HDRI Glow

[3dri]

At Debevec's Fiat Lux (to quote one very known example), when the pendulum moves, it afects the glow that comes from the HDRI light. This overbright glow looks very natural by invading the pengulun silhuete.
You also can see this effect is some previews of new DirectX9 Games that use HDRI.
I thought this was a natural consequence of using HDRI as background, But I could'n get the glow effect with vray.

Any tips on how to simulate this?

[mc-escher]

Blur needed for Glare

I would suspect that the occlusion of the glow itself is
a consequence of DOF or blur added to the scene. (Thus spreading
the high intensity light from a window out a bit past it's original source)

I haven't tried these types of experiments with VRay, but I know that I had
to use a multisampling defocus and soft filter to blur the HDRI in Radiance
to get the effect similar to the one you're seeing in Fiat Lux.

Perhaps try adding a small amount of DOF blur to your test!

Pages 48-51 of this document have some pictures of this process:
http://www.debevec.org/IBL2001/Image...art1.pdf<br />

Escher

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[3dri]

I maneged to get similar results using Glow at Video Post. But not with vray, because it crashes with Video Post here. Any idea on why this happens?

[RErender]

I maneged to get similar results using Glow at Video Post. But not with vray, because it crashes with Video Post here. Any idea on why this happens?

Did you enable the G-Buffers?

[3dri]

No. Why should I?

[egz]

because Video post needs them

[PATER]

I'm waiting for HDRI Glows too...

I'm not a programmer but i think they should'nt be so hard to write...
A perfect workflow would be if you can specify the range of brightness in your picture - for example with exposure or color mapping. If a pixel returnes overbright a simple glow function with a certain size could be applied.

So if you have an Interior and a big and bright Vray-light outside, you turn the exposure up so that the inside is lit properly and the outside glows through your windows automaticly... Vray approches many Effects from a realistic angle combined with clever algorythms... You can see glows from overbright areas with every Camera in the real world.
I wonder why this didn't find it's way in rendering engines although you can see it in recent dx9 apps. (http://www.daionet.gr.jp/~masa/rthdribl/index.html)
You can adjust the exposure interactively in this demo and you'll get different kind of blurs and glows for videocameras and different Lenses and such... I can say it over and over again... imagine these effects realtime in Vray's own VFB...
Because it's rendering you could do even more... you could compress the scenes Lightning-Scale! (something you can't just do with a normal Camera in one shot!)

This is definately a thing on my personal Vray-Wishlist!
Oh... dreaming again...
We'll see whats next in Vray

[marina]

Have you tried this?

http://www.neilblevins.com/cg_educat...ular_bloom.htm

Regards