GP 3.0: More conversions of the legacy grease pencil data. #106822

New Issue

Currently, the following data between the old and new data-block is converted:

Point attributes:

position (or x,y, and z)
radius (or pressure, currently is saved pre-multiplied by the stroke thickness)
opacity (or strength)
selection (from the flag > GP_SPOINT_SELECT)

Stroke (curve) attributes:

cyclic (from the flag > GP_STROKE_CYCLIC)
material_index (or mat_nr)

Frame data:

frame_number (previously framenum)

There is more data that needs to be converted:

Point attributes:

time: seconds since start of drawing the stroke (should maybe be saved as delta between points?)
uv_rot: rotation of this point (for dot material mode)
vert_color: vertex color

(Note: uv_fac, and uv_fill can be calculated at runtime)

Stroke attributes:

~~thickness: thickness of the stroke~~
inittime: creation time of the stroke
caps: end caps flags (should probably be two boolean attributes for front and back)
hardness: controls the gradient falloff from the center line to the outer edge of the stroke
aspect_ratio[2]: x-y factor for dot shapes (why is this not a single factor?)
~~fill_opacity_fac: Opacisty factor for fills~~
uv_rotation, uv_translation, uv_scale : For fills
vert_color_fill: Fill "vertex" color.

(Note: There are a lot of fields in the stroke that is actually runtime data. Like triangles, boundbox, select_index)

Frame data (to be stored in the layer map):

selection: frame selection
key_type: keyframe type shown in the UI

Layer data:

hide, locked, select, use_lights
active: This layer is active (should be stored as an index and a reference at runtime)
parent, parsubstr: the parent object (could be a bone by name)
line_change: Thickness adjustment
tintcolor
opacity
viewlayername: Name of the layer used to filter render output.
blend_mode
~~gstep, gstep_next, gcolor_prev, gcolor_next: Onion skinning data~~ Only used by annotations.
mask_layers: list of mask layers (how to convert this?)
location, rotation, scale: layer transforms

bGPdata:

~~pixfactor~~ (should probably be baked into the radius on the points and be replaced by using a thickness modifier)
~~vertex_group_names, vertex_group_active_index~~ Needs to be moved to CurvesGeometry.
onion_factor, onion_mode, onion_flag, onion_keytype
~~grid~~ (Should become a overlay setting. Idea: Use the object viewport display color for the grid color. Scale the grid to the bounding box of the object to make sure it is covered.)

Currently, the following data between the old and new data-block is converted: Point attributes: * `position` (or `x`,`y`, and `z`) * `radius` (or `pressure`, currently is saved pre-multiplied by the stroke thickness) * `opacity` (or `strength`) * `selection` (from the `flag` > `GP_SPOINT_SELECT`) Stroke (curve) attributes: * `cyclic` (from the `flag` > `GP_STROKE_CYCLIC`) * `material_index` (or `mat_nr`) Frame data: * `frame_number` (previously `framenum`) There is more data that needs to be converted: **Point attributes**: - [x] `time`: seconds since start of drawing the stroke (should maybe be saved as delta between points?) - [x] `uv_rot`: rotation of this point (for dot material mode) - [x] `vert_color`: vertex color (Note: `uv_fac`, and `uv_fill` can be calculated at runtime) **Stroke attributes**: - [x] ~~`thickness`: thickness of the stroke~~ - [x] `inittime`: creation time of the stroke - [x] `caps`: end caps flags (should probably be two boolean attributes for front and back) - [x] `hardness`: controls the gradient falloff from the center line to the outer edge of the stroke - [x] `aspect_ratio[2]`: x-y factor for dot shapes (why is this not a single factor?) - [x] ~~`fill_opacity_fac`: Opacisty factor for fills~~ - [x] `uv_rotation`, `uv_translation`, `uv_scale` : For fills - [x] `vert_color_fill`: Fill "vertex" color. (Note: There are a lot of fields in the stroke that is actually runtime data. Like `triangles`, `boundbox`, `select_index`) **Frame data** (to be stored in the layer map): - [x] `selection`: frame selection - [x] `key_type`: keyframe type shown in the UI **Layer data**: - [x] `hide`, `locked`, `select`, `use_lights` - [x] `active`: This layer is active (should be stored as an index and a reference at runtime) - [x] `parent`, `parsubstr`: the parent object (could be a bone by name) - [x] `line_change`: Thickness adjustment - [x] `tintcolor` - [x] `opacity` - [x] `viewlayername`: Name of the layer used to filter render output. - [x] `blend_mode` - [x] ~~`gstep`, `gstep_next`, `gcolor_prev`, `gcolor_next`: Onion skinning data~~ Only used by annotations. - [x] `mask_layers`: list of mask layers (how to convert this?) - [x] `location`, `rotation`, `scale`: layer transforms **bGPdata**: - [x] ~~`pixfactor`~~ (should probably be baked into the `radius` on the points and be replaced by using a thickness modifier) - [x] ~~`vertex_group_names`, `vertex_group_active_index`~~ Needs to be moved to `CurvesGeometry`. - [x] `onion_factor`, `onion_mode`, `onion_flag`, `onion_keytype` - [x] ~~`grid`~~ (Should become a overlay setting. Idea: Use the object viewport display color for the grid color. Scale the grid to the bounding box of the object to make sure it is covered.)

aspect_ratio could be a single float
vertex_paint_opacity is always 1.0 because is was replaced by overlay value, so it can be removed. This prop is not visible in the UI.

About layer active.... do we want save this as today? if we put in runtime this setting will not be saved.

Onion Skinning parameters would be moved to a separated "sub" struct to keep things organized... now it's not easy to know what is for onion and what not.

`aspect_ratio` could be a single float `vertex_paint_opacity` is always 1.0 because is was replaced by overlay value, so it can be removed. This prop is not visible in the UI. About layer active.... do we want save this as today? if we put in runtime this setting will not be saved. Onion Skinning parameters would be moved to a separated "sub" struct to keep things organized... now it's not easy to know what is for onion and what not.

This commit 0b9a5381f9 adds the frame data and also converts it.

This commit https://projects.blender.org/blender/blender/commit/0b9a5381f94bb203d15829ac431cb29591f66764 adds the frame data and also converts it.

This commit c72ade033d adds the active layer functionality.

This commit https://projects.blender.org/blender/blender/commit/c72ade033d872f4eecac0f78c3c2143716a7a650 adds the active layer functionality.

All the conversions (except for the weights which needs to happen in CurvesGeometry) have been committed.

All the conversions (except for the weights which needs to happen in `CurvesGeometry`) have been committed.

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GP 3.0: More conversions of the legacy grease pencil data. #106822