WIP: Fix #116458: Added decay factor for flattening brushes. #118699
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Julien Kaspar
Sergey Sharybin
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Previously the falloff curve was not used for the flattening effect Clay, Clay Strips, Flatten, Fill & Scrape brushes have. The full strength was always used for flattening, resulting in geometry in the outer radius of the brush being pulled just as strong as in the center.
This PR introduce a decay slider to scale the height and depth of the falloff along the Z axis of the area plane. Basically like the "Plane Trim" setting on Flatten brushes, but relative to the brush radius and with a falloff curve instead of as a bool.
That way the ripping of unwanted geometry can be reduced for Clay, Fill and Scrape brushes in the direction that suits them.
Credits:
Julien Kaspar
WIP Fix #116458 Added decay factor for flattening brushes.to WIP: Fix #116458: Added decay factor for flattening brushes.You'll need to make changes in
BKE_blender_version.hto bump theBLENDER_FILE_SUBVERSIONvalue since this is adding a new field to the DNA.Additionally, even though the
plane_trim_decayvalue here is initialized to 0, I think it's probably best to still add a new block setting the value explicitly toversioning_400.ccfor old files being loaded andversioning_defaults.ccfor thestartup.blend@ -44,6 +44,7 @@/* How far above or below the plane that is found by averaging the faces. */ \.plane_offset = 0.0f, \.plane_trim = 0.5f, \.plane_trim_decay = 0, \Nitpick:
0.0finstead of0to remain consistent with the rest of the file.@ -3011,6 +3011,15 @@ static void rna_def_brush(BlenderRNA *brna)"If a vertex is further away from offset plane than this, then it is not affected");RNA_def_property_update(prop, 0, "rna_Brush_update");prop = RNA_def_property(srna, "plane_trim_decay", PROP_FLOAT, PROP_DISTANCE);Based on your comment in the chat, I assume you wanted this to be a raw value instead of distance, the subtype here should be
PROP_NONEthen instead ofPROP_DISTANCE@ -3014,0 +3017,4 @@RNA_def_property_ui_text(prop,"Plane Trim Decay","If a vertex is away from offset plane, its deformation exponentially attenuates");This description is a bit confusing to me from a user perspective. I don't have a good suggestion for rewording it, but I think making it clear that this value is the strength (rate?) of the falloff would be clearer.
Thanks for the feedback, fixing asap
WIP: Fix #116458: Added decay factor for flattening brushes.to Fix #116458: Added decay factor for flattening brushes.A few thoughts I had about this recently: Would it make sense to combine this with the normal falloff options that already exist for brushes? Either in reusing the
CurveMappingconcept and / or in being grouped in the same part of theFalloffpanel.@blender-bot package
Package build started. Download here when ready.
I think I'm confused what this PR really does.
Based on the description I thought it would be a slider that scales the height/depth of the spherical falloff shape. Instead it's a falloff which alters the behavior of the Plane Trim. Unfortunately I couldn't get a desirable behavior from the Decay setting.
Since it's hard to see and explain based on the Clay brushes, here's the Flatten brush, with a Constant Falloff and Anchored stroke. The Plane Trim is on
0.11and Decay on20.It looks like it adds an additional falloff on top of the hard limit of the Plane Trim, resulting in a stepping effect. That second Decay falloff will always end on the brush radius, so it's not really improving the behavior.
Here's a mockup of what I had in mind (Using the Flatten brush with a Constant falloff as an example):
Basically by introducing a
heightanddepthsetting for the falloff, we could scale the influence in that particular direction. This is specifically useful for Clay, Scrape and Fill brushes because they have a prefered direction of influence.I'd like to note that the direction of the
depthshould always be the opposite of the 'direction' setting of the brush (or typically holdingCtrl).I'm not certain this approach would work but it's better to see after we tried.
Fix #116458: Added decay factor for flattening brushes.to WIP: Fix #116458: Added decay factor for flattening brushes.thanks for the feedback, In the current PR basically the farthest the vertex is from the sculpt plane (in the sculpt plane normal direction), the weakest it gets pulled. The falloff is exponential, as the other types of curves are "too soft" for preventing outer vertices from getting pulled.
Low decay values 0-10 will give a smooth falloff, while bigger values will act as a harder falloff trim
The clay strips brush don't have a falloff in Z direction, it uses a cube tests instead of a sphere of influence. I think the decay should be independent of a preexisting falloff shape or curve.
@farsthary I am a bit confused. Are there changes planned here to accomodate feedback from Julien, or do you believe this PR is ready for review and good to have, even though it might be solving slightly different problem?
Thanks for the explanation!
I think the current settings are not communicating this well.
We should also not tie this to the Plane Trim setting at all. That setting is doing something different and won't combine well with the concept of Decay.
The settings should be descriptive. A "Decay" slider that goes from 0 to 50 is very obscure from the user perspective.
From what you explained I'd expect sliders to control the depth and falloff curve of the "Decay" (Which as I understand refers specifically to the strength of the flattening effect).
I'd even call it "Flatten Depth" and "Flatten Hardness" to be more descriptive and consistent with existing UI terminology.
IMO we should ideally show 0-1 factor sliders.
The depth should also be relative to the brush radius to make it easy to understand. I don't know why a lot of these settings are currently showing meter units ... that could be something to tackle in another PR.
@Sergey Yes, I'm planning to include @JulienKaspar feedback in this PR, currently is in WIP since I will be iterating back and forth with him until achieved the expected behavior.
Cleaned up and incorporated feedback.
Flatten brush in anchored mode is improved a lot!
@JulienKaspar hope this update aligns better with your vision 👍
WIP: Fix #116458: Added decay factor for flattening brushes.to Fix #116458: Added decay factor for flattening brushes.@blender-bot package
Package build started. Download here when ready.
I tested this for a bit while sculpting objects with varying complexity. The current approach successfully mitigates the effect of sculpting nearby backsides and geometry further behind.
But sadly it also causes some nearby surfaces to also be excluded, if they are too deep behind the sculpt plane or when the sculpt plane orientation causes them to be missed. This happens frequently, especially if the start of the stroke is not deep enough.
I tried configuring the Depth slider to something that works but it is very context dependent on each geometry that is being sculpted.
So I don't think the approach that I suggested will work. I can't think of a better simple solution right now, sorry.
Maybe excluding geometry based on a geodesic falloff is the best approach after all.
Thanks for the testing and the feedback! I will add back the WIP tag and we can revisit again this PR once I implement geodesic distance brush action.
Fix #116458: Added decay factor for flattening brushes.to WIP: Fix #116458: Added decay factor for flattening brushes.After getting more familiarized with the code, we actually don't need mathematically accurate (and slower) geodesic distance brush influence for sculpting, we can achieve the same results using a fast topological set for the brush's influence.
I'll make the time to revisit and try implementing it soon.
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