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Glare applied to background image


Ricardo Eloy
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After a lot of research, I finally gave up and decided to ask you guys how to do it... I remember seeing something about using Mental Ray's glare shader to add the effect to pre-rendered images. The technique consisted, as far as I can remember, of putting an existing image as BG and adding the glare shader to the renderer. Well, I did that and my result was... nothing. I was able to have objects (models, not those in the BG pic) glowing the way they should, but the effect was not affecting the background, which is my goal. Not many parameters I could change (Glare does not have much to mess with), so I really have no idea what I'm missing here. :o

Any thoughts?

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OK just tried it and it does work,

 

It comes down to exposure control, use mrPhotographic with physical scale set to unitless. I used 9000 but you can change it to suit. Change the EV to brighten the image. Be sure "Process Backround" is checked

 

Turn ON the Output Glare and drag it to the material editor to play with the values. I turn on "Replace Rendered image with Glare Only" to see the results.

 

I think it would be a good Idea to leave this on and comp it into the original render as the exposure control will change the original image.

 

jhv

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Thank you so much, Justin and Duncan!

The Exposure Control was exactly what I missed here. Being a VRay guy, I totally forgot about its existence, lol... And the 32-bit tip is a great one, and exemplifies another good reason for using EXR files (even if Composite can't read them...).

Thank you guys once again!

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Thank you so much, Justin and Duncan!

The Exposure Control was exactly what I missed here. Being a VRay guy, I totally forgot about its existence, lol... And the 32-bit tip is a great one, and exemplifies another good reason for using EXR files (even if Composite can't read them...).

Thank you guys once again!

 

Pleasure glad to help

 

jhv

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