Lighting model interior with clipping plane - AccuRender nXt2024-03-28T09:48:31Zhttp://accurender.ning.com/forum/topics/lighting-model-interior-with?feed=yes&xn_auth=noIt might be possible to do it…tag:accurender.ning.com,2011-02-11:6293855:Comment:126992011-02-11T15:25:59.000ZRoy Hirshkowitzhttp://accurender.ning.com/profile/RoyHirshkowitz
It might be possible to do it with accurate data as well. Moonlight is technically about 500,000 times weaker than sunlight (0.000002) . The problem is that you may run into some threshold illumination levels with nXt-- I believe that 0.001 cd/m^2 is as low as you can go. Luminance in direct moonlit areas with reflective surfaces should still be in the range of 0.04 cd /m^2-- that's ok-- it's everything else I would worry about.
It might be possible to do it with accurate data as well. Moonlight is technically about 500,000 times weaker than sunlight (0.000002) . The problem is that you may run into some threshold illumination levels with nXt-- I believe that 0.001 cd/m^2 is as low as you can go. Luminance in direct moonlit areas with reflective surfaces should still be in the range of 0.04 cd /m^2-- that's ok-- it's everything else I would worry about. Normal daylight setting with…tag:accurender.ning.com,2011-02-11:6293855:Comment:126862011-02-11T09:20:54.000ZPeter Milnerhttp://accurender.ning.com/profile/PeterMilner
<p>Normal daylight setting with cloudiness=0.6 and sky brightness=0.5.</p>
<p>I used a dark blue as a background colour (could use black).</p>
<p>I turned down the brightness, contrast and saturation and finally added a bit more blue in Photoshop.</p>
<p>Normal daylight setting with cloudiness=0.6 and sky brightness=0.5.</p>
<p>I used a dark blue as a background colour (could use black).</p>
<p>I turned down the brightness, contrast and saturation and finally added a bit more blue in Photoshop.</p> What is the setup for this sc…tag:accurender.ning.com,2011-02-10:6293855:Comment:126732011-02-10T19:40:29.000Zakinlolu olugbojihttp://accurender.ning.com/profile/akinloluolugboji
What is the setup for this scene? Lighting Scheme, Tone generator term etc
What is the setup for this scene? Lighting Scheme, Tone generator term etc Nice. I would probably add a…tag:accurender.ning.com,2011-02-10:6293855:Comment:126542011-02-10T15:37:25.000ZRoy Hirshkowitzhttp://accurender.ning.com/profile/RoyHirshkowitz
Nice. I would probably add a little more desaturation to mimic what happens during night vision. Sky still looks a little too blue to me.
Nice. I would probably add a little more desaturation to mimic what happens during night vision. Sky still looks a little too blue to me. Yes, it's possible.
tag:accurender.ning.com,2011-02-10:6293855:Comment:126202011-02-10T10:36:56.000ZPeter Milnerhttp://accurender.ning.com/profile/PeterMilner
<p>Yes, it's possible.</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/55256805?profile=original"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/55256805?profile=RESIZE_1024x1024" class="align-full"/></a></p>
<p>Yes, it's possible.</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/55256805?profile=original"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/55256805?profile=RESIZE_1024x1024" class="align-full"/></a></p> It's always better to use rea…tag:accurender.ning.com,2011-02-09:6293855:Comment:125792011-02-09T19:49:35.000ZRoy Hirshkowitzhttp://accurender.ning.com/profile/RoyHirshkowitz
<p>It's <em>always</em> better to use realistic lighting values and modify the exposure setting. That message has been consistent throughout and hasn't changed. You may end up with a good picture doing the reverse, but the data will be garbage.</p>
<p> </p>
<p>You don't need to alter the brightness much for anything but exterior night scenes (which is what I consider your model to be.) In those cases I would start with -0.35.</p>
<p> </p>
<p>I haven't really looked around at night time…</p>
<p>It's <em>always</em> better to use realistic lighting values and modify the exposure setting. That message has been consistent throughout and hasn't changed. You may end up with a good picture doing the reverse, but the data will be garbage.</p>
<p> </p>
<p>You don't need to alter the brightness much for anything but exterior night scenes (which is what I consider your model to be.) In those cases I would start with -0.35.</p>
<p> </p>
<p>I haven't really looked around at night time hdrs-- but they'd be pretty easy to calibrate provided they capture a decent dynamic range. If you find a good one you can pass it to me and I'll let you know what scale factor to use. I didn't mean to say that it's hard to combine night background luminance and artificial lighting-- that's very easy. It is difficult to do an interior scene lit only by moonlight-- although probably quite possible.</p>
<p> </p>
<p> </p>
<p> </p> this looks closer to what we…tag:accurender.ning.com,2011-02-09:6293855:Comment:125782011-02-09T18:34:42.000ZRos. Rihahttp://accurender.ning.com/profile/RosRiha
