Stan Zaslavsky Posted January 10, 2009 Share Posted January 10, 2009 hi all and a happy new year i haven't posted in a little while, now is time to get back into the swing of things so looking forward to a great year of learning and growth this one is causing a little headache - i need to get this development model into a photo with accurate orientation, lighting and the rest first image is the render and second is where the development should be placed into the render model is completed - but i just can't get the lighting to match up - i'm using mr, settings: as per photos exposure values (1/500s, f/5.6, ISO - 125). i've also set up the mr sun to be in the correct position as per when the photo was taken. any clues why the image is coming out so dark would be very helpful? thanks a bunch in advance cheers, Link to comment Share on other sites More sharing options...
Horhe Posted January 10, 2009 Share Posted January 10, 2009 First off a plane underneath the building so that light can bounce off it and illuminate the walls. Well it can be the strenght of the sun, the sky, the colour mapping values, the camera values or the material colour values. If all is set properly try and adjust the colour mapping values. I wouldnt say that it is neccesary comming out dark, more washed out. Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 10, 2009 Author Share Posted January 10, 2009 hi horhe thanks for the feedback - you're absolutely right on the 1st one - i've put the plane in and now the image is much brighter. i also agree that the image is more washed out - thats probably the function of my exposure settings in max and the gamma settings - so i'll play around with that further how do you mean colour mapping values though? Link to comment Share on other sites More sharing options...
Cocytus09 Posted January 10, 2009 Share Posted January 10, 2009 Hi Stan, You might want to add some Ambient Occlusion, and more soft shadows to your render. The original picture doesn't show any hard shadows on the surfaces, so the sun was probably blocked by a cloud. Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 11, 2009 Author Share Posted January 11, 2009 Hi Edson, thanks for your feedback - i'm using AO as its inbuilt into the Arch & Des materials shadow wise - working on that one - i took out shadows to the ground for the moment is there a way to make the model drop shadows to the ground and then in photoshop apply these shadows to the appropriate areas on the photo? Link to comment Share on other sites More sharing options...
Claudio Branch Posted January 11, 2009 Share Posted January 11, 2009 is there a way to make the model drop shadows to the ground and then in photoshop apply these shadows to the appropriate areas on the photo? Yes, just use a Matte/Shadow material. Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 12, 2009 Author Share Posted January 12, 2009 thanks Claudio - much appreciated i've put one in - but my rendering is still not quite matching up to the photo - so i think i need to get the sitework on the south side of the building in - then the lines will match up. i know we've gone through this one before in some detail - but aside from lofting a slope to get a terrain - is there a way to connect four splines together to form a terrain? Some sort of bridge command? cheers, Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 12, 2009 Author Share Posted January 12, 2009 ok now that i've got the plane in matte/shadow - how exactly can i create this into shadow on the photo? is this something to do with alpha channel? sorry if this question seems too silly? is there a tutorial somewhere on this? thanks a huge bunch Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 13, 2009 Author Share Posted January 13, 2009 well after a bit of experimenting - here is a matched up rendering i'm still not 100% on how to use alpha channel to create a shadow to map onto the existing photo - i've worked out how to bring the image as a selection into the existing photo and mask out areas to blend the image a little better. looking forward to your c&c Link to comment Share on other sites More sharing options...
pipjor Posted January 13, 2009 Share Posted January 13, 2009 (edited) that pole is distracting your cast shadows are not correct, see Edsons comment Edited January 13, 2009 by pipjor Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 13, 2009 Author Share Posted January 13, 2009 thanks for your feedback David - unf can't do much about the pole - in the final development its going to stay around i also agree with Edsons comment re hard vs soft shadows - i'll work on that one cheers, Link to comment Share on other sites More sharing options...
shaneis Posted January 13, 2009 Share Posted January 13, 2009 Hi Stan, using the pole as a reference, there are no noticeable shadows casting at all. You could just get away with using the environment or an HDRi to provide illumination and occlusion for this one, maybe with a very weak sun/ directional light. Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 13, 2009 Author Share Posted January 13, 2009 thanks shane - good feedback - i'll give this a go Link to comment Share on other sites More sharing options...
