Commit: f0361fcf54e8d15790e2bad5c7402f6af3c24083
Author: Joshua Leung
Date: Tue Jan 13 18:06:53 2015 +1300
Branches: master
https://developer.blender.org/rBf0361fcf54e8d15790e2bad5c7402f6af3c24083
Pataz-Gooseberry Request: Limits on Volume Preservation for Spline IK
This commit adds a new type of volume preservation mode to Spline IK
which makes it possible to set limits on the minimum and maximum
scaling of bone "fatness".
* The old volume preseving mode has been kept but renamed, to avoid
breaking old rigs. "Volume Presevation" uses the new method, while
"Inverse Preservation" is the old one.
* The code and settings for this new xz scale mode are directly lifted
from the improved Stretch To constraint
===================================================================
M release/scripts/startup/bl_ui/properties_constraint.py
M source/blender/blenkernel/intern/armature.c
M source/blender/makesdna/DNA_constraint_types.h
M source/blender/makesrna/intern/rna_constraint.c
===================================================================
diff --git a/release/scripts/startup/bl_ui/properties_constraint.py
b/release/scripts/startup/bl_ui/properties_constraint.py
index e6b62ca..0c5aae1 100644
--- a/release/scripts/startup/bl_ui/properties_constraint.py
+++ b/release/scripts/startup/bl_ui/properties_constraint.py
@@ -768,9 +768,27 @@ class ConstraintButtonsPanel():
col = layout.column()
col.label(text="Chain Scaling:")
col.prop(con, "use_y_stretch")
- col.prop(con, "xz_scale_mode")
col.prop(con, "use_curve_radius")
+ layout.prop(con, "xz_scale_mode")
+
+ if con.xz_scale_mode == 'VOLUME_PRESERVE':
+ layout.prop(con, "bulge", text="Volume Variation")
+ split = layout.split()
+ col = split.column(align=True)
+ col.prop(con, "use_bulge_min", text="Volume Min")
+ sub = col.column()
+ sub.active = con.use_bulge_min
+ sub.prop(con, "bulge_min", text="")
+ col = split.column(align=True)
+ col.prop(con, "use_bulge_max", text="Volume Max")
+ sub = col.column()
+ sub.active = con.use_bulge_max
+ sub.prop(con, "bulge_max", text="")
+ col = layout.column()
+ col.active = con.use_bulge_min or con.use_bulge_max
+ col.prop(con, "bulge_smooth", text="Smooth")
+
def PIVOT(self, context, layout, con):
self.target_template(layout, con)
diff --git a/source/blender/blenkernel/intern/armature.c
b/source/blender/blenkernel/intern/armature.c
index df57db2..88b46ef 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -2166,9 +2166,9 @@ static void splineik_evaluate_bone(tSplineIK_Tree *tree,
Scene *scene, Object *o
mul_v3_fl(poseMat[2], scale);
break;
}
- case CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC:
+ case CONSTRAINT_SPLINEIK_XZS_INVERSE:
{
- /* 'volume preservation' */
+ /* old 'volume preservation' method using the
inverse scale */
float scale;
/* calculate volume preservation factor which is
@@ -2189,6 +2189,54 @@ static void splineik_evaluate_bone(tSplineIK_Tree *tree,
Scene *scene, Object *o
mul_v3_fl(poseMat[2], scale);
break;
}
+ case CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC:
+ {
+ /* improved volume preservation based on the
Stretch To constraint */
+ float scale;
+
+ /* as the basis for volume preservation, we use
the inverse scale factor... */
+ if (fabsf(scaleFac) != 0.0f) {
+ /* NOTE: The method here is taken
wholesale from the Stretch To constraint */
+ float bulge = powf(1.0f /
fabsf(scaleFac), ikData->bulge);
+
+ if (bulge > 1.0f) {
+ if (ikData->flag &
STRETCHTOCON_USE_BULGE_MAX) {
