diff --git a/docs/figs/lvl7_2D.png b/docs/figs/lvl7_2D.png
new file mode 100644
index 0000000..4914ca8
Binary files /dev/null and b/docs/figs/lvl7_2D.png differ
diff --git a/docs/slides.md b/docs/slides.md
index 99134fc..cf5f4b0 100644
--- a/docs/slides.md
+++ b/docs/slides.md
@@ -20,3 +20,19 @@ title: Bureau d'étude de PI3D
 Sujet 6 - Reformulation du MVS par level sets
 
 ---
+
+## Level sets ?
+
+<img src="https://upload.wikimedia.org/wikipedia/commons/7/78/Level_set_method.png" class="m-auto -mt-7"/>
+
+---
+
+## Exemple Level sets 2D
+
+<img src="figs/lvl7_2D.png" class="m-auto h-110"/>
+
+<Footnotes separator>
+  <Footnote>
+    Variational principles, surface evolution, PDEs, level set methods, and the stereo problem - Olivier Faugeras, Renaud Keriven, 1998
+  </Footnote>
+</Footnotes>
diff --git a/src/blender/render.py b/src/blender/render.py
index 991f28b..be9babd 100644
--- a/src/blender/render.py
+++ b/src/blender/render.py
@@ -1,9 +1,10 @@
-import bpy
-import math
 import itertools
+import math
 import pathlib
 import pickle
 import sys
+
+import bpy
 import numpy as np
 
 # dirty hack to import proj.py
@@ -17,15 +18,15 @@ from proj import get_3x4_P_matrix_from_blender
 EXPORT_PATH = pathlib.Path("/tmp/")
 
 # setup camera poses
-phis = [-45, 0, 45]
-thetas = [0, 45, 90, 135, 180, 225, 270, 315]
+rotsY = range(-45, 45 + 1, 20)
+rotsZ = range(-45, 45 + 1, 20)
 
 # convert to radians
-phis = [math.radians(phi) for phi in phis]
-thetas = [math.radians(theta) for theta in thetas]
+rotsY = [math.radians(rotY) for rotY in rotsY]
+rotsZ = [math.radians(rotZ) for rotZ in rotsZ]
 
 # create all possible combinations
-poses = list(itertools.product(phis, thetas))
+poses = list(itertools.product(rotsY, rotsZ))
 
 # create export folders
 pathlib.Path(EXPORT_PATH / "images").mkdir(parents=True, exist_ok=True)
@@ -39,12 +40,12 @@ bpy.data.scenes["Scene"].node_tree.nodes["Mask Output"].base_path = str(EXPORT_P
 # get camera
 cam = bpy.data.objects["Camera"]
 
-for i, (phi, theta) in enumerate(poses):
+for i, (rotY, rotZ) in enumerate(poses):
     print(f"Rendering pose {i}...")
 
     # set camera pose
-    bpy.context.scene.objects["Empty"].rotation_euler[0] = phi
-    bpy.context.scene.objects["Empty"].rotation_euler[2] = theta
+    bpy.context.scene.objects["Empty"].rotation_euler[1] = rotY
+    bpy.context.scene.objects["Empty"].rotation_euler[2] = rotZ
 
     # fuck you blender and your stupid shit
     bpy.context.view_layer.update()