Revision: 27535
http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=27535
Author: harkyman
Date: 2010-03-16 13:55:56 +0100 (Tue, 16 Mar 2010)
Log Message:
-----------
New "Maintain Volume" constraint. When attached to a bone, you specify a "free"
axis. Upon scaling, this free axis scales normally, but the constraint forces
the other two axes to adjust themselves appropriately so that overall bone
volume is maintained. So, setting "Y" as the free axis (the default) creates a
bone that automatically squashes and stretches when scaling. Thanks to
Aligorith, Fweeb, Cessen and others for the feedback.
Modified Paths:
--------------
trunk/blender/release/scripts/ui/properties_object_constraint.py
trunk/blender/source/blender/blenkernel/intern/constraint.c
trunk/blender/source/blender/makesdna/DNA_constraint_types.h
trunk/blender/source/blender/makesrna/intern/rna_constraint.c
Modified: trunk/blender/release/scripts/ui/properties_object_constraint.py
===================================================================
--- trunk/blender/release/scripts/ui/properties_object_constraint.py
2010-03-16 12:45:13 UTC (rev 27534)
+++ trunk/blender/release/scripts/ui/properties_object_constraint.py
2010-03-16 12:55:56 UTC (rev 27535)
@@ -461,6 +461,17 @@
self.space_template(layout, con, wide_ui)
+ def MAINTAIN_VOLUME(self, context, layout, con, wide_ui):
+
+ row = layout.row()
+ if wide_ui:
+ row.label(text="Free:")
+ row.prop(con, "axis", expand=True)
+
+ layout.prop(con, "volume")
+
+ self.space_template(layout, con, wide_ui)
+
def COPY_TRANSFORMS(self, context, layout, con, wide_ui):
self.target_template(layout, con, wide_ui)
Modified: trunk/blender/source/blender/blenkernel/intern/constraint.c
===================================================================
--- trunk/blender/source/blender/blenkernel/intern/constraint.c 2010-03-16
12:45:13 UTC (rev 27534)
+++ trunk/blender/source/blender/blenkernel/intern/constraint.c 2010-03-16
12:55:56 UTC (rev 27535)
@@ -1859,6 +1859,64 @@
translike_evaluate /* evaluate */
};
+/* ---------- Maintain Volume ---------- */
+
+static void samevolume_new_data (void *cdata)
+{
+ bSameVolumeConstraint *data= (bSameVolumeConstraint *)cdata;
+
+ data->flag = SAMEVOL_Y;
+ data->volume = 1.0f;
+}
+
+static void samevolume_evaluate (bConstraint *con, bConstraintOb *cob)
+{
+ bSameVolumeConstraint *data= con->data;
+
+ float obsize[3];
+ float volume=data->volume;
+
+ mat4_to_size(obsize, cob->matrix);
+
+ switch (data->flag) {
+ case SAMEVOL_X:
+ if (obsize[0]!=0) {
+ mul_v3_fl(cob->matrix[1],
sqrt(volume/obsize[0])/obsize[0]);
+ mul_v3_fl(cob->matrix[2],
sqrt(volume/obsize[0])/obsize[0]);
+ }
+ break;
+ case SAMEVOL_Y:
+ if (obsize[1]!=0) {
+ mul_v3_fl(cob->matrix[0],
sqrt(volume/obsize[1])/obsize[1]);
+ mul_v3_fl(cob->matrix[2],
sqrt(volume/obsize[1])/obsize[1]);
+ }
+ break;
+ case SAMEVOL_Z:
+ if (obsize[2]!=0) {
+ mul_v3_fl(cob->matrix[0],
sqrt(volume/obsize[2])/obsize[2]);
+ mul_v3_fl(cob->matrix[1],
sqrt(volume/obsize[2])/obsize[2]);
+ }
+ break;
+ }
+
+}
+
+static bConstraintTypeInfo CTI_SAMEVOL = {
+ CONSTRAINT_TYPE_SAMEVOL, /* type */
+ sizeof(bSameVolumeConstraint), /* size */
+ "Maintain Volume", /* name */
+ "bSameVolumeConstraint", /* struct name */
+ NULL, /* free data */
+ NULL, /* relink data */
+ NULL, /* id looper */
+ NULL, /* copy data */
+ samevolume_new_data, /* new data */
+ NULL, /* get constraint targets */
+ NULL, /* flush constraint targets */
+ NULL, /* get target matrix */
+ samevolume_evaluate /* evaluate */
+};
+
/* ----------- Python Constraint -------------- */
static void pycon_free (bConstraint *con)
@@ -3805,6 +3863,7 @@
constraintsTypeInfo[21]= &CTI_DAMPTRACK; /* Damped
TrackTo Constraint */
constraintsTypeInfo[22]= &CTI_SPLINEIK; /* Spline IK
Constraint */
constraintsTypeInfo[23]= &CTI_TRANSLIKE; /* Copy
Transforms Constraint */
+ constraintsTypeInfo[24]= &CTI_SAMEVOL; /* Maintain
Volume Constraint */
}
/* This function should be used for getting the appropriate type-info when only
Modified: trunk/blender/source/blender/makesdna/DNA_constraint_types.h
