Hi Friends, I am Rhino 3D user and use Vue some times for rendering my models.I am attaching two renders of my recent models,I am unable to understand why some times the blur on the blades comes quite good but some times it looks like the blades are Disintegrating!The pic one is the good one and the another one in the cobras I am unable to give it a cool blur,hope you guyz will guide me, Thanking you in advance.

Here is the another one with bad blur!

I also have a problem with motion blur. I get excellent blur in Vue 4 and 5, but in infinite it sometimes just won't work. and then suddenly it works so well that the entire scene has motion blur if I just move the camera 1 mm.

yah it is a bit weird :( it should be based on how much the object moves over time of the animation set for it, but... shrugs Perosnally I find it better to make the blur in Paint Shop so I can be precise.

Okay the blur of the cobras is flat/side on view, your first has a 3/4 profile with some yaw( i Think)that gives it dimension...in the cobras the blades are on top of each other and the mass negates almost all colour in the blade plane (too much dark space) and remeber the blades cantor/angle to get more lift/power...R

For most instances I find the 2D blur works not only faster, but better also. If these images are part of an animation I wouldn't worry about it.