+ float bulge_max =
max_ff(ikData->bulge_max, 1.0f);
+ float hard =
min_ff(bulge, bulge_max);
+
+ float range = bulge_max
- 1.0f;
+ float scale = (range >
0.0f) ? 1.0f / range : 0.0f;
+ float soft = 1.0f +
range * atanf((bulge - 1.0f) * scale) / (0.5f * M_PI);
+
+ bulge = interpf(soft,
hard, ikData->bulge_smooth);
+ }
+ }
+ if (bulge < 1.0f) {
+ if (ikData->flag &
STRETCHTOCON_USE_BULGE_MIN) {
+ float bulge_min =
CLAMPIS(ikData->bulge_max, 0.0f, 1.0f);
+ float hard =
max_ff(bulge, bulge_min);
+
+ float range = 1.0f -
bulge_min;
+ float scale = (range >
0.0f) ? 1.0f / range : 0.0f;
+ float soft = 1.0f -
range * atanf((1.0f - bulge) * scale) / (0.5f * M_PI);
+
+ bulge = interpf(soft,
hard, ikData->bulge_smooth);
+ }
+ }
+
+ /* compute scale factor for xz axes
from this value */
+ scale = sqrt(bulge);
+ }
+ else {
+ /* no scaling, so scale factor is
simple */
+ scale = 1.0f;
+ }
+
+ /* apply the scaling (assuming normalised
scale) */
+ mul_v3_fl(poseMat[0], scale);
+ mul_v3_fl(poseMat[2], scale);
+ break;
+ }
}
/* finally, multiply the x and z scaling by the radius of the
curve too,
diff --git a/source/blender/makesdna/DNA_constraint_types.h
b/source/blender/makesdna/DNA_constraint_types.h
index fb33879..8699124 100644
--- a/source/blender/makesdna/DNA_constraint_types.h
+++ b/source/blender/makesdna/DNA_constraint_types.h
@@ -173,6 +173,12 @@ typedef struct bSplineIKConstraint {
/* settings */
short flag; /* general settings for
constraint */
short xzScaleMode; /* method used for determining the x &
z scaling of the bones */
+
+ /* volume preservation settings */
+ float bulge;
+ float bulge_min;
+ float bulge_max;
+ float bulge_smooth;
} bSplineIKConstraint;
@@ -680,15 +686,19 @@ typedef enum eKinematic_Flags {
/* bSplineIKConstraint->flag */
typedef enum eSplineIK_Flags {
/* chain has been attached to spline */
- CONSTRAINT_SPLINEIK_BOUND = (1<<0),
+ CONSTRAINT_SPLINEIK_BOUND = (1 << 0),
/* root of chain is not influenced by the constraint */
- CONSTRAINT_SPLINEIK_NO_ROOT = (1<<1),
+ CONSTRAINT_SPLINEIK_NO_ROOT = (1 << 1),
/* bones in the chain should not scale to fit the curve */
- CONSTRAINT_SPLINEIK_SCALE_LIMITED = (1<<2),
+ CONSTRAINT_SPLINEIK_SCALE_LIMITED = (1 << 2),
/* evenly distribute the bones along the path regardless of length */
- CONSTRAINT_SPLINEIK_EVENSPLITS = (1<<3),
+ CONSTRAINT_SPLINEIK_EVENSPLITS = (1 << 3),
/* don't adjust the x and z scaling of the bones by the curve radius */
- CONSTRAINT_SPLINEIK_NO_CURVERAD = (1<<4)
+ CONSTRAINT_SPLINEIK_NO_CURVERAD = (1 << 4),
+
+ /* for "volumetric" xz scale mode, limit the minimum or maximum scale
values */
+ CONSTRAINT_SPLINEIK_USE_BULGE_MIN = (1 << 5),
+ CONSTRAINT_SPLINEIK_USE_BULGE_MAX = (1 << 6),
} eSplineIK_Flags;
/* bSplineIKConstraint->xzScaleMode */
@@ -698,7 +708,9 @@ typedef enum eSplineIK_XZScaleModes {
/* bones in the chain should take their x/z scales from the original
scaling */
CONSTRAINT_SPLINEIK_XZS_ORIGINAL = 1,
/* x/z scales are the inverse of the y-scale */
- CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC = 2
+ CONSTRAINT_SPLINEIK_XZS_INVERSE = 2,
+ /* x/z scales are computed using a volume preserving technique (from
Stretch To constraint) */
+ CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC = 3
} eSplineIK_XZScaleModes;
/* MinMax (floor) flags */
diff --git a/source/blender/makesrna/intern/rna_constraint.c
b/source/blender/makesrna/intern/rna_constraint.c
index 77355db..b6845b1 100644