<p>this looks closer to what we want to get... in the meantime I arrived to the similar result using brighness closer to 0 and light levels different from 1 - which way is better in terms of learning real facts from the simulation given by nXt? For example: would it be possible to state some recommended brightness levels for different tasks (nighttime, daytime... from dusk till dawn:-)</p>
<p>Yes, I already noticed that moonlit interior is not as easy as I orriginally thought... would it not be…</p>
<p>this looks closer to what we want to get... in the meantime I arrived to the similar result using brighness closer to 0 and light levels different from 1 - which way is better in terms of learning real facts from the simulation given by nXt? For example: would it be possible to state some recommended brightness levels for different tasks (nighttime, daytime... from dusk till dawn:-)</p>
<p>Yes, I already noticed that moonlit interior is not as easy as I orriginally thought... would it not be better to use some nighttime HDRI for such a specific task? Could you recommend something properly calibrated? Could you even add some other HDRIs to the default installation package? Like "nighttime", "dawn", "dusk"?</p> If you're shooting for a moon…tag:accurender.ning.com,2011-02-07:6293855:Comment:124782011-02-07T15:12:39.000ZRoy Hirshkowitzhttp://accurender.ning.com/profile/RoyHirshkowitz
<p>If you're shooting for a moonlit interior you have a difficult assignment on your hands. Use the brightness slider if you must.</p>
<p> </p>
<p>Here's a more rational example. I set the sky to 0.001 of it's daytime value-- not out of the question for night. All the other Channels are set to 1.f and the Brightness is reduce to -.37 (as before) to account for scotopic light levels.</p>
<p> …</p>
<p></p>
<p>If you're shooting for a moonlit interior you have a difficult assignment on your hands. Use the brightness slider if you must.</p>
<p> </p>
<p>Here's a more rational example. I set the sky to 0.001 of it's daytime value-- not out of the question for night. All the other Channels are set to 1.f and the Brightness is reduce to -.37 (as before) to account for scotopic light levels.</p>
<p> </p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/55256769?profile=original"><img class="align-full" width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/55256769?profile=RESIZE_1024x1024"/></a></p>
<p> </p> thanks for your advice - it d…tag:accurender.ning.com,2011-02-07:6293855:Comment:124512011-02-07T10:56:03.000ZRos. Rihahttp://accurender.ning.com/profile/RosRiha
<p>thanks for your advice - it did not occur to me to do it this simple using brightness...</p>
<p>Low luminance values: As I am not used to use brightness slider (I thought it should be kept at 1), I did decrease power of light sources - maybe too much.</p>
<p>Night-time exterior: You are probably right, on images such as this I would like to show both interior and exterior</p>
<p> </p>
<p>I am still struggling with Sky channel - even during the night there is some light from the sky... as you…</p>
<p>thanks for your advice - it did not occur to me to do it this simple using brightness...</p>
<p>Low luminance values: As I am not used to use brightness slider (I thought it should be kept at 1), I did decrease power of light sources - maybe too much.</p>
<p>Night-time exterior: You are probably right, on images such as this I would like to show both interior and exterior</p>
<p> </p>
<p>I am still struggling with Sky channel - even during the night there is some light from the sky... as you can see on the printscreen below, even if I set sky channel to the lowest value available, there is too much light - or do I misunderstand something again?</p>
<p>Using settings as these I would expect to get nighttime rendering instead this late afternoon one...</p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/55256802?profile=original"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/55256802?profile=RESIZE_1024x1024" class="align-full"/></a></p> So I took your drawing and se…tag:accurender.ning.com,2011-02-06:6293855:Comment:124412011-02-06T21:31:26.000ZRoy Hirshkowitzhttp://accurender.ning.com/profile/RoyHirshkowitz
<p>So I took your drawing and set all the lighting channels back to 1.0 where they belong. I then set the daylight channel (channel 0) to 0.0. I had to reduce the brightness to -0.37 -- not unusual for night-time exteriors. (Even though you may consider this model to be a night-time interior, it more closely resembles a night-time exterior to the tone mapper.) Your luminance values are a little low-- but not unreasonable. Here's what I got:</p>
<p> …</p>
<p></p>
<p>So I took your drawing and set all the lighting channels back to 1.0 where they belong. I then set the daylight channel (channel 0) to 0.0. I had to reduce the brightness to -0.37 -- not unusual for night-time exteriors. (Even though you may consider this model to be a night-time interior, it more closely resembles a night-time exterior to the tone mapper.) Your luminance values are a little low-- but not unreasonable. Here's what I got:</p>
<p> </p>
<p><a target="_self" href="http://storage.ning.com/topology/rest/1.0/file/get/55256807?profile=original"><img class="align-full" width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/55256807?profile=RESIZE_1024x1024"/></a></p>