[Bf-blender-cvs] [f3b94a5] master: Alembic: add support to interpolate transform matrices in-between frames.
Kévin Dietrich
noreply at git.blender.org
Tue Sep 20 14:18:57 CEST 2016
Commit: f3b94a54bc9dc2c93c350e67f4cf1bb048d32afa
Author: Kévin Dietrich
Date: Tue Sep 20 14:15:02 2016 +0200
Branches: master
https://developer.blender.org/rBf3b94a54bc9dc2c93c350e67f4cf1bb048d32afa
Alembic: add support to interpolate transform matrices in-between
frames.
===================================================================
M source/blender/alembic/intern/abc_mesh.cc
M source/blender/alembic/intern/abc_object.cc
M source/blender/alembic/intern/abc_object.h
M source/blender/alembic/intern/abc_util.cc
M source/blender/alembic/intern/abc_util.h
M source/blender/alembic/intern/alembic_capi.cc
===================================================================
diff --git a/source/blender/alembic/intern/abc_mesh.cc b/source/blender/alembic/intern/abc_mesh.cc
index 18b5dd9..5a60587 100644
--- a/source/blender/alembic/intern/abc_mesh.cc
+++ b/source/blender/alembic/intern/abc_mesh.cc
@@ -1104,44 +1104,20 @@ void AbcMeshReader::readFaceSetsSample(Main *bmain, Mesh *mesh, size_t poly_star
utils::assign_materials(bmain, m_object, mat_map);
}
-typedef std::pair<Alembic::AbcCoreAbstract::index_t, float> index_time_pair_t;
-
static void get_weight_and_index(CDStreamConfig &config,
Alembic::AbcCoreAbstract::TimeSamplingPtr time_sampling,
size_t samples_number)
{
- if (samples_number == 0) {
- samples_number = 1;
- }
-
- index_time_pair_t floor_index = time_sampling->getFloorIndex(config.time, samples_number);
-
- config.index = floor_index.first;
- config.ceil_index = config.index;
-
- if (fabs(config.time - floor_index.second) < 0.0001f) {
- config.weight = 0.0f;
- return;
- }
+ Alembic::AbcGeom::index_t i0, i1;
- index_time_pair_t ceil_index = time_sampling->getCeilIndex(config.time, samples_number);
-
- if (config.index == ceil_index.first) {
- config.weight = 0.0f;
- return;
- }
-
- config.ceil_index = ceil_index.first;
-
- float alpha = (config.time - floor_index.second) / (ceil_index.second - floor_index.second);
-
- /* Since we so closely match the ceiling, we'll just use it. */
- if (fabs(1.0f - alpha) < 0.0001f) {
- config.index = config.ceil_index;
- alpha = 0.0f;
- }
+ config.weight = get_weight_and_index(config.time,
+ time_sampling,
+ samples_number,
+ i0,
+ i1);
- config.weight = alpha;
+ config.index = i0;
+ config.ceil_index = i1;
}
void read_mesh_sample(ImportSettings *settings,
diff --git a/source/blender/alembic/intern/abc_object.cc b/source/blender/alembic/intern/abc_object.cc
index 5b7b85f..32468fd 100644
--- a/source/blender/alembic/intern/abc_object.cc
+++ b/source/blender/alembic/intern/abc_object.cc
@@ -153,6 +153,61 @@ Object *AbcObjectReader::object() const
return m_object;
}
+static Imath::M44d blend_matrices(const Imath::M44d &m0, const Imath::M44d &m1, const float weight)
+{
+ float mat0[4][4], mat1[4][4], ret[4][4];
+
+ /* Cannot use Imath::M44d::getValue() since this returns a pointer to
+ * doubles and interp_m4_m4m4 expects pointers to floats. So need to convert
+ * the matrices manually.
+ */
+
+ for (int i = 0; i < 4; ++i) {
+ for (int j = 0; j < 4; ++j) {
+ mat0[i][j] = m0[i][j];
+ }
+ }
+
+ for (int i = 0; i < 4; ++i) {
+ for (int j = 0; j < 4; ++j) {
+ mat1[i][j] = m1[i][j];
+ }
+ }
+
+ interp_m4_m4m4(ret, mat0, mat1, weight);
+
+ Imath::M44d m;
+
+ for (int i = 0; i < 4; ++i) {
+ for (int j = 0; j < 4; ++j) {
+ m[i][j] = ret[i][j];
+ }
+ }
+
+ return m;
+}
+
+Imath::M44d get_matrix(const IXformSchema &schema, const float time)
+{
+ Alembic::AbcGeom::index_t i0, i1;
+ Alembic::AbcGeom::XformSample s0, s1;
+
+ const float weight = get_weight_and_index(time,
+ schema.getTimeSampling(),
+ schema.getNumSamples(),
+ i0,
+ i1);
+
+ schema.get(s0, Alembic::AbcGeom::ISampleSelector(i0));
+
+ if (i0 != i1) {
+ schema.get(s1, Alembic::AbcGeom::ISampleSelector(i1));
+ return blend_matrices(s0.getMatrix(), s1.getMatrix(), weight);
+ }
+
+ return s0.getMatrix();
+}
+
void AbcObjectReader::readObjectMatrix(const float time)
{
IXform ixform;
@@ -194,11 +249,8 @@ void AbcObjectReader::readObjectMatrix(const float time)
return;
}
- Alembic::AbcGeom::ISampleSelector sample_sel(time);
- Alembic::AbcGeom::XformSample xs;
- schema.get(xs, sample_sel);
-
- create_input_transform(sample_sel, ixform, m_object, m_object->obmat, m_settings->scale, has_alembic_parent);
