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Armature: implement lengthwise scaling of B-Bone segments. 

Implement actual behavior for the B-Bone Y Scale channels added
to DNA and UI in the previous commit in addition to the existing
X and Z Scale inputs.

The two length scale inputs control the ratio between the lengths
of the start and end segments of the bone: although for convenience
two inputs are provided, the whole chain is still uniformly scaled
to fit the curve.

Differential Revision: https://developer.blender.org/D9870
This commit is contained in:
Alexander Gavrilov 2021-06-15 13:09:43 +03:00
parent 682a74e090
commit 638c16f410
Notes: blender-bot 2023-02-14 02:58:19 +01:00 
Referenced by issue #89621, Bendy bones saved in 3.0 break in older versions
Referenced by issue #83908, Streamlining advanced rigging of B-Bone chains.
1 changed files with 27 additions and 3 deletions
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30
source/blender/blenkernel/intern/armature.c
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@ -853,6 +853,7 @@ bool bone_autoside_name(
static void equalize_cubic_bezier(const float control[4][3],
int temp_segments,
int final_segments,
const float *segment_scales,
float *r_t_points)
{
float(*coords)[3] = BLI_array_alloca(coords, temp_segments + 1);
@ -877,12 +878,19 @@ static void equalize_cubic_bezier(const float control[4][3],
}
/* Go over distances and calculate new parameter values. */
float dist_step = pdist[temp_segments] / final_segments;
float dist_step = pdist[temp_segments];
float dist = 0, sum = 0;
for (int i = 0; i < final_segments; i++) {
sum += segment_scales[i];
}
dist_step /= sum;
r_t_points[0] = 0.0f;
for (int i = 1, nr = 1; i <= final_segments; i++) {
float dist = i * dist_step;
dist += segment_scales[i - 1] * dist_step;
/* We're looking for location (distance) 'dist' in the array. */
while ((nr < temp_segments) && (dist >= pdist[nr])) {
@ -1332,9 +1340,25 @@ int BKE_pchan_bbone_spline_compute(BBoneSplineParameters *param,
copy_v3_v3(bezt_controls[1], h1);
zero_v3(bezt_controls[0]);
/* Compute lengthwise segment scale. */
float segment_scales[MAX_BBONE_SUBDIV];
CLAMP_MIN(param->scale_in[1], 0.0001f);
CLAMP_MIN(param->scale_out[1], 0.0001f);
const float log_scale_in_len = logf(param->scale_in[1]);
const float log_scale_out_len = logf(param->scale_out[1]);
for (int i = 0; i < param->segments; i++) {
const float fac = ((float)i) / (param->segments - 1);
segment_scales[i] = expf(interpf(log_scale_out_len, log_scale_in_len, fac));
}
/* Compute segment vertex offsets along the curve length. */
float bezt_points[MAX_BBONE_SUBDIV + 1];
equalize_cubic_bezier(bezt_controls, MAX_BBONE_SUBDIV, param->segments, bezt_points);
equalize_cubic_bezier(
bezt_controls, MAX_BBONE_SUBDIV, param->segments, segment_scales, bezt_points);
/* Deformation uses N+1 matrices computed at points between the segments. */
if (for_deform) {