raytracing

[jscarr]

Final Render materials have a checkbox for reflection blur.

Else you're going to have to use the Falloff End Distance under Raytrace Controls. Unfortunately it isn't quite as nice.

Be sure to use Supersampling, too.

[holosynthetic]

i read somewhere that if you use a noise bump map, and make the value pretty low, but have one of the UV's tiling turned up it will blur in the direction that has the most tilings..so if you tile it 100 time on the Y axis then i'm sure it will blur the image on the Y axis...

i just read this somewhere so it might not work..i never tryed it

[Jed]

Go to the raytracing options in the rendering menu and check antialiasing on.
Now in your material click on the button that has 3 little dots next to the antialising options. This will bring another rollout with options for blurry reflections. Tweak the defocusing to get the effect you need.

[Marcel]

Blurring raytraced reflections with the standard Max renderer takes a very long time and will produce average results at best. You'll get all sorts of weird stuff happening when you try a big blur.

A much better solution is rendering a cubic reflection map to file, touch it up in Photoshop and blur it with the blur parameter in the material editor.
It's not good for an animation (the reflection map is static) and it does not have good self reflections, but for most situations it'll work perfectly. As an added bonus it renders much faster too.

When you render the cubic reflection map, hide the object and use a dummy for picking the location, else the object will obscure the view in the reflection map.

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