Christopher Nichols Posted April 27, 2006 Share Posted April 27, 2006 Encore question! And let's say for the case of a house ,how far from the target would you put your Vray-sunlight,how big and how intense( in feet and inches)? Thanks a lot! Now now... you don't want me to give away all of my DVD do you? Link to comment Share on other sites More sharing options...
archkre Posted April 28, 2006 Author Share Posted April 28, 2006 Now now... you don't want me to give away all of my DVD do you? Double Encore!!!!! What DVD are U talking about? Maybe I have to go to Blockbuster and ask for Christopher Nichols' DVD? Thanks Link to comment Share on other sites More sharing options...
archkre Posted April 28, 2006 Author Share Posted April 28, 2006 Ah!! you referred to The Gnomon ones! I found the data thru Google, excuse my ignorance! Link to comment Share on other sites More sharing options...
BrianKitts Posted April 28, 2006 Share Posted April 28, 2006 I know that every situation is differant but as GENERAL rule of thumb ....... I've pretty much learned there's only one GENERAL rule of thumb in architectural CG...... there are no solid rules of thumb!. Train your eyes to experience the real world and then critique what makes your scene different. That should help out your sun placement.... figuring it out yourself will allow you to learn so much more than soemone telling you where to put it. (OMG.... that sounded like a university proffessor statement, someone shoot me) ...this is not me trying to give anything away from Chris's dvd's, trust me you still need to get them, you will learn so much more in a few chapters than you could imagine..... things you never thought about, but should! Link to comment Share on other sites More sharing options...
Jason Matthews Posted May 1, 2006 Share Posted May 1, 2006 I just wanted to mention that the DVD is well worth it. I am new to vray and the Chris's knowledge and experience really helped me out. Thanks Chris. Link to comment Share on other sites More sharing options...
erevan Posted May 4, 2006 Share Posted May 4, 2006 Christopher: I don't understand how you are gonna get sharp shadows (sun like) with Vray lights and HDRI! Those only cast diffuse shadows, or am I wrong? Thanks You can choose what kind of shadows you want the light to cast. Isn't it? Link to comment Share on other sites More sharing options...
archkre Posted May 4, 2006 Author Share Posted May 4, 2006 You can choose what kind of shadows you want the light to cast. Isn't it? Not for Vraylights & HDRI, one doesn't have options! Link to comment Share on other sites More sharing options...
BunGHoLe Posted May 4, 2006 Share Posted May 4, 2006 I have some questions about the HDRIs I was browsing through dosch design library and I got a little confused... There were some HDRI like "cross" some black ones and some freaky stuff (here is link you will need a Adobe Acrobat Reader Dosch Design) So my question is when should I use the different types. All of my knowledge about HDRI and Vray a got from the Chris's DVDs but unfortunately he didn't use the freaky ones so I don't know how to use them. But aside that the DVDs are were very helpfull and helped me to get to the finals of National Informatics Olypiad 2006. And I also want to ask about that movie he is working on....how is it called...I'd like to see it and perhaps to learn some techniques. And also...are there any animated HDRIs. I think you can get some cool results from an animated HDRI for sky. Link to comment Share on other sites More sharing options...
BrianKitts Posted May 5, 2006 Share Posted May 5, 2006 Not for Vraylights & HDRI, one doesn't have options! actually thats not entirely true.... vraylights you can control the shadows.... its just not a rollout parameter like a standard light... Link to comment Share on other sites More sharing options...
archkre Posted May 5, 2006 Author Share Posted May 5, 2006 actually thats not entirely true.... vraylights you can control the shadows.... its just not a rollout parameter like a standard light... How can you do that? Link to comment Share on other sites More sharing options...
Christopher Nichols Posted May 5, 2006 Share Posted May 5, 2006 I have some questions about the HDRIs I was browsing through dosch design library and I got a little confused... There were some HDRI like "cross" some black ones and some freaky stuff (here is link you will need a Adobe Acrobat Reader Dosch Design) So my question is when should I use the different types. All of my knowledge about HDRI and Vray a got from the Chris's DVDs but unfortunately he didn't use the freaky ones so I don't know how to use them. But aside that the DVDs are were very helpfull and helped me to get to the finals of National Informatics Olypiad 2006. And I also want to ask about that movie he is working on....how is it called...I'd like to see it and perhaps to learn some techniques. And also...are there any animated HDRIs. I think you can get some cool results from an animated HDRI for sky. The cross is just another way of doing the environment map. The cross is often refered to as a cubic map (6 sides of a cube). The one I use is called a Lat/long map (or spherical). Either way it will work as long as you switch your VrayHDRIMap reader to do Cubic or Spherical. Link to comment Share on other sites More sharing options...
