Implement ofMesh .save() of triangle strips

openframeworks · Jun 13, 2019 · 45d7055 · 45d7055
1 parent a7564f2
commit 45d7055
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/libs/openFrameworks/3d/ofMesh.inl b/libs/openFrameworks/3d/ofMesh.inl
@@ -1310,6 +1310,9 @@ void ofMesh_<V,N,C,T>::save(const std::filesystem::path& path, bool useBinary) c
 	} else if(data.getMode() == OF_PRIMITIVE_TRIANGLES) {
 		os << "element face " << data.getNumVertices() / faceSize << std::endl;
 		os << "property list uchar int vertex_indices" << std::endl;
+	} else if(data.getMode() == OF_PRIMITIVE_TRIANGLE_STRIP && data.getNumVertices() >= 4) {
+		os << "element face " << data.getNumVertices() - 2 << std::endl;
+		os << "property list uchar int vertex_indices" << std::endl;
 	}
 
 	os << "end_header" << std::endl;
@@ -1367,6 +1370,20 @@ void ofMesh_<V,N,C,T>::save(const std::filesystem::path& path, bool useBinary) c
 				os << (std::size_t) faceSize << " " << indices[0] << " " << indices[1] << " " << indices[2] << std::endl;
 			}
 		}
+	} else if(data.getMode() == OF_PRIMITIVE_TRIANGLE_STRIP && data.getNumVertices() >= 4) {
+		for(uint32_t i = 0; i < data.getNumVertices() - 2; i += 2) {
+			uint32_t indices1[] = {i, i + 1, i + 2};
+			uint32_t indices2[] = {i + 1, i + 3, i + 2};
+			if(useBinary) {
+				os.write((char*) &faceSize, sizeof(unsigned char));
+				os.write((char*) indices1, sizeof(indices1));
+				os.write((char*) &faceSize, sizeof(unsigned char));
+				os.write((char*) indices2, sizeof(indices2));
+			} else {
+				os << (std::size_t) faceSize << " " << indices1[0] << " " << indices1[1] << " " << indices1[2] << std::endl;
+				os << (std::size_t) faceSize << " " << indices2[0] << " " << indices2[1] << " " << indices2[2] << std::endl;
+			}
+		}
 	}
 
 	//TODO: add index generation for other OF_PRIMITIVE cases