Modifiers: use Mesh instead of DerivedMesh for explode.

Differential Revision: https://developer.blender.org/D3718

1 files changed, 62 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/mesh_validate.c b/source/blender/blenkernel/intern/mesh_validate.c
index d5a19d19764..bfb3b107084 100644
--- a/source/blender/blenkernel/intern/mesh_validate.c
+++ b/source/blender/blenkernel/intern/mesh_validate.c
@@ -1501,4 +1501,66 @@ void BKE_mesh_calc_edges(Mesh *mesh, bool update, const bool select)
 
 	BLI_edgehash_free(eh, NULL);
 }
+
+/**
+ * Calculate/create edges from tessface data
+ *
+ * \param mesh  The mesh to add edges into
+ */
+
+void BKE_mesh_calc_edges_tessface(Mesh *mesh)
+{
+	CustomData edgeData;
+	EdgeSetIterator *ehi;
+	MFace *mf = mesh->mface;
+	MEdge *med;
+	EdgeSet *eh;
+	int i, *index, numEdges, numFaces = mesh->totface;
+
+	eh = BLI_edgeset_new_ex(__func__, BLI_EDGEHASH_SIZE_GUESS_FROM_POLYS(numFaces));
+
+	for (i = 0; i < numFaces; i++, mf++) {
+		BLI_edgeset_add(eh, mf->v1, mf->v2);
+		BLI_edgeset_add(eh, mf->v2, mf->v3);
+
+		if (mf->v4) {
+			BLI_edgeset_add(eh, mf->v3, mf->v4);
+			BLI_edgeset_add(eh, mf->v4, mf->v1);
+		}
+		else {
+			BLI_edgeset_add(eh, mf->v3, mf->v1);
+		}
+	}
+
+	numEdges = BLI_edgeset_len(eh);
+
+	/* write new edges into a temporary CustomData */
+	CustomData_reset(&edgeData);
+	CustomData_add_layer(&edgeData, CD_MEDGE, CD_CALLOC, NULL, numEdges);
+	CustomData_add_layer(&edgeData, CD_ORIGINDEX, CD_CALLOC, NULL, numEdges);
+
+	med = CustomData_get_layer(&edgeData, CD_MEDGE);
+	index = CustomData_get_layer(&edgeData, CD_ORIGINDEX);
+
+	for (ehi = BLI_edgesetIterator_new(eh), i = 0;
+	     BLI_edgesetIterator_isDone(ehi) == false;
+	     BLI_edgesetIterator_step(ehi), i++, med++, index++)
+	{
+		BLI_edgesetIterator_getKey(ehi, &med->v1, &med->v2);
+
+		med->flag = ME_EDGEDRAW | ME_EDGERENDER;
+		*index = ORIGINDEX_NONE;
+	}
+	BLI_edgesetIterator_free(ehi);
+
+	/* free old CustomData and assign new one */
+	CustomData_free(&mesh->edata, mesh->totedge);
+	mesh->edata = edgeData;
+	mesh->totedge = numEdges;
+
+	mesh->medge = CustomData_get_layer(&mesh->edata, CD_MEDGE);
+
+	BLI_edgeset_free(eh);
+}
+
 /** \} */