TomA Posted March 5, 2008 Share Posted March 5, 2008 I'm reasonably experienced in max, but pretty inexperienced in vray. I'm creating this model, showing 3 progressive views: http://i260.photobucket.com/albums/ii31/puttyface_101/public%20spaces%20help/test2-1.jpg http://i260.photobucket.com/albums/ii31/puttyface_101/public%20spaces%20help/test4-1.jpg http://i260.photobucket.com/albums/ii31/puttyface_101/public%20spaces%20help/groundfloorwidecameraviewnew-1.jpg As the model develops and i add in surrounding buildings/walls/ceiling etc. the middle atrium spine space is becoming darker and darker. How can i achieve a similar level of lighting when the space is naturally getting more introverted and darker? I've got a vary sun set at intensity and size 0.01, and a vray light (plane) with a multipler of 2.5 positioned in the middle of the central spine space. I've got a Vraysky GI environment map with multiplier 8.0 I've also got indirect illumination turned on with irradiance map for primary bounces and light cache for secondary, both 1.0 multipliers. Link to comment Share on other sites More sharing options...
TomA Posted March 5, 2008 Author Share Posted March 5, 2008 ahhhh, i seem to have made a v stupid mistake... the vray light plane only had 1 dimension, so it was a line not a plane... i seem to be getting somewhere anyway... http://i260.photobucket.com/albums/ii31/puttyface_101/public%20spaces%20help/groundwidecameraviewnew.jpg by the way how many vray lights (type/location etc.) would you normally use in a scene like this? much appreciated! Link to comment Share on other sites More sharing options...
landrvr1 Posted March 5, 2008 Share Posted March 5, 2008 Shaping up to be a nice scene. The difference between the last shot in your first post, and the most recent shot, is huge. How many light planes did you add? How many VRay lights to add? How much processing power do you have? Seriously, it's looking very natural. I'd try just boosting your plane lights first and see how that goes. The stairwell is a bit dark, so you might want to add some wall washers, accent lighting..or just shine a light plane from below! Link to comment Share on other sites More sharing options...
Tommy L Posted March 5, 2008 Share Posted March 5, 2008 The best advice ive had concerning vray is 'keep the lighting simple', its a light simulator, so let it simulate the light coming from natural sources. Use exposure settings to boost dark areas, not extra light sources. Link to comment Share on other sites More sharing options...
bobsan Posted March 6, 2008 Share Posted March 6, 2008 Also try adjusting your film speed as well as your shutter speed on your Vray camera. Link to comment Share on other sites More sharing options...
Poll Posted March 7, 2008 Share Posted March 7, 2008 Well, what works for me is only use your vraysun light. Then place a vrayphysical cam (like f8 ss30 and iso aprox 400) Enable vray frame buffer, then render, right-click on the area you want to be white (probably your colums on the left) and look for the floating color index (probably around 1.0000) If your scene is too dark then the given index should be below 1 (like 0.6777) Remember this number and divide your ISO by this one (400/0.6777) Now you should have a direct sunlight coming in at full strenght, and your cam. properties in the right settings. Change your Gamma to 2.2 to brighten up the dark spots (in the vray settings and frame buffer) render again, and look where you need some light tweeking (maybe a vrayplane light behind the cam to simulate a flash light). well.. and I can recommend reading about LWF (linear workflow) Keep us posted! Link to comment Share on other sites More sharing options...
seig Posted March 8, 2008 Share Posted March 8, 2008 hey .. u can even try this: take a vray light(spherical) take it away from the building and check the 'no decay' option in vray light properties...and i hope u already have color mapping to 'exponential' in vray render settings. also u can put a direct light to an angle towards building , so as to get the sunlight and shadows..But when trying all this u wont be needing 'vray sun'light. see if this helps. Link to comment Share on other sites More sharing options...
TomA Posted March 13, 2008 Author Share Posted March 13, 2008 Hi, Thanks for all your responses... I'm just coming back to this one after a few days on other work. Poll, great advice but i kinda lost you after you said: 'Remember this number and divide your ISO by this one (400/0.6777)' What do you do when you get the divided number i.e. 590.2316... in this case? Also, if you (or anyone) could explain a little more about the Frame Buffer that would be a big help! Cheers P Link to comment Share on other sites More sharing options...
Poll Posted March 14, 2008 Share Posted March 14, 2008 Hi! Yes, 590 would be it because that means that you multiply your light sensitivity in a way that the area you pointed out is gonna be white. This way you have a proper bright area (no overburn(unless you want overburn somewhere)). The frame buffer supports this way, because it can provide you with floating color information (right mouse click anywhere in the V-ray frame buffer) other than that, you can apply a gamma correction (display in srgb), or exposure correction. In the upper left corner you can switch between the rendered image and Alpha (and many more if enabled, diffuse, reflection, Z-depth) used for Post processing. But most of all, it is usefull for information about the color and intensity levels. Good luck! Cheers,! P Link to comment Share on other sites More sharing options...
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