diff --git a/meshroom/multiview.py b/meshroom/multiview.py
index a24566c0..d8b5ee18 100644
--- a/meshroom/multiview.py
+++ b/meshroom/multiview.py
@@ -6,9 +6,13 @@ from .core.graph import Graph
 def photogrammetryPipeline(inputFolder='', inputImages=[], inputViewpoints=[]):
     # type: () -> Graph
     graph = Graph('pipeline')
-    cameraInit = graph.addNewNode('CameraInit', imageDirectory=inputFolder)
-    cameraInit.viewpoints.value = [{'image': image, 'focal': -1} for image in inputImages]
-    cameraInit.viewpoints.extend(inputViewpoints)
+    cameraInit = graph.addNewNode('CameraInit')
+    if inputFolder:
+        cameraInit.imageDirectory.value = inputFolder
+    if inputImages:
+        cameraInit.viewpoints.value = [{'image': image, 'focal': -1} for image in inputImages]
+    if inputViewpoints:
+        cameraInit.viewpoints.extend(inputViewpoints)
     featureExtraction = graph.addNewNode('FeatureExtraction',
                                          input=cameraInit.outputSfm)
     imageMatching = graph.addNewNode('ImageMatching',