Alembic: add option to triangulate meshes upon export.

6 files changed, 36 insertions, 1 deletions

diff --git a/source/blender/alembic/ABC_alembic.h b/source/blender/alembic/ABC_alembic.h
index cf121f8488c..e62713f57f5 100644
--- a/source/blender/alembic/ABC_alembic.h
+++ b/source/blender/alembic/ABC_alembic.h
@@ -64,8 +64,12 @@ struct AlembicExportParams {
 	unsigned int face_sets : 1;
 	unsigned int use_subdiv_schema : 1;
 	unsigned int packuv : 1;
+	unsigned int triangulate : 1;
 
 	unsigned int compression_type : 1;
+
+	int quad_method;
+	int ngon_method;
 	float global_scale;
 };
 
diff --git a/source/blender/alembic/CMakeLists.txt b/source/blender/alembic/CMakeLists.txt
index 6556354b016..ad85f79ef2e 100644
--- a/source/blender/alembic/CMakeLists.txt
+++ b/source/blender/alembic/CMakeLists.txt
@@ -28,6 +28,7 @@ set(INC
 	../blenkernel
 	../blenlib
 	../blenloader
+	../bmesh
 	../editors/include
 	../makesdna
 	../makesrna
diff --git a/source/blender/alembic/intern/abc_exporter.cc b/source/blender/alembic/intern/abc_exporter.cc
index bf1771278a8..50949624db2 100644
--- a/source/blender/alembic/intern/abc_exporter.cc
+++ b/source/blender/alembic/intern/abc_exporter.cc
@@ -88,6 +88,9 @@ ExportSettings::ExportSettings()
     , export_ogawa(true)
     , pack_uv(false)
     , do_convert_axis(false)
+    , triangulate(false)
+    , quad_method(0)
+    , ngon_method(0)
 {}
 
 static bool object_is_smoke_sim(Object *ob)
diff --git a/source/blender/alembic/intern/abc_exporter.h b/source/blender/alembic/intern/abc_exporter.h
index 070eb9ea81a..b99eb09c788 100644
--- a/source/blender/alembic/intern/abc_exporter.h
+++ b/source/blender/alembic/intern/abc_exporter.h
@@ -65,6 +65,10 @@ struct ExportSettings {
 	bool export_child_hairs;
 	bool export_ogawa;
 	bool pack_uv;
+	bool triangulate;
+
+	int quad_method;
+	int ngon_method;
 
 	bool do_convert_axis;
 	float convert_matrix[3][3];
diff --git a/source/blender/alembic/intern/abc_mesh.cc b/source/blender/alembic/intern/abc_mesh.cc
index b80b7c0c4c8..70af6af0827 100644
--- a/source/blender/alembic/intern/abc_mesh.cc
+++ b/source/blender/alembic/intern/abc_mesh.cc
@@ -37,8 +37,8 @@ extern "C" {
 #include "BLI_math_geom.h"
 #include "BLI_string.h"
 
+#include "BKE_cdderivedmesh.h"
 #include "BKE_depsgraph.h"
-#include "BKE_DerivedMesh.h"
 #include "BKE_main.h"
 #include "BKE_material.h"
 #include "BKE_mesh.h"
@@ -49,6 +49,9 @@ extern "C" {
 #include "WM_types.h"
 
 #include "ED_mesh.h"
+
+#include "bmesh.h"
+#include "bmesh_tools.h"
 }
 
 using Alembic::Abc::FloatArraySample;
@@ -538,6 +541,23 @@ DerivedMesh *AbcMeshWriter::getFinalMesh()
 		m_subsurf_mod->mode &= ~eModifierMode_DisableTemporary;
 	}
 
+	if (m_settings.triangulate) {
+		const bool tag_only = false;
+		const int quad_method = m_settings.quad_method;
+		const int ngon_method = m_settings.ngon_method;
+
+		BMesh *bm = DM_to_bmesh(dm, true);
+
+		BM_mesh_triangulate(bm, quad_method, ngon_method, tag_only, NULL, NULL, NULL);
+
+		DerivedMesh *result = CDDM_from_bmesh(bm, false);
+		BM_mesh_free(bm);
+
+		freeMesh(dm);
+
+		dm = result;
+	}
+
 	m_custom_data_config.pack_uvs = m_settings.pack_uv;
 	m_custom_data_config.mpoly = dm->getPolyArray(dm);
 	m_custom_data_config.mloop = dm->getLoopArray(dm);
diff --git a/source/blender/alembic/intern/alembic_capi.cc b/source/blender/alembic/intern/alembic_capi.cc
index d332b4b98bc..04ea8e82f52 100644
--- a/source/blender/alembic/intern/alembic_capi.cc
+++ b/source/blender/alembic/intern/alembic_capi.cc
@@ -351,6 +351,9 @@ void ABC_export(
 	job->settings.export_ogawa = (params->compression_type == ABC_ARCHIVE_OGAWA);
 	job->settings.pack_uv = params->packuv;
 	job->settings.global_scale = params->global_scale;
+	job->settings.triangulate = params->triangulate;
+	job->settings.quad_method = params->quad_method;
+	job->settings.ngon_method = params->ngon_method;
 
 	if (job->settings.frame_start > job->settings.frame_end) {
 		std::swap(job->settings.frame_start, job->settings.frame_end);