,
and can especially bite you later if you change some buffer sizes...
So not worth bothering with it, just always use BLI_strncpy instead.
This new operator will delete any GP frame it finds on the current frame, regardless
of whether it's on the active layer or not. It will only remove the frames if the
layer is editable, but otherwise, it will just go for it.
The existing operator is great for use in the panel (where it only applies to the active
frame), but it was not so good for all the other places where tools can be invoked
(e.g. D-X, or Delete) as you're typically thinking about the whole scene more holisticaly
than just caring about a particular layer.
* Fix "Attempt to free NULL pointer" when copying strokes for the first time
* Fix poll callback on "paste" operator, so that it is possible to paste
strokes when there are no editable strokes visible.
There is still some instability in how the triangulations are happening,
where the triangle count of the resulting triangulation fluctuates resulting
in weird artifacts sometimes.
To reproduce, try drawing some U-shapes, and keep reloading the file.
Improve filling for concave shapes using a triangulation of the stroke.
The triangulation information is saved in an internal cache and only is
recalculated if the stroke changes.
The triangulation is not saved in .blend file.
Reviewers: aligorith
Maniphest Tasks: T47102
Differential Revision: https://developer.blender.org/D1705
* Added a new API function to test if a GPencil layer is visible or not
* Replaced all editability checks with this new "super check"
* Replaced all magic number thresholds for opacity visiblity with a single define
- 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`.
* Moved the context handling stuff into gpencil_utils.c
* Moved the datablock and layer operators out into their own file too. Again,
these weren't related to the other stuff that much
* Split the GPencil to Curves operator out into its own file (gpencil_convert.c).
This was quite a massive blob of code (48kb) that was not that related to the
other operators still in that file (gpencil_edit.c)
There was a problem with the copy/paste functionality, where it would be possible to
paste 3d strokes into 2D editors, or 2D strokes into the 3D view. The problem with
that though is that these will not show up, and because there's no feedback at the
time, users may end up doing this pasting several times.
The problem here was that when a Grease Pencil datablock is shared between
the 3D view and another one of the editors, all the strokes were getting handled
by the editing operators, even if those strokes could not be displayed/used
in that context. As a result, the coordinate conversion methods would fail,
as some of the needed data would not be set.
The fix here involves not including any offending strokes in such cases...
