Missing DNA Defaults ("Reset to Default Value" sets to 0) #80164

Since f5e0dfe59c, we have a simple & practical way of setting up defaults for DNA data. These defaults are used for the "Reset to Default Value" operator, available in the context menu for buttons.
Here's a helper script to extract the defaults: https://stackoverflow.com/a/55368203/432509

There are still a number of properties that don't have a default assigned. These can be reported here.

Note that these missing defaults typically appear in "groups" because the entire data-structure misses the default value definition. In that case there's no need to list each individual value, just mention where they are (e.g. Armature object, relation settings).

Changed status from 'Needs Triage' to: 'Confirmed'

Added subscriber: @JulianEisel

#99109 was marked as duplicate of this issue

#93656 was marked as duplicate of this issue

Added subscriber: @Gilberto.R

In the render properties tab, i think that Simplify is missing Default values for render and grease pencil dropdowns. Also Cycles tile sizes differ from startup file value after resetting.
In Output Properties tab it defaults output color to BW instead of RGB.
In Scene Properties tab it's missing default value for Units.
In Object Properties tab it's missing for Relations and Motion Paths.
It's also missing default values for constraints.

Added subscriber: @NicolaSap

All the sockets (including RGBA sockets, dropdowns, etc) default to 0.000 (or first element in the list¹) in all the nodes.

¹Only excepton I've found is that, in ColorRamp, interpolation correctly defaults to "Linear"

Edit: Maybe the issue with nodes is based on a different root cause, so probably this is not the right Task? See also: #76704

Added subscriber: @blenderrocket

Added subscriber: @HooglyBoogly

After some recent commits this should be working in more places:

There is still much more work to do. Maybe these commits could serve as helpful examples for anyone who wants to help out by making similar changes.

Added subscriber: @ketanjainn

This comment was removed by @ketanjainn

Added subscriber: @sidd017

Hi, Default values for radius and strength in brush properties of SculptDraw brush and detail size under dyntopo also seem to have incorrect default values. I'm new to Blender development and since this is a good first issue, I tried looking into this.

Radius : default on startup is 50px and reset to default value sets it to 0
Strength : default on startup is 0.5 and reset to default value sets it to 1
Dyntopo -> Detail Size : default on startup is 12.00px and reset to default value sets it to 0.00px (did annoy me a lot when I first tried sculpting)

From what I understand, default values are now defined under DNA_brush_defaults.h, but when I tried changing them it had no effect. The properties still had the old default values. I suspect some other implementation is overriding the DNA defaults, probably related to #47618 . Changing defaults like particle settings in DNA_particle_defaults.h, also seems to have no effect.
Can someone help me understand why changing default values in DNA_brush_defaults.h has no effect?

Added subscriber: @gaurivn

I would like to work on this issue.

Added subscriber: @George540

This comment was removed by @George540

Hi! I'm new to the Blender Development group and I decided to tackle this issue.

Currently changing the rna defaults for Simplify (Render Settings inCycles). The default for Texture limit dropdowns for Render and Viewport panels are at No Limit. Is that the correct default? If that's not the case, I think setting it to 2048 is ideal, since image textures already have a default size of 2048x2048 px

Added subscriber: @lichtwerk

Not sure if VSE can use this system? If so, then Sequence needs to be covered, see #90406 (VSE: The blend and opacity settings that strips are created with does not match the default values they revert back to)

Added subscriber: @OrestisKonstantinidis

Added subscriber: @SHREY-AGGARWAL

Added subscriber: @SteffenD

Added subscriber: @Diogo_Valadares

Added subscriber: @OmarEmaraDev

UnitSettings in DNA_scene needs default values. See #99109.

Added subscriber: @pixeltrain3d

Added subscriber: @ralphw

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Missing DNA Defaults ("Reset to Default Value" sets to 0) #80164