diff --git a/solveode.py b/solveode.py
index 9b2d9b9..3e23089 100644
--- a/solveode.py
+++ b/solveode.py
@@ -98,7 +98,7 @@ def multicore_list(sc,options ={}): # sc is a dict with indices
 
     #random.shuffle(sci) #shuffling here is not really necessary. Just adds complexity
 
-    l4 = len(sci)/4
+    l4 = len(sci)//4
     chunks = [
             sci[0:l4],
             sci[l4:2*l4],
@@ -183,7 +183,7 @@ def deflection_array(r,angles,options = {}):
     thetas = np.arange(0.01,np.pi,0.01)
     deff = deflection_array(10.0,thetas,{'maxangle':2*np.pi})
     for i in range(len(deff)):
-        print deff[i][0], (deff[i][0] - (np.pi -  deff[i][1] ))
+        print(deff[i][0], (deff[i][0] - (np.pi -  deff[i][1] )))
     exit()
 
 
@@ -200,10 +200,10 @@ def deflection_array(r,angles,options = {}):
     #inc = [ [b*1000,-b*(1000**2)] for b in bs ]
     inc = { d : [10.,d] for d in dirs }
 
-    print "SOLVING"
+    print("SOLVING")
     trajs = multicore_list(inc,{'maxangle':2*6.28})
 
-    print "SAVING"
+    print("SAVING")
     for d in dirs:
         f = open('curves/infall%f'%d,'w')
         (l,u) = trajs[d]
@@ -227,7 +227,7 @@ def deflection_array(r,angles,options = {}):
 
 
     for d in dirs:
-        print d
+        print(d)
 
         f = open('curves/vel%f'%d,'w')
 
diff --git a/tracer.py b/tracer.py
index 932f0b4..fe1861e 100644
--- a/tracer.py
+++ b/tracer.py
@@ -27,13 +27,13 @@
 DARK_GREEN = np.array([0.,.2,0.])
 ZERO = np.array([0,0,0])
 
-print "loading bg.png..."
-img_bg = mpimg.imread('bg.png')
+print("loading ha1024.jpg...")
+img_bg = mpimg.imread('tex/ha1024.jpg')
 
 def get_bg_uv(u,v):
     try:
         return img_bg[int(v*2048),int(u*4096),:]
-    except ValueError,IndexError:
+    except ValueError and IndexError:
         return MAGENTA
 
 def normalize(x):
@@ -95,7 +95,7 @@ def bigPhi(theta):
 origin = np.array([0,0,0])
 
 
-print "raytracing."
+print("raytracing.")
 
 
 # an array of (x,y) pixel coordinates is shuffled. We want to process pixel uniformly,
@@ -123,7 +123,7 @@ def bigPhi(theta):
 #
 #
 #if (checkcnt != totpix):
-#    print "WTF",checkcnt,totpix
+#    print("WTF",checkcnt,totpix)
 #    exit()
 #
 donecheck = {}
@@ -134,7 +134,7 @@ def bigPhi(theta):
 #for c in chunklist:
 #    ccounter += 1
 #    
-#    print (100*ccounter)/NRCHNKS, "%"   #print progress and refresh display
+#    print((100*ccounter)/NRCHNKS, "%")   #print progress and refresh display
 #    plt.imshow(img)                         #between every chunk.
 #    plt.draw()
 #
@@ -146,7 +146,7 @@ def bigPhi(theta):
 #    rays = {}
 
 
-print "creating rays"
+print("creating rays")
 
 #compute rays
 xfscales = np.linspace(-.5,.5,w)
@@ -164,14 +164,14 @@ def bigPhi(theta):
 
 #normalizing
 
-print "normalizing rays"
+print("normalizing rays")
 
 invnorms = 1/np.sqrt( np.einsum('ijk,ijk->ij',rays,rays))
 
 rays = np.einsum('ijk,ij->ijk',rays,invnorms)
 
 
-print "computing view angles"
+print("computing view angles")
 
 normcampos = normalize(CAMPOS)
 
@@ -179,7 +179,7 @@ def bigPhi(theta):
 
 thetarr = np.arccos(mindots)
 
-print "interpolating deflection angles"
+print("interpolating deflection angles")
 
 bigPhiArr = np.zeros((w,h))
 
@@ -187,13 +187,13 @@ def bigPhi(theta):
     bigPhiArr[x,y] = bigPhi(thetarr[x,y])
 
 
-print "starting rendering..."
+print("starting rendering...")
 
 pixcount = 0
 
 for pixel in pixlist:
         if (pixcount % 400 == 0):
-            print (100*pixcount)/len(pixlist) , "%"
+            print((100*pixcount)/len(pixlist) , "%")
             img = np.clip(img,0.0,1.0)
             plt.imshow(img)
             plt.draw()
@@ -247,10 +247,10 @@ def bigPhi(theta):
 
      
         if donecheck[(x,y)] == 0:
-            print "ERROR: untraced ray in postprocessing"
+            print("ERROR: untraced ray in postprocessing")
             exit()
         if donecheck[(x,y)] == 2:
-            print "ERROR: reprocessing pixel"
+            print("ERROR: reprocessing pixel")
             exit()
 
         yp = h-y-1