This commit adds a float selection to curve control points or curves,
a sculpt tool to paint the selection, and uses the selection influence
in the existing sculpt brushes.
The selection is the inverse of the "mask" from mesh sculpt mode
currently. That change is described in more detail here: T97903
Since some sculpt tools are really "per curve" tools, they use the
average point selection of all of their points. The delete brush
considers a curve selected if any of its points have a non-zero
selection.
There is a new option to choose the selection domain, which affects how
painting the selection works. You can also turn the selection off by
clicking on the active domain.
Sculpt brushes can be faster when the selection is small, because
finding selected curves or points is generally faster than the
existing brush intersection and distance checks.
The main limitation currently is that we can't see the selection in the
viewport by default. For now, to see the selection one has to add a
simple material to the curves object as shown in the differential
revision. And one has to switch to Material Preview in the 3d view.
Differential Revision: https://developer.blender.org/D14934
For the "Sphere" 3D brushes, the depth and radius are only sampled at
the beginning of the stroke. This didn't work when tablet pressure is
used as a factor for the brush radius. Now the 3D brush depth is found
with the max radius (as if the pressure was 1.0), but the pressure
factor is used afterwards.
Restructuring the way the brush executors stored the radius made
the change a bit clearer, which is where most of the diff comes from.
Differential Revision: https://developer.blender.org/D15002
Multiply the radius and strength of sculpt brushes by the pressure
when "use pressure" is turned on. The brush system isn't responsible
for this, so the pressure needs to be stored in `StrokeExtension`.
Differential Revision: https://developer.blender.org/D14996
This makes it much clearer what data is supposed to be modified
and what data is just used to influence the operation. The new
`BKE_paint_brush_for_read` function isn't great design, but it
can be removed or renamed if similar changes are applied to
more places.
Also pass pointers explicitly to `sample_curves_3d_brush` rather
than reusing the `bContext`. This makes it clearer what data the
function actually needs.
Differential Revision: https://developer.blender.org/D14967
This was one of multiple placeholder brushes to simplify development.
Having it is not necessary anymore.
It was a brush that could add new curves according to a specific density.
This functionality will be brought back as a new brush later.
Ref T97255.
Add "for_write" on function names that retrieve mutable data arrays.
Though this makes function names longer, it's likely worth it because
it allows more easily using the const functions in a non-const context,
and reduces cases of mistakenly retrieving with edit access.
In the long term, this situation might change more if we implement
attributes storage that is accessible directly on `CurvesGeometry`
without duplicating the attribute API on geometry components,
which is currently the rough plan.
Differential Revision: https://developer.blender.org/D14562
This adds a new Grow/Shrink brush which is similar to the Length
brush in the old hair system.
* It's possible to switch between growing and shrinking by hold
down ctrl and/or by changing the direction enum.
* 3d brush is supported.
* Different brush falloffs are supported.
* Supports scaling curves uniformly or shrinking/extrapolating
them. Extrapolation is linear only in this patch.
* A minimum length settings helps to avoid creating zero-sized curves.
Differential Revision: https://developer.blender.org/D14474
Rename "size" variables and functions to use "num" instead,
based on T85728 (though this doesn't apply to simple C++
containers, it applies here). Rename "range" to "points" in
some functions, so be more specific.
Differential Revision: https://developer.blender.org/D14431
This adds a new Add brush for the new curves object type in sculpt mode.
The brush is used to insert new curves (typically hair) on the surface object.
Supported features:
* Add single curve exactly at the cursor position when `Add Amount` is 1.
* Front faces only.
* Independent interpolate shape and interpolate length settings.
* Smooth and flat shading affects curve shape interpolation.
* Spherical and projection brush.
This also adds the `surface_triangle_index` and `surface_triangle_coordinate`
attributes. Those store information about what position on the surface each
added curve is attached to:
* `surface_triangle_index` (`int`): Index of the internal triangle that a curve
is attached to. `-1` when the curve is not attached to the surface.
* `surface_triangle_coordinate` (`float2`): First two numbers of a barycentric
coordinate that reference a specific position within the triangle.
Ref T96444.
Differential Revision: https://developer.blender.org/D14340
The exact behavior of the brushes is still being iterated on, but it
helps having a base implementation that we can work upon.
All of that is still hidden behind an experimental feature flag anyway.
The brushes will get a name in the ui soon.
Differential Revision: https://developer.blender.org/D14241
This adds a prototype for the first brush that can add new curves by
painting on a surface. Note that this can only be used when the curves
object has a surface object set in the properties panel.
The brush can take minimum distance into account. This allows
distributing curves with a somewhat consistent density.
Differential Revision: https://developer.blender.org/D14207
The main goal here is to add the boilerplate code to make it possible
to add the actual sculpt tools more easily. Both brush implementations
added by this patch are meant to be prototypes which will be removed
or refined in the coming weeks.
Ref T95773.
Differential Revision: https://developer.blender.org/D14180
Previously, all operators using `PaintStroke` would have to store
the stroke in `op->customdata`. That made it impossible to store
other operator specific data in `op->customdata` that was unrelated
to the stroke.
This patch changes it so that the `PaintStroke` is passed to api
functions as a separate argument, which allows storing the stroke
as a subfield of some other struct in `op->customdata`.
This adds the boilerplate code that is necessary to use the tool/brush/paint
systems in the new sculpt curves mode.
Two temporary dummy tools are part of this patch. They do nothing and
only serve to test the boilerplate. When the first actual tool is added,
those dummy tools will be removed.
Differential Revision: https://developer.blender.org/D14117
Hans Goudey
Jacques Lucke
Kévin Dietrich
Campbell Barton