Fixed optional import, readme

README.md

@@ -24,6 +24,7 @@ dependencies, you'll need :
 
   - pip (to install the other dependencies) `sudo apt-get install python3-pip`
     for example
+  - PIL `sudo pip install pillow`
   - numpy `sudo pip install numpy`
   - pygame `sudo pip install pygame`
   - PyOpenGL `sudo pip install pyopengl`

d3/model/formats/obj.py

@@ -2,7 +2,6 @@ from ..basemodel import ModelParser, Exporter, Vertex, TexCoord, Normal, FaceVer
 from ..mesh import Material, MeshPart
 from functools import reduce
 import os.path
-import PIL.Image
 import sys
 
 
@@ -89,7 +88,11 @@ class MTLParser:
         elif first == 'Ks':
             self.current_mtl.Ks = Vertex().from_array(split)
         elif first == 'map_Kd':
-            self.current_mtl.map_Kd = PIL.Image.open(os.path.join(os.path.dirname(self.parent.path), split[0]))
+            try:
+                import PIL.Image
+                self.current_mtl.map_Kd = PIL.Image.open(os.path.join(os.path.dirname(self.parent.path), split[0]))
+            except:
+                pass
 
 
     def parse_file(self, path):

d3/model/mesh.py

@@ -50,13 +50,16 @@ class Material:
 
         gl.glDisable(gl.GL_TEXTURE_2D)
 
-import PIL.Image
-
 Material.DEFAULT_MATERIAL=Material('')
 Material.DEFAULT_MATERIAL.Ka = 1.0
 Material.DEFAULT_MATERIAL.Kd = 0.0
 Material.DEFAULT_MATERIAL.Ks = 0.0
-Material.DEFAULT_MATERIAL.map_Kd = PIL.Image.new("RGBA", (1,1), "white")
+
+try:
+    import PIL.Image
+    Material.DEFAULT_MATERIAL.map_Kd = PIL.Image.new("RGBA", (1,1), "white")
+except:
+    pass
 
 class MeshPart:
     def __init__(self, parent):

viewer.py

@@ -6,13 +6,13 @@ import argparse
 import os
 import math
 
-from d3.model.tools import load_model
-from d3.geometry import Vector
-from d3.controls import TrackBallControls, OrbitControls
-from d3.camera import Camera
-from d3.shader import DefaultShader
-
 # Test dependencies
+try:
+    import PIL
+except:
+    print('You need to install PIL', file=sys.stderr)
+    sys.exit(-1)
+
 try:
     import pygame as pg
     import pygame.locals as pgl
@@ -33,6 +33,12 @@ except:
     print('You need to install numpy', file=sys.stderr)
     sys.exit(-1)
 
+from d3.model.tools import load_model
+from d3.geometry import Vector
+from d3.controls import TrackBallControls, OrbitControls
+from d3.camera import Camera
+from d3.shader import DefaultShader
+
 WINDOW_WIDTH = 1024
 WINDOW_HEIGHT = 1024