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Animation: blend to infinity slider #106517

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AresDeveaux wants to merge 15 commits from AresDeveaux/blender:blend_to_infinity_slider into main
pull from: AresDeveaux/blender:blend_to_infinity_slider
merge into: blender:main

When changing the target branch, be careful to rebase the branch in your fork to match. See documentation.
Conversation 12 Commits 15 Files Changed 6 +25 -30
1 changed files with 25 additions and 30 deletions
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source/blender/editors/animation/keyframes_general.c
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@ -496,69 +496,64 @@ void blend_to_infinity_fcurve_segment(FCurve *fcu, FCurveSegment *segment, const
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);
/* One key on the outside of the neighboring keys is needed to use as reference. */
const BezTriple *beyond_left_key = fcurve_segment_start_get(fcu, segment->start_index - 1);
const BezTriple *beyond_right_key = fcurve_segment_end_get(
fcu, segment->start_index + segment->length + 1);
/* The calculation needs diferent values for each side of the slider. */
const bool slider_right_side = factor >= 0.5;
const bool slider_left_side = factor < 0.5;
/* The factor goes from 0 to 1, but for this tool it needs to go from 0 to 1 on each side of the
* slider. */
const float ping_pong_factor = fabs(factor * 2 - 1);
float x_delta = 0;
float y_delta = 0;
float x_delta = 1;
float y_delta = 1;
/* This delta values are used to know the relationship between the bookend keys and the
/* This delta values are used to get the relationship between the bookend keys and the
* reference keys beyong those. */
if (slider_right_side) {
/* Stop the fucntion if there is no key beyond the the right neighboring one. */
if (factor >= 0.5) {
/* Stop the function if there is no key beyond the the right neighboring one. */
if (segment->start_index + segment->length == fcu->totvert) {
return;
}
const BezTriple *beyond_right_key = fcurve_segment_end_get(
fcu, segment->start_index + segment->length + 1);
y_delta = beyond_right_key->vec[1][1] - right_key->vec[1][1];
x_delta = beyond_right_key->vec[1][0] - right_key->vec[1][0];
}
else if (slider_left_side) {
/* Stop the fucntion if there is no key beyond the left neighboring one. */
else {
/* Stop the function if there is no key beyond the left neighboring one. */
if (segment->start_index == 0) {
return;
}
const BezTriple *beyond_left_key = fcurve_segment_start_get(fcu, segment->start_index - 1);
y_delta = beyond_left_key->vec[1][1] - left_key->vec[1][1];
x_delta = beyond_left_key->vec[1][0] - left_key->vec[1][0];
}
else {
y_delta = 1;
x_delta = 1;
/* Avoids dividing by 0. */
if (x_delta == 0) {
return;
}
for (int i = segment->start_index; i < segment->start_index + segment->length; i++) {
float new_x_delta = 0;
float new_y_delta = 0;
float reference_y = 0;
float new_x_delta;
float new_y_delta;
const BezTriple *reference_key;
/* These new deltas are used to determine the relationship between the current key and the
* bookend ones. */
if (slider_right_side) {
if (factor >= 0.5) {
new_x_delta = fcu->bezt[i].vec[1][0] - right_key->vec[1][0];
reference_y = right_key->vec[1][1];
reference_key = right_key;
}
else {
new_x_delta = fcu->bezt[i].vec[1][0] - left_key->vec[1][0];
reference_y = left_key->vec[1][1];
reference_key = left_key;
}
/* We use compound rule of 3 to find the "Y" delta we are missing using the other deltas we
* know. */
if (x_delta != 0) {
new_y_delta = new_x_delta * y_delta / x_delta;
}
* know. */
new_y_delta = new_x_delta * y_delta / x_delta;
const float delta = reference_y + new_y_delta - fcu->bezt[i].vec[1][1];
const float delta = reference_key->vec[1][1] + new_y_delta - fcu->bezt[i].vec[1][1];
const float key_y_value = fcu->bezt[i].vec[1][1] + delta * ping_pong_factor;
move_key(&fcu->bezt[i], key_y_value);