<div dir="ltr"><div class="gmail_default" style="font-family:arial narrow,sans-serif">What matters here is if it's possible to control what a light (or a group of objects/lamps) is seen by. <br>But i say, couldn't it be made at a higher and more useful level, like having "Is object" or, maybe better "Is group" in the lightpath node?<br></div><div class="gmail_default" style="font-family:arial narrow,sans-serif">I don't know how nodes work, but aren't "diffuse", "glossy", "shadow", etc... some sort of "tags" attached to the rays? Wouldn't it be possible to attach also a tag that says what an object/group is?<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-01-18 12:00 GMT+01:00 <span dir="ltr"><<a href="mailto:bf-cycles-request@blender.org" target="_blank">bf-cycles-request@blender.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Bf-cycles mailing list submissions to<br>
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<br>Today's Topics:<br>
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1. "Is SSS ray" output and ray visibility (Greg Zaal)<br>
2. Re: "Is SSS ray" output and ray visibility (Sergey Sharybin)<br>
3. Re: "Is SSS ray" output and ray visibility (Matthew Heimlich)<br>
4. Re: "Is SSS ray" output and ray visibility (Greg Zaal)<br>
<br><br>---------- Messaggio inoltrato ----------<br>From: Greg Zaal <<a href="mailto:gregzzmail@gmail.com">gregzzmail@gmail.com</a>><br>To: <a href="mailto:bf-cycles@blender.org">bf-cycles@blender.org</a><br>Cc: <br>Date: Sat, 17 Jan 2015 15:51:13 +0200<br>Subject: [Bf-cycles] "Is SSS ray" output and ray visibility<br><div dir="ltr"><div><div><div>Hey folks :)<br><br></div>Is it possible to have a Ray Visibility switch for SSS, and possibly an "Is SSS ray" output for the light path node too? Or possibly just combine it with the Diffuse ray.<br><br></div>Why would this help?<br></div><ul><li>At the moment it's impossible to have a light that only influences glossy rays - artists sometimes like to control their specular highlights separately (e.g. make them more prominent in the eyes) without affecting the rest of the lighting. If you have no SSS shaders, you can just disable everything except glossy in the Ray Visibility panel - but if you do have some SSS, it is doomed to be lit as well.<br>See here: <a href="http://i.imgur.com/n2bNWvp.png" target="_blank">http://i.imgur.com/n2bNWvp.png</a> - one red light underneath that influences everything, and one blue light above that's only supposed to influence glossy (sphere materials left to right: diffuse, glossy, glass, SSS)<br></li><li>I wrote a light manager add-on that is able to "turn off" the World lighting temporarily by disabling all the Ray Visibility switches. Sure this is a hacky solution, but it's more reliable than fiddling with the nodes.</li></ul><p>So yeah - is this even possible? And if so, who I do I have to buy beer for to make it happen? :)</p><p>Cheers,<br>Greg<br></p></div>
<br><br>---------- Messaggio inoltrato ----------<br>From: Sergey Sharybin <<a href="mailto:sergey.vfx@gmail.com">sergey.vfx@gmail.com</a>><br>To: <a href="mailto:bf-cycles@blender.org">bf-cycles@blender.org</a><br>Cc: <br>Date: Sat, 17 Jan 2015 20:33:15 +0600<br>Subject: Re: [Bf-cycles] "Is SSS ray" output and ray visibility<br><div dir="ltr">That's probably possible, but sounds a bit malformed. Internally SSS ray only exists in medium with SSS shader and used for light attenuation in the medium. From this point of view SSS ray visibility makes no sense sine disabling it would basically mean removing SSS closure from the object. That's not what you want i bet.<div><br></div><div>So main question is what you consider SSS ray.</div><div><br></div><div>Is it any ray after subsurface transmission as SSS ray? This is somewhat weird for scenes when having multiple SSS objects, especially when having smoke.</div><div>Or is it first bounce after SSS transmission as a SSS ray? In this case you wouldn't be able to make SSS ignoring reflected light.<br></div><div><br></div><div>What's the real-life example of such a setup you're trying to achieve? (assuming Cycles is more or less physical based your setup seems a bit weird :)</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jan 17, 2015 at 6:51 PM, Greg Zaal <span dir="ltr"><<a href="mailto:gregzzmail@gmail.com" target="_blank">gregzzmail@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hey folks :)<br><br></div>Is it possible to have a Ray Visibility switch for SSS, and possibly an "Is SSS ray" output for the light path node too? Or possibly just combine it with the Diffuse ray.<br><br></div>Why would this help?<br></div><ul><li>At the moment it's impossible to have a light that only influences glossy rays - artists sometimes like to control their specular highlights separately (e.g. make them more prominent in the eyes) without affecting the rest of the lighting. If you have no SSS shaders, you can just disable everything except glossy in the Ray Visibility panel - but if you do have some SSS, it is doomed to be lit as well.<br>See here: <a href="http://i.imgur.com/n2bNWvp.png" target="_blank">http://i.imgur.com/n2bNWvp.png</a> - one red light underneath that influences everything, and one blue light above that's only supposed to influence glossy (sphere materials left to right: diffuse, glossy, glass, SSS)<br></li><li>I wrote a light manager add-on that is able to "turn off" the World lighting temporarily by disabling all the Ray Visibility switches. Sure this is a hacky solution, but it's more reliable than fiddling with the nodes.</li></ul><p>So yeah - is this even possible? And if so, who I do I have to buy beer for to make it happen? :)</p><p>Cheers,<br>Greg<br></p></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><div><span style="color:rgb(102,102,102)">With best regards, Sergey Sharybin</span></div></div>
</div>
<br><br>---------- Messaggio inoltrato ----------<br>From: Matthew Heimlich <<a href="mailto:matt.heimlich@gmail.com">matt.heimlich@gmail.com</a>><br>To: <a href="mailto:bf-cