[Bf-blender-cvs] [638c16f4101] master: Armature: implement lengthwise scaling of B-Bone segments.
Alexander Gavrilov
noreply at git.blender.org
Fri Jun 18 17:56:29 CEST 2021
Commit: 638c16f41010d716a3ee47017eb0155044dd825a
Author: Alexander Gavrilov
Date: Tue Jun 15 13:09:43 2021 +0300
Branches: master
https://developer.blender.org/rB638c16f41010d716a3ee47017eb0155044dd825a
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
===================================================================
M source/blender/blenkernel/intern/armature.c
===================================================================
diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index f6b861946ec..93ad6f37233 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -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) {
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