diff options
Diffstat (limited to 'source/blender/blenkernel/intern/constraint.c')
| -rw-r--r-- | source/blender/blenkernel/intern/constraint.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c index 91bf4b8d8b2..08ac5e6acce 100644 --- a/source/blender/blenkernel/intern/constraint.c +++ b/source/blender/blenkernel/intern/constraint.c @@ -1859,6 +1859,64 @@ static bConstraintTypeInfo CTI_TRANSLIKE = { 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 @@ static void constraints_init_typeinfo () { 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 |