diff --git a/scripts/addons/cam/collision.py b/scripts/addons/cam/collision.py
index d8079033..298b57c5 100644
--- a/scripts/addons/cam/collision.py
+++ b/scripts/addons/cam/collision.py
@@ -74,13 +74,14 @@ def prepareBulletCollision(o):
 			bpy.ops.object.convert(target='MESH', keep_original=False)
 
 		collisionob=bpy.context.active_object
-		bpy.ops.rigidbody.object_add(type='ACTIVE')
+		bpy.ops.rigidbody.object_add(type='ACTIVE')#using active instead of passive because of performance.TODO: check if this works also with 4axis...
 		collisionob.rigid_body.collision_shape = 'MESH'
+		collisionob.rigid_body.kinematic=True#268 and 70 
 		collisionob.rigid_body.collision_margin = o.skin*BULLET_SCALE
 		bpy.ops.transform.resize(value=(BULLET_SCALE, BULLET_SCALE, BULLET_SCALE), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED', proportional_edit_falloff='SMOOTH', proportional_size=1, snap=False, snap_target='CLOSEST', snap_point=(0, 0, 0), snap_align=False, snap_normal=(0, 0, 0), texture_space=False, release_confirm=False)
 		collisionob.location=collisionob.location*BULLET_SCALE
 		bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
-	
+		
 	getCutterBullet(o)
 	
 	#machine objects scaling up to simulation scale
diff --git a/scripts/addons/cam/image_utils.py b/scripts/addons/cam/image_utils.py
index 95aa9b02..798079c0 100644
--- a/scripts/addons/cam/image_utils.py
+++ b/scripts/addons/cam/image_utils.py
@@ -148,7 +148,7 @@ def numpytoimage(a,iname):
 	a=a.reshape(d)
 	a=a.repeat(4)
 	a[3::4]=1
-	#i.pixels=a
+	#i.pixels=a this was 50 percent slower...
 	i.pixels[:]=a[:]#this gives big speedup!	
 	print('\ntime '+str(time.time()-t))
 	return i