Ricardo Eloy Posted May 17, 2010 Share Posted May 17, 2010 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. Any thoughts? Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 How about applying the image to a plane with screen mapping? Just a thought I havn't tried it. Personally I would rather do this in AE or even Photoshop jhv Link to comment Share on other sites More sharing options...
Ricardo Eloy Posted May 17, 2010 Author Share Posted May 17, 2010 Personally I would rather do this in AE or even Photoshop That's how I do it, but the results I saw with MRGlare looked really cool (and did not take long to render). Thought it was worth the shot. Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 (edited) Yea the glare is great, the glare itself is a post render so takes not time at all to render. How are you applying it, as an camera output shader? Edited May 17, 2010 by Justin Hunt Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 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 Link to comment Share on other sites More sharing options...
Spacelord Posted May 17, 2010 Share Posted May 17, 2010 The file you put in the background needs to be 32bit exr. Or use Thorsterns photostudio. cheers Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 not essential to be 32bit, it may produce a better result though. I used a 8 bit png jhv Link to comment Share on other sites More sharing options...
Spacelord Posted May 17, 2010 Share Posted May 17, 2010 Well to get the same results as doing it the normal way through 3dsmax your better using 32bit. Its up to you, but you may as well do it right and have more control. cheers Link to comment Share on other sites More sharing options...
Ricardo Eloy Posted May 17, 2010 Author Share Posted May 17, 2010 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! Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 Well to get the same results as doing it the normal way through 3dsmax your better using 32bit. Its up to you, but you may as well do it right and have more control. cheers True, Link to comment Share on other sites More sharing options...
Justin Hunt Posted May 17, 2010 Share Posted May 17, 2010 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 Link to comment Share on other sites More sharing options...
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