+ const Imath::M44d matrix = get_matrix(schema, time);
+ convert_matrix(matrix, m_object, m_object->obmat, m_settings->scale, has_alembic_parent);
invert_m4_m4(m_object->imat, m_object->obmat);
diff --git a/source/blender/alembic/intern/abc_object.h b/source/blender/alembic/intern/abc_object.h
index 2e885f2..a35faa3 100644
--- a/source/blender/alembic/intern/abc_object.h
+++ b/source/blender/alembic/intern/abc_object.h
@@ -166,4 +166,6 @@ public:
chrono_t maxTime() const;
};
+Imath::M44d get_matrix(const Alembic::AbcGeom::IXformSchema &schema, const float time);
+
#endif /* __ABC_OBJECT_H__ */
diff --git a/source/blender/alembic/intern/abc_util.cc b/source/blender/alembic/intern/abc_util.cc
index fbab0bc..60c66bc 100644
--- a/source/blender/alembic/intern/abc_util.cc
+++ b/source/blender/alembic/intern/abc_util.cc
@@ -201,16 +201,9 @@ void create_transform_matrix(float r_mat[4][4])
copy_m4_m4(r_mat, transform_mat);
}
-void create_input_transform(const Alembic::AbcGeom::ISampleSelector &sample_sel,
- const Alembic::AbcGeom::IXform &ixform, Object *ob,
- float r_mat[4][4], float scale, bool has_alembic_parent)
+void convert_matrix(const Imath::M44d &xform, Object *ob,
+ float r_mat[4][4], float scale, bool has_alembic_parent)
{
-
- const Alembic::AbcGeom::IXformSchema &ixform_schema = ixform.getSchema();
- Alembic::AbcGeom::XformSample xs;
- ixform_schema.get(xs, sample_sel);
- const Imath::M44d &xform = xs.getMatrix();
-
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
r_mat[i][j] = xform[i][j];
@@ -435,3 +428,37 @@ bool has_property(const Alembic::Abc::ICompoundProperty &prop, const std::string
return prop.getPropertyHeader(name) != NULL;
}
+
+typedef std::pair<Alembic::AbcCoreAbstract::index_t, float> index_time_pair_t;
+
+float get_weight_and_index(float time,
+ const Alembic::AbcCoreAbstract::TimeSamplingPtr &time_sampling,
+ int samples_number,
+ Alembic::AbcGeom::index_t &i0,
+ Alembic::AbcGeom::index_t &i1)
+{
+ samples_number = std::max(samples_number, 1);
+
+ index_time_pair_t t0 = time_sampling->getFloorIndex(time, samples_number);
+ i0 = i1 = t0.first;
+
+ if (samples_number == 1 || (fabs(time - t0.second) < 0.0001f)) {
+ return 0.0f;
+ }
+
+ index_time_pair_t t1 = time_sampling->getCeilIndex(time, samples_number);
+ i1 = t1.first;
+
+ if (i0 == i1) {
+ return 0.0f;
+ }
+
+ const float bias = (time - t0.second) / (t1.second - t0.second);
+
+ if (fabs(1.0f - bias) < 0.0001f) {
+ i0 = i1;
+ return 0.0f;
+ }
+
+ return bias;
+}
diff --git a/source/blender/alembic/intern/abc_util.h b/source/blender/alembic/intern/abc_util.h
index 648570f..9e9f0c3 100644
--- a/source/blender/alembic/intern/abc_util.h
+++ b/source/blender/alembic/intern/abc_util.h
@@ -59,9 +59,8 @@ bool begins_with(const TContainer &input, const TContainer &match)
&& std::equal(match.begin(), match.end(), input.begin());
}
-void create_input_transform(const Alembic::AbcGeom::ISampleSelector &sample_sel,
- const Alembic::AbcGeom::IXform &ixform, Object *ob,
- float r_mat[4][4], float scale, bool has_alembic_parent = false);
+void convert_matrix(const Imath::M44d &xform, Object *ob,
+ float r_mat[4][4], float scale, bool has_alembic_parent = false);
template <typename Schema>
void get_min_max_time_ex(const Schema &schema, chrono_t &min, chrono_t &max)
@@ -95,6 +94,12 @@ void get_min_max_time(const Alembic::AbcGeom::IObject &object, const Schema &sch
bool has_property(const Alembic::Abc::ICompoundProperty &prop, const std::string &name);
+float get_weight_and_index(float time,
+ const Alembic::AbcCoreAbstract::TimeSamplingPtr &time_sampling,
+ int samples_number,
+ Alembic::AbcGeom::index_t &i0,
+ Alembic::AbcGeom::index_t &i1);
+
/* ************************** */
/* TODO(kevin): for now keeping these transformations hardcoded to make sure
diff --git a/source/blender/alembic/intern/alembic_capi.cc b/source/blender/alembic/intern/alembic_capi.cc
index 3cc5493..c698835 100644
--- a/source/blender/alembic/intern/alembic_capi.cc
+++ b/source/blender/alembic/intern/alembic_capi.cc
@@ -799,9 +799,8 @@ void ABC_get_transform(AbcArchiveHandle *handle, Object *ob, const char *object_
return;
}
- ISampleSelector sample_sel(time);
-
- create_input_transform(sample_sel, ixform, ob, r_mat, scale);
+ const Imath::M44d matrix = get_matrix(schema, time);
+ convert_matrix(matrix, ob, r_mat, scale);
}
/* ***************************************** */
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