Radial Blur

Support Compositing and Post Processing
1

Hello, I am not exactly sure if that is what you call it, but what I mean is a picture where the center of the pic is focused, while the areas around it seem smudged. I was wondering if this could be achieved with nodes, but I’m very new to them. Any ideas would be appreciated. Heres a pic of what I mean. One thing though, I wanted to make the center and about 20% of the center more or less sharp.
Edit: Oops I didn’t notice the sticky node thread, please excuse me.
Thanks

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2

Sounds to me like you could be referring to zoom or radial blur. Gimp has filters to add zoom and radial blur. If you make a couple of layers with the same image you could blur/zoom the bottom layer and then make a transparency mask to decide what proportion of the zoomed and unzoomed layers show through.

As for doing this in Blender, you could possibly achieve this using composite nodes with a similar method. Without actually doing it (no blender installed here), here is my proposed method.

Split the “image” node from the render output. One line goes to a radial blur node, and then into a mix node. The other goes directly to the mix node. You will need to have a black and white/greyscale image that plugs into the mix node to determine the transition/ratio of the layers.

3

Ok, I’ll try both methods, thanks.
(Edit: There is no such thing as a radial blur node…)

4

Ok, they are still on their way :slight_smile:

5

A way to pull off a radial blur using existing nodes:

In short:
Capture the vector output of simple spinning plane to a hdr file, then input that into a vector blur on what you want blurred.

More detail:

  • Make a scene with a camera looking flat at a face that’s taking up the whole frame.
  • Animate the plane spinning clockwise (or counterclockwise.)[LIST]
  • set a rotation key on frame 1
  • go to frame 3
  • rotate the plane 10 degrees.
  • set a key.
  • go to frame 2
  • In the render layers turn on “Vec” (for Vectors.)
  • Open and activate the node editor and “Do Composite”
  • Create a file output node"Add, Output, File Output"
  • Change it to OpenEXR (values over 1 are needed for the vector blur input.)
  • Connect the Vec of the scene to file output,
  • Render to create the vector EXR file.
  • Then go to your Scene where you want a radial blur:
  • Create a vector blur node
  • Connect the Image and Z of your scene to the vector blur. (a flat z value is preferred)
  • make a file input,[LIST]
  • select the file the EXR file you created earlier and connect that to the vector blur. [/LIST] [/LIST]…More or less.
    I connect the vector blur output to into another one for better results.

I’ve been working on a much more flexible node setup for doing blurs and smudges:
http://blenderartists.org/forum/showthread.php?t=90076

It doesn’t have to be a radial for example.
watch the video

Informed comments on it would be nice.
If there’s interest I’ll expand it into a proper tutorial.

I hope that works for you.

6

http://thomasart.net/files/radial_blur_nodes.png

here’s the .blend

7

I still have not received any responses to this radial bur method (above)
The point is: no new “radial blur” node is needed. this method is very flexible (video included.)
I have not seen any discussion on this.
Anyone? thanks.