thanulee Posted August 9, 2013 Share Posted August 9, 2013 Hi, i was wondering how to achieve this http://jeffpatton.net/2012/09/mixing-render-engine-features/ This is raw rendering with vray lens effects. If u notice on the horizon line the color is very orange-yellow and gradually goes to overexposed white. Its like the HDRI has alot of contrast without getting overexposed at the bottom.. Or even on top left is kinda blue and not over exposed! I did some tests with Peter Gunthrie's hdri maps which are the best i ve used so far but still i cant even near achieve this result. Is there anyway to control contrast on HDRI without over exposing it? thank u Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Are you using vray or iray? I am not familiar with iray that's why I'm asking. Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 If you are using vray I guess you can load the hdri in the VrayHDRI map and adjust the contrast by changing the gamma value. Do not confuse this with the regular gamma setting. And therefore adjust color mapping settings so it won't get over expodes. You can also change the hdri image manually in Photoshop. Maybe you already knew all this, it would be kinda interesting to here what you already tried so we don't give you old news. Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Heya, yes im using vray. Well the gamma option gives me higher constrast, but it overexposes the image greatly. I mean even with gamma 1.0 and not even less (less gives contrast) the image is overexposed already at the edges. His image is overexposed only at the sun place. Ya i tried that, with exponential color mapping and didnt work either. I have no idea how he gets that result Check this pic also: The highlights on the pavement is a very nice burn yellow. This is the overall hue tha jeff patton has on the first picture i posted on its bottom side! I didnt try mess up with the hdri at photoshop.. maybe i would do that? thanx Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Another though maybe (i lack photography knowledge) has to do with how vray camera is set. I mean maybe film iso lower values compensated by shutterspeed or fstop? I m not really sure though i need get more tests going i ll post results. Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Try ticking sub-pixel mapping as well as clamp ouput (in color mapping) and play around with its values. That will prevent the pixels from going beyond the 255 255 255 value. Keep in mind that the pavement in the second picture is NOT in 3D. Only the car. Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 lol, yea u are right about the pavement, i just woke up! Well clamp output doesnt affect hdri almost at all... check these renders out. Doesnt seem to work. I cant control contrast without affecting overall lighting and reducing the huge hotspot. Which is most likely physically correct right? I cant even get near to getting that nice burn yellow! Any other suggestions? thanks man! ps. imagine that i want even lower gamma to achieve proper lighting -> thus huge hotspot! Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Ok, I know you tried experimenting with exponential, but did your experiment with the bright value? Try Reinhard and lower the burn value to 0,25 or something similar. Depening on which version of vray you use you can increase the output omount in the VrayHDRI map. Default value is 1.0, maybe you can try 1.5 He uses the Vray Lens effect. Turn on bloom and glare. In this case I also think you must turn on DoF and Bokeh in your physical camera settings, as well as specify focus and focus distance. And ofcourse if you need to lower the f-number to get that DoF you're looking for. When lowering the f-number you need to adjust the ISO and/or shutter speed to balance the exposure. For final contrast control adjust the curves in vray frame buffer. Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Ofc i did.. color mapping affects the hdri from not at all to none... Ya i know what he did exactly, i just dont know how to control the hdri Does this works on u? Color mapping controlling the hdri hotspot? Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 I don't know. Is there something similiar to this you would like to achieve? Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 yea! what are ur settings? it is kinda similar!! Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Let's see. Color mapping Type: Reinhard Burn value: 0,15 Gamma: 2,2. Only affect background is ticked. VrayHDRI Multiplier: 1 Gamma: 0,8 Output - Output Amount 1.5 Camera F-number: 3 Specify focus is on Focus distance: aprox 2 meters White balance: Neutral Shutter speed: 3000 ISO 100 Bokeh effect is on with 8 blades DoF is on. Environment and effects Vray Lens effect Bloom and glare, play around with the values you prefer. Vray frame buffer has a color curve correction which enhances the contrast. My vraylight dome has a multiplier of 1. I guess thats all. Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 And yea, I use Guthries HDRI Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Bahh... it might be the specific hdri. Gives me same result, that compensation of f stop and shutterspeed. Can u tell me which hdri is it and what horizontal value? thanks alot man u been very helpful! Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Ahh ok. Different HDRI need different values I guess. I used 0839 Cloudy Dawn at -63 horiz rotation. Wich one are you using? Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 I m using 1808 blue sky white clouds / 309 horizontal. If u can test mine too to see if all that works ! thanks! Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Just changed the HDRI file. It may not be perfect but it only took me a minute or two to setup. From here on it's just to keep playing with the values to get the perfect result. Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Yup we get similar results! already the color bleed in the hdri u used is quite orange yellow! So i guess its the HDRI choice! Thank u very much i appreciate ur time to help me! Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Just to be very clear.... are you sure Don't affect colors are unticked? Ok, just saw your post, nevermind! Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 using max 2014 so i got "none (dont apply anything)" Link to comment Share on other sites More sharing options...
thanulee Posted August 10, 2013 Author Share Posted August 10, 2013 Actually can u send me ur file somehow? i m starting to think that max 14 has something wrong xD I get overexposure still with ur settings...I just wanna render urs as it is to see if images match.. I hate 3d studio when acts like this for real :/ Link to comment Share on other sites More sharing options...
christofferthulin Posted August 10, 2013 Share Posted August 10, 2013 Sure I can email you the file Link to comment Share on other sites More sharing options...
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