===================================================================
--- trunk/blender/source/blender/makesdna/DNA_constraint_types.h
2010-03-16 12:45:13 UTC (rev 27534)
+++ trunk/blender/source/blender/makesdna/DNA_constraint_types.h
2010-03-16 12:55:56 UTC (rev 27535)
@@ -208,6 +208,12 @@
char subtarget[32];
} bSizeLikeConstraint;
+/* Maintain Volume Constraint */
+typedef struct bSameVolumeConstraint {
+ int flag;
+ float volume;
+} bSameVolumeConstraint;
+
/* Copy Transform Constraint */
typedef struct bTransLikeConstraint {
Object *tar;
@@ -412,6 +418,7 @@
CONSTRAINT_TYPE_DAMPTRACK, /* New Tracking
constraint that minimises twisting */
CONSTRAINT_TYPE_SPLINEIK, /* Spline-IK - Align
'n' bones to a curve */
CONSTRAINT_TYPE_TRANSLIKE, /* Copy transform
matrix */
+ CONSTRAINT_TYPE_SAMEVOL, /* Maintain volume
during scaling */
/* NOTE: no constraints are allowed to be added after this */
NUM_CONSTRAINT_TYPES
@@ -499,6 +506,13 @@
SIZELIKE_OFFSET = (1<<3),
} eCopyScale_Flags;
+/* bSameVolumeConstraint.flag */
+typedef enum eSameVolume_Modes {
+ SAMEVOL_X = 0,
+ SAMEVOL_Y,
+ SAMEVOL_Z,
+} eSameVolume_Modes;
+
/* Locked-Axis Values (Locked Track) */
typedef enum eLockAxis_Modes {
LOCK_X = 0,
Modified: trunk/blender/source/blender/makesrna/intern/rna_constraint.c
===================================================================
--- trunk/blender/source/blender/makesrna/intern/rna_constraint.c
2010-03-16 12:45:13 UTC (rev 27534)
+++ trunk/blender/source/blender/makesrna/intern/rna_constraint.c
2010-03-16 12:55:56 UTC (rev 27535)
@@ -50,6 +50,7 @@
{CONSTRAINT_TYPE_LOCLIMIT, "LIMIT_LOCATION", ICON_CONSTRAINT_DATA,
"Limit Location", ""},
{CONSTRAINT_TYPE_ROTLIMIT, "LIMIT_ROTATION", ICON_CONSTRAINT_DATA,
"Limit Rotation", ""},
{CONSTRAINT_TYPE_SIZELIMIT, "LIMIT_SCALE", ICON_CONSTRAINT_DATA, "Limit
Scale", ""},
+ {CONSTRAINT_TYPE_SAMEVOL, "MAINTAIN_VOLUME", ICON_CONSTRAINT_DATA,
"Maintain Volume", ""},
{CONSTRAINT_TYPE_TRANSFORM, "TRANSFORM", ICON_CONSTRAINT_DATA,
"Transformation", ""},
{0, "", 0, "Tracking", ""},
{CONSTRAINT_TYPE_CLAMPTO, "CLAMP_TO", ICON_CONSTRAINT_DATA, "Clamp To",
""},
@@ -124,6 +125,8 @@
return &RNA_CopyLocationConstraint;
case CONSTRAINT_TYPE_SIZELIKE:
return &RNA_CopyScaleConstraint;
+ case CONSTRAINT_TYPE_SAMEVOL:
+ return &RNA_MaintainVolumeConstraint;
case CONSTRAINT_TYPE_PYTHON:
return &RNA_PythonConstraint;
case CONSTRAINT_TYPE_ACTION:
@@ -813,6 +816,34 @@
RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT,
"rna_Constraint_update");
}
+static void rna_def_constraint_same_volume(BlenderRNA *brna)
+{
+ StructRNA *srna;
+ PropertyRNA *prop;
+
+ static EnumPropertyItem volume_items[] = {
+ {SAMEVOL_X, "SAMEVOL_X", 0, "X", ""},
+ {SAMEVOL_Y, "SAMEVOL_Y", 0, "Y", ""},
+ {SAMEVOL_Z, "SAMEVOL_Z", 0, "Z", ""},
+ {0, NULL, 0, NULL, NULL}};
+
+ srna= RNA_def_struct(brna, "MaintainVolumeConstraint", "Constraint");
+ RNA_def_struct_ui_text(srna, "Maintain Volume Constraint", "Maintains a
constant volume along a single scaling axis");
+ RNA_def_struct_sdna_from(srna, "bSameVolumeConstraint", "data");
+
+ prop= RNA_def_property(srna, "axis", PROP_ENUM, PROP_NONE);
+ RNA_def_property_enum_sdna(prop, NULL, "flag");
+ RNA_def_property_enum_items(prop, volume_items);
+ RNA_def_property_ui_text(prop, "Free Axis", "The free scaling axis of
the object");
+ RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT,
"rna_Constraint_update");
+
+ prop= RNA_def_property(srna, "volume", PROP_FLOAT, PROP_DISTANCE);
+ RNA_def_property_range(prop, 0.001, 100.f);
+ RNA_def_property_ui_text(prop, "Volume", "Volume of the bone at rest");
+ RNA_def_property_update(prop, NC_OBJECT|ND_CONSTRAINT,
"rna_Constraint_update");
+
+}
+
static void rna_def_constraint_transform_like(BlenderRNA *brna)
{
StructRNA *srna;
@@ -1897,6 +1928,7 @@
rna_def_constraint_locked_track(brna);
rna_def_constraint_action(brna);
rna_def_constraint_size_like(brna);
+ rna_def_constraint_same_volume(brna);
rna_def_constraint_locate_like(brna);
rna_def_constraint_rotate_like(brna);
rna_def_constraint_transform_like(brna);
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