archkre Posted May 5, 2006 Author Share Posted May 5, 2006 The cross is just another way of doing the environment map. The cross is often refered to as a cubic map (6 sides of a cube). The one I use is called a Lat/long map (or spherical). Either way it will work as long as you switch your VrayHDRIMap reader to do Cubic or Spherical. Please, Christopher tell me how far, how intense and how to deal with the shadows of the Vraylight spherical acting as Sun! I promess I am gonna buy your Gnomon CD ASAP, when I can save $59 plus shipping & handling! Thank you very much! Link to comment Share on other sites More sharing options...
BrianKitts Posted May 5, 2006 Share Posted May 5, 2006 there really is no straight answer to your question.... they'res too many variables. For instance, what time of day, what month is it (sun direction), whats the scene material, is it all snow?? is it all black mulch (hmm not sure that exists).... anyways, other influences, what are the imbedded intesity values for your hdri, this varies between different hdr's obviously. How big is the diameter on your vray light (hint...hint)... and what is it's intensity? pretty much you need to just start playing with your values till you find something that fits your scene. Now Chris's DVDs will give you a good eye towards what you need to focus on, but thats more of something you need to hear see and exprience not something that could be dropped into a thread without composing a novel. the best thing for you to do would be to setup your scene, play with it, and start posting in the WIP forum and try to get some comments to help you improve your scene... that way you get your answer.... and learn why you need to change it.... Link to comment Share on other sites More sharing options...
Christopher Nichols Posted May 5, 2006 Share Posted May 5, 2006 Thank you Brian... well said. Remember we are artists not mechanics. Link to comment Share on other sites More sharing options...
archkre Posted May 7, 2006 Author Share Posted May 7, 2006 actually thats not entirely true.... vraylights you can control the shadows.... its just not a rollout parameter like a standard light... How can you do that, please? Link to comment Share on other sites More sharing options...
erevan Posted May 8, 2006 Share Posted May 8, 2006 I don't have vray here, but I think there's a rollout in the vray light, that allows you to choose what kind of shadow. I can't check it here, though! However, with HDRI you can't do anything with shadows, you're right. Link to comment Share on other sites More sharing options...
archkre Posted May 11, 2006 Author Share Posted May 11, 2006 How can you do that, please? Again asking the same ,please! Link to comment Share on other sites More sharing options...
archkre Posted May 11, 2006 Author Share Posted May 11, 2006 Thank you Brian... well said. Remember we are artists not mechanics. Well, it is the old controversy about us, Architects ! Are we artists or technicians? I think we are a much more complex combo: Artists, technicians, paralegals, accountants, engeneers, mechanics, salesmen.....! Link to comment Share on other sites More sharing options...
erevan Posted May 15, 2006 Share Posted May 15, 2006 I was wrong. As usual. The vray light has only the option to check to smooth surface shadows. Maybe it's a question of manipulating other parameters. Link to comment Share on other sites More sharing options...
archkre Posted May 22, 2006 Author Share Posted May 22, 2006 Dear Mr. Nichols: After having watched your very interesting video on Vray-Exteriors, some questions arise: *Why do you always use QMC as secondary (which is a brute force method) and not Light Cache e.g.? *When you use that illumination card for the interior of that structure to receive light, why don't you simple increase the light absorbing properties of those dark zones? *In the same scene you use a 30M diameter "sun", if we work in feet/inches, should we use the conversion factor and have a 90 feet diam. sun ? I presume that the intensity remains the same. In the scene of the dominoes, I notice the intensity of the sun climbs to 600!! Why? *How do you use HDRI's in the environment section , but this time for reflexions? * When to use exponential and when HDSexponential exposure? Thanks a lot for your great help! Link to comment Share on other sites More sharing options...
myusuf Posted March 24, 2009 Share Posted March 24, 2009 what is the placing of vray sphere and its radius...Is it exactly above the building? Link to comment Share on other sites More sharing options...
benitoben Posted March 24, 2009 Share Posted March 24, 2009 Hi Guys! nice discussion! i have one question, i've been trying now for weeks to find the best settings for a combination of vraysun and hdri with no luck, it can(i believe) produce good results. i used a sphere and assigned a vraymaterial to it, with hdri as map.so i want to know if anyone of has tried this before. thanks! Link to comment Share on other sites More sharing options...
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