--- a/source/blender/makesrna/intern/rna_constraint.c
+++ b/source/blender/makesrna/intern/rna_constraint.c
@@ -1388,7 +1388,7 @@ static void rna_def_constraint_stretch_to(BlenderRNA
*brna)
prop = RNA_def_property(srna, "bulge_smooth", PROP_FLOAT, PROP_FACTOR);
RNA_def_property_range(prop, 0.0, 1.0f);
- RNA_def_property_ui_text(prop, "Volume Variation Smoothness", "");
+ RNA_def_property_ui_text(prop, "Volume Variation Smoothness", "Strength
of volume stretching clamping");
RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
}
@@ -2272,8 +2272,10 @@ static void rna_def_constraint_spline_ik(BlenderRNA
*brna)
{CONSTRAINT_SPLINEIK_XZS_NONE, "NONE", 0, "None", "Don't scale
the X and Z axes (Default)"},
{CONSTRAINT_SPLINEIK_XZS_ORIGINAL, "BONE_ORIGINAL", 0, "Bone
Original",
"Use the original scaling of
the bones"},
+ {CONSTRAINT_SPLINEIK_XZS_INVERSE, "INVERSE_PRESERVE", 0,
"Inverse Scale",
+ "Scale of the X and Z axes
is the inverse of the Y-Scale"},
{CONSTRAINT_SPLINEIK_XZS_VOLUMETRIC, "VOLUME_PRESERVE", 0,
"Volume Preservation",
- "Scale of the X and Z axes
is the inverse of the Y-Scale"},
+ "Scale of the X and Z axes
are adjusted to preserve the volume of the bones"},
{0, NULL, 0, NULL, NULL}
};
@@ -2333,12 +2335,44 @@ static void rna_def_constraint_spline_ik(BlenderRNA
*brna)
"on top of XZ Scale mode");
RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+ /* xz scaling mode */
prop = RNA_def_property(srna, "xz_scale_mode", PROP_ENUM, PROP_NONE);
RNA_def_property_enum_sdna(prop, NULL, "xzScaleMode");
RNA_def_property_enum_items(prop, splineik_xz_scale_mode);
RNA_def_property_ui_text(prop, "XZ Scale Mode",
"Method used for determining the scaling of
the X and Z axes of the bones");
RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ /* volume presevation for "volumetric" scale mode */
+ prop = RNA_def_property(srna, "bulge", PROP_FLOAT, PROP_NONE);
+ RNA_def_property_range(prop, 0.0, 100.f);
+ RNA_def_property_ui_text(prop, "Volume Variation", "Factor between
volume variation and stretching");
+ RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop = RNA_def_property(srna, "use_bulge_min", PROP_BOOLEAN, PROP_NONE);
+ RNA_def_property_boolean_sdna(prop, NULL, "flag",
CONSTRAINT_SPLINEIK_USE_BULGE_MIN);
+ RNA_def_property_ui_text(prop, "Use Volume Variation Minimum", "Use
lower limit for volume variation");
+ RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop = RNA_def_property(srna, "use_bulge_max", PROP_BOOLEAN, PROP_NONE);
+ RNA_def_property_boolean_sdna(prop, NULL, "flag",
CONSTRAINT_SPLINEIK_USE_BULGE_MAX);
+ RNA_def_property_ui_text(prop, "Use Volume Variation Maximum", "Use
upper limit for volume variation");
+ RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop = RNA_def_property(srna, "bulge_min", PROP_FLOAT, PROP_NONE);
+ RNA_def_property_range(prop, 0.0, 1.0f);
+ RNA_def_property_ui_text(prop, "Volume Variation Minimum", "Minimum
volume stretching factor");
+ RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop = RNA_def_property(srna, "bulge_max", PROP_FLOAT, PROP_NONE);
+ RNA_def_property_range(prop, 1.0, 100.0f);
+ RNA_def_property_ui_text(prop, "Volume Variation Maximum", "Maximum
volume stretching factor");
+ RNA_def_property_update(prop, NC_OBJECT | ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop = RNA_def_property(srna, "bulge_smooth", PRO
@@ Diff output truncated at 10240 characters. @@
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