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Animation: blend offset slider #106518

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AresDeveaux wants to merge 12 commits from AresDeveaux/blender:blend_offset_slider into main
pull from: AresDeveaux/blender:blend_offset_slider
merge into: blender:main

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AresDeveaux commented 2023-04-04 05:01:54 +02:00
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New operator for the slider tool in the Graph Editor.

It shifts selected keys to the value of the neighboring keys as a block. It is used to keep the animation of the selected segment but match the values to the chosen neighboring pose.

It uses the structure already created by @ChrisLend. The main functionality chancge is in 'keyframes_general.c', the rest for the most part just follows what hi did.

New operator for the slider tool in the Graph Editor. It shifts selected keys to the value of the neighboring keys as a block. It is used to keep the animation of the selected segment but match the values to the chosen neighboring pose. It uses the structure already created by @ChrisLend. The main functionality chancge is in 'keyframes_general.c', the rest for the most part just follows what hi did.
blend_offset.gif
1.2 MiB
blend_offset.gif
AresDeveaux added 4 commits 2023-04-04 05:02:05 +02:00
Nate Rupsis added the
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Nate Rupsis added this to the Animation & Rigging project 2023-04-06 20:57:42 +02:00
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AresDeveaux changed title from WIP: Animation&Rigging: blend_offset_slider to Animation: blend offset slider 2023-04-10 05:33:57 +02:00
AresDeveaux added 1 commit 2023-04-11 00:45:13 +02:00
Christoph Lendenfeld requested changes 2023-04-13 12:33:24 +02:00
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minor comments :)

minor comments :)
source/blender/editors/animation/keyframes_general.c Outdated
@ -494,0 +496,4 @@
const BezTriple *left_key = fcurve_segment_start_get(fcu, segment->start_index);
const BezTriple *right_key = fcurve_segment_end_get(fcu, segment->start_index + segment->length);
const BezTriple *segment_first_key = fcurve_segment_start_get(fcu, segment->start_index + 1);
Christoph Lendenfeld commented 2023-04-13 12:25:25 +02:00
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this can be simplified to fcu->bezt[segment->start_index]
same for getting the segment end

this can be simplified to `fcu->bezt[segment->start_index]` same for getting the segment end
source/blender/editors/animation/keyframes_general.c Outdated
@ -494,0 +504,4 @@
const bool slider_right_side = factor > 0.5;
/* For this tool the calculations are made easier if each side of the slider goes from 0 to
* porisive 1. */
Christoph Lendenfeld commented 2023-04-13 12:30:16 +02:00
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watch out for typos poritive -> positive

watch out for typos poritive -> positive
source/blender/editors/animation/keyframes_general.c Outdated
@ -494,0 +509,4 @@
float y_delta;
if (slider_right_side) {
Christoph Lendenfeld commented 2023-04-13 12:33:00 +02:00
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if you use ED_slider_is_bidirectional_set you can just say factor > 0 and remove the boolean
That way this function doesn't even need to have an implicit notion of where the value came from

if you use `ED_slider_is_bidirectional_set` you can just say `factor > 0` and remove the boolean That way this function doesn't even need to have an implicit notion of where the value came from
AresDeveaux commented 2023-04-14 10:02:45 +02:00
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I just tried this. One problem with a bidirectional slider is that the factor is always going to be more than zero, so the else part of the if statement is never executed. I still need to know what side of the slider the value is coming from. If the factor is from 0 to 1 I can, and by using ping_pong_factor = fabs(factor * 2 - 1) I have been simulating what now I should call "bidirectional_factor" instead of "ping_pong_factor"

If there is a way to know what side of the slider the value is coming from I could use ED_slider_is_bidirectional_set

I just tried this. One problem with a bidirectional slider is that the factor is always going to be more than zero, so the `else` part of the if statement is never executed. I still need to know what side of the slider the value is coming from. If the factor is from 0 to 1 I can, and by using `ping_pong_factor = fabs(factor * 2 - 1)` I have been simulating what now I should call "bidirectional_factor" instead of "ping_pong_factor" If there is a way to know what side of the slider the value is coming from I could use `ED_slider_is_bidirectional_set`
Christoph Lendenfeld commented 2023-04-14 15:29:15 +02:00
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hm sorry I think that was my bad. I thought this would set the slider to a -1/1 range but it does not. It just allows negative values.
In that case your implementation is correct until we add that feature to the slider :)

hm sorry I think that was my bad. I thought this would set the slider to a -1/1 range but it does not. It just allows negative values. In that case your implementation is correct until we add that feature to the slider :)
AresDeveaux added 1 commit 2023-04-14 08:08:48 +02:00
AresDeveaux added 1 commit 2023-04-14 11:18:30 +02:00
AresDeveaux added 1 commit 2023-04-14 11:20:34 +02:00
AresDeveaux requested review from Christoph Lendenfeld 2023-04-14 19:44:52 +02:00
AresDeveaux commented 2023-04-14 19:45:28 +02:00
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I simplified the code as per your suggestions.