Magnus_Alexander Posted January 16, 2009 Share Posted January 16, 2009 Ugh.... I hate it when a client gives me photos like this; where there's either a tree or a utility pole right in the middle of the image!... I've been there too many times. In regards to trying to get the shadows into photoshop, I'm not so sure about MR, but I know in vray you can use the frame buffer to render the shadows in a separate pass. Maybe that shadow / matte material does the same thing? From there, you can composite the rendering, and the shadow map pass (on separate layers) and use the blend modes in photoshop to affect the layers below. I hope that makes sense.... Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 16, 2009 Author Share Posted January 16, 2009 Cool thanks - it does kind of make sense. With the frame buffer - is that a VRay term? or is that a max function? because i find that if i hide the building and just render the matte/shadow plane - it leaves some weird discolourations on it that look like shadows - but they're not quite shadows. so i wasnt sure of how to convert this to a transparent shadow effect. cheers and thanks for your feedback Link to comment Share on other sites More sharing options...
Magnus_Alexander Posted January 16, 2009 Share Posted January 16, 2009 The frame buffer is a feature within vray that allows you to render separate channels of information, such as depth, shadows, reflection, material ID's... it's unbelievably useful, and unfortunately I don't know MR well enough to say whether it has a similar function. I guess what I would do is create a separate image using the matte/shadow material that claudio mentioned, and overlaying that with the blend modes in photoshop. Like I said though; I'm not too familiar with MR, so I'm making a suggestion based on an assumption of how that matte/shadow material works Link to comment Share on other sites More sharing options...
FlytE Posted January 22, 2009 Share Posted January 22, 2009 I think you need to up the exposure a bit and brighten the thing up. I know you are probably working to correct exposures but if you look at your physical sky compared to the sky in the photo you will see its considerably darker. I suggest upping your iso on your camera. I hope you dont mind but I did a quick test in photoshop, just masking off your building and brighting it up. I also brightened up the photo in the background a tad, but that was just me playing about (i cant help myself) Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 22, 2009 Author Share Posted January 22, 2009 Hi Andy, you are absolutely right - the building was a little dark - at the moment this is the stage that we're at: i still need to put it together into the scene but the materials have changed a bit and also some modelling too Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 23, 2009 Author Share Posted January 23, 2009 well this is it at the moment - i worked on getting my shadows a lot lighter on the building to be in line with the photo the main thing i'm not too happy with - is in the alleyway the join between dirty road and our driveway is very visible - any way in photoshop to blend it better? Link to comment Share on other sites More sharing options...
WAcky Posted January 25, 2009 Share Posted January 25, 2009 hey stan this is looking really good. For the join i'd either lower that stepdown so the new property joins flush with the photo or perhaps put a small curve on that hard edge, kinda like at the end of a driveway how there is a small stepdown but its got a curve... Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted January 25, 2009 Author Share Posted January 25, 2009 cool - thanks wacky - i'll give it a go - i wonder how noticeable it will make it after that cheers Link to comment Share on other sites More sharing options...
Magnus_Alexander Posted January 28, 2009 Share Posted January 28, 2009 Also, use the clone stamp to get rid of all the nasty leaves in the street. Just be careful not to create noticeable artifacts (usually caused by using a small sample area repeatedly with the stamp) Link to comment Share on other sites More sharing options...
SandmanNinja Posted January 29, 2009 Share Posted January 29, 2009 nice montage, mate! Link to comment Share on other sites More sharing options...
Stan Zaslavsky Posted February 6, 2009 Author Share Posted February 6, 2009 thanks to all those who commented! it certainly gave me great insights how to improve the image. i decided to do a bit more of a marketing image and get rid of that pole all the best Link to comment Share on other sites More sharing options...
WAcky Posted February 6, 2009 Share Posted February 6, 2009 looks great stan! If that car wasn't such a rare model i'd swear it was part of the original picture. Shame the sky is blown out so much. A nice blue would really punch up the image. I think making your windows a little more reflective and having them reflect something would also have a positive effect. I think your shadows on the model itself are good but the shadows being cast on the photograph are way too dark. Wd Link to comment Share on other sites More sharing options...
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