Wonky Bokeh

StarsS

After I posted my two latest bigger projects, Maison de Verre and Salle Labrouste, a few people asked how I obtained my DOF, and in particular the strangely shaped bokehs that came with it. The answer: custom aperture maps.

Custom apertures are not specific to CG. Photographers have played with stencils attached to their lenses for decades. Here is one I did last Christmas with a simple piece of perforated cardboard:

StarsS2

The same principle applies in V-Ray. In fact, it is a lot simpler to do it that way than in post. But to start with the basics, here is a rather boring render done with V-Ray’s default DOF settings (models from lincoln3dscans.co.uk)

Boring

We can do much better than that. And for a start, we don’t even need custom aperture maps. Just turn on the “bokeh” option in the V-Ray Physical Camera settings and play with the various options. Below are the settings I used for the following image:

BokehControls2

Custom

That’s a lot more interesting. Not only can you define the shape of your aperture with a great deal of control, but you can also replicate the curvature of the lens, which warps the bokehs into a circular pattern across the image. You can see exactly what I mean in the following image. The key value here is an optical vignetting of -2.1 (which may be too much for a production image):

TestCustom

But for real, serious fun, turn on the “bitmap aperture” option and load a custom aperture map (the other options remain accessible except the “rotation” option). Note that if you do not untick the “affect exposure” option, maps that have a smaller aperture will make your bokehs smaller and your image render darker.

BokehControlsTestCustom2

Here are a few examples of images done with custom maps, followed by the respective maps (note how the motif gets inverted when the blurred object is before the point of focus). Feel free to grab them and abuse them and let me know what you come up with. Better still, do your own and show me what you come up with.

DirtyD (1)

DirtyD2

DirtyD3 (1)

DirtyD3

DirtyD4 (1)

DirtyD4

Anamo (1)

Anamo

Anamo2 (1)

Anamo2

Hearts

Heart

Stars

Star

BBBs

BBB

 

  1. Thank you so much for this tutorial bertrand !! this is proven very useful

  2. Hi, Bertrand. I like the statue material and I have tried to replicate it: http://dl.dropboxusercontent.com/s/eo8vc0kfu9j9tlt/TennysonBust.jpg
    It’s not really similar to your mat. Now I see that in my material lacks glossy reflections of the sky. And there is some differences that I can’t notice.
    It would be great if you make a tutorial for that too.

  3. Hi Artic. It looks pretty good to me! In my mat (a blend mat) I added a layer with a sharp reflection at grazing angle. You might want to try that for a glossy finish.

    • lcf
    • July 9, 2014

    Hi, Bertrand! Good tutorial! But i can’t find half settings in Bokeh effect ( maybe you use Vray 3.0 ?

    • lcf
    • July 9, 2014

    Good tutorial! But i can’t find half settings in Bokeh effect ( maybe you use Vray 3.0 ?

  4. Am not sure if it was not in previous versions as I do use V3. It’s in the camera’s setting (V-Ray Physical Cam)

    • lcf
    • July 9, 2014

    Vray 2.40 Doesn’t have ( too bad

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