I simplified the code as per your suggestions.
AresDeveaux added 1 commit 2023-04-18 06:04:56 +02:00
AresDeveaux commented 2023-04-18 06:08:49 +02:00
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So, I was wrong (no surprise there). Bidirectional slider work as expected. I did something wrong before for it not to work. I'm guessing I left fabs(factor) before the if statement. Anyway, it doesn't matter because I just added it and it works like a charm.

So, I was wrong (no surprise there). Bidirectional slider work as expected. I did something wrong before for it not to work. I'm guessing I left `fabs(factor)` before the `if` statement. Anyway, it doesn't matter because I just added it and it works like a charm.
Christoph Lendenfeld approved these changes 2023-04-20 12:36:57 +02:00
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thanks for the work!
this also gets my green tick and I'll let sybren have a final look

thanks for the work! this also gets my green tick and I'll let sybren have a final look
Christoph Lendenfeld requested review from Sybren A. Stüvel 2023-04-20 12:37:05 +02:00
AresDeveaux added 1 commit 2023-04-20 21:47:14 +02:00
Sybren A. Stüvel added 2 commits 2023-05-09 16:23:59 +02:00
Sybren A. Stüvel requested changes 2023-05-09 16:53:06 +02:00
source/blender/editors/animation/keyframes_general.c
@ -482,0 +485,4 @@
const BezTriple *right_key = fcurve_segment_end_get(fcu, segment->start_index + segment->length);
const BezTriple segment_first_key = fcu->bezt[segment->start_index];
const BezTriple segment_last_key = fcu->bezt[segment->start_index + segment->length - 1];
Sybren A. Stüvel commented 2023-05-09 16:39:24 +02:00
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left_key and segment_first_key are only used when factor <= 0, and right_key and segment_last_key otherwise. Move these into the corresponding if/else bodies, so that their scope is clear.

`left_key` and `segment_first_key` are only used when `factor <= 0`, and `right_key` and `segment_last_key` otherwise. Move these into the corresponding `if`/`else` bodies, so that their scope is clear.
source/blender/editors/animation/keyframes_general.c
@ -482,0 +496,4 @@
}
for (int i = segment->start_index; i < segment->start_index + segment->length; i++) {
const float key_y_value = fcu->bezt[i].vec[1][1] + y_delta * fabs(factor);
Sybren A. Stüvel commented 2023-05-09 16:40:42 +02:00
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Since ``y_delta * fabs(factor)` doesnt' change over the course of this loop, take it out of the loop:

const float weighted_delta = y_delta * fabs(factor);
Since ``y_delta * fabs(factor)` doesnt' change over the course of this loop, take it out of the loop: ```c const float weighted_delta = y_delta * fabs(factor); ```
source/blender/editors/include/ED_keyframes_edit.h
@ -439,6 +439,7 @@ void smooth_fcurve_segment(struct FCurve *fcu,
int kernel_size,
double *kernel);
void ease_fcurve_segment(struct FCurve *fcu, struct FCurveSegment *segment, float factor);
void blend_offset_fcurve_segment(struct FCurve *fcu, struct FCurveSegment *segment, float factor);
Sybren A. Stüvel commented 2023-05-09 16:44:27 +02:00
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The more functions we add here, the more important it becomes that they are documented. Could you write a doxygen-style comment for it, that explains what it does? Something like this:

/**
 * Shift the FCurve segment up/down so that it aligns with the key before/after
 * the segment.
 *
 * \param factor blend factor from -1.0 to 1.0. The sign determines whether the
 * segment is aligned with the key before or after the segment.
 */
The more functions we add here, the more important it becomes that they are documented. Could you write a doxygen-style comment for it, that explains what it does? Something like this: ```c /** * Shift the FCurve segment up/down so that it aligns with the key before/after * the segment. * * \param factor blend factor from -1.0 to 1.0. The sign determines whether the * segment is aligned with the key before or after the segment. */ ```
source/blender/editors/space_graph/graph_slider_ops.c
@ -970,0 +971,4 @@
/** \name Blend Offset Operator
* \{ */
static void blend_offset_graph_keys(bAnimContext *ac, const float factor)
Sybren A. Stüvel commented 2023-05-09 16:48:52 +02:00
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I suspect that more operators will have a structure that could be described as "call a function with a factor for each selected segment".

Instead of duplicating this code and changing which function it calls, I think it would be better to abstract that away a bit. Something like this:


typedef void (*SegmentOperationFunc)(FCurve *fcu, FCurveSegment *segment, float factor);

static void fcurve_for_each_segment(bAnimContext *ac,
                                    SegmentOperationFunc operation,
                                    const float factor)
{
  ListBase anim_data = {NULL, NULL};

  ANIM_animdata_filter(ac, &anim_data, OPERATOR_DATA_FILTER, ac->data, ac->datatype);
  LISTBASE_FOREACH (bAnimListElem *, ale, &anim_data) {
    FCurve *fcu = (FCurve *)ale->key_data;
    ListBase segments = find_fcurve_segments(fcu);

    LISTBASE_FOREACH (FCurveSegment *, segment, &segments) {
      operation(fcu, segment, factor);
    }

    ale->update |= ANIM_UPDATE_DEFAULT;
    BLI_freelistN(&segments);
  }

  ANIM_animdata_update(ac, &anim_data);
  ANIM_animdata_freelist(&anim_data);
}

static void blend_offset_graph_keys(bAnimContext *ac, const float factor)
{
  fcurve_for_each_segment(ac, blend_offset_fcurve_segment, factor);
}

// other operators can then have a function like:
static void other_function_name(bAnimContext *ac, const float factor)
{
  fcurve_for_each_segment(ac, other_function_name_segment, factor);
}
I suspect that more operators will have a structure that could be described as "call a function with a factor for each selected segment". Instead of duplicating this code and changing which function it calls, I think it would be better to abstract that away a bit. Something like this: ```c typedef void (*SegmentOperationFunc)(FCurve *fcu, FCurveSegment *segment, float factor); static void fcurve_for_each_segment(bAnimContext *ac, SegmentOperationFunc operation, const float factor) { ListBase anim_data = {NULL, NULL}; ANIM_animdata_filter(ac, &anim_data, OPERATOR_DATA_FILTER, ac->data, ac->datatype); LISTBASE_FOREACH (bAnimListElem *, ale, &anim_data) { FCurve *fcu = (FCurve *)ale->key_data; ListBase segments = find_fcurve_segments(fcu); LISTBASE_FOREACH (FCurveSegment *, segment, &segments) { operation(fcu, segment, factor); } ale->update |= ANIM_UPDATE_DEFAULT; BLI_freelistN(&segments); } ANIM_animdata_update(ac, &anim_data); ANIM_animdata_freelist(&anim_data); } static void blend_offset_graph_keys(bAnimContext *ac, const float factor) { fcurve_for_each_segment(ac, blend_offset_fcurve_segment, factor); } // other operators can then have a function like: static void other_function_name(bAnimContext *ac, const float factor) { fcurve_for_each_segment(ac, other_function_name_segment, factor); } ```
Christoph Lendenfeld commented 2023-05-09 21:17:05 +02:00
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this exists from a recent refactor: apply_fcu_segment_function

this exists from a recent refactor: `apply_fcu_segment_function`
🚀 1
source/blender/editors/space_graph/graph_slider_ops.c
@ -970,0 +992,4 @@
ANIM_animdata_freelist(&anim_data);
}
static void blend_offset_draw_status_header(bContext *C, tGraphSliderOp *gso)
Sybren A. Stüvel commented 2023-05-09 16:51:47 +02:00
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I think this can be rewritten to call common_draw_status_header().

I think this can be rewritten to call `common_draw_status_header()`.
Christoph Lendenfeld self-assigned this 2023-07-27 18:57:59 +02:00
Christoph Lendenfeld commented 2023-08-18 16:27:43 +02:00
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this feature has been added in this PR #110544: Animation: Blend Offset Slider

this feature has been added in this PR [#110544: Animation: Blend Offset Slider](https://projects.blender.org/blender/blender/pulls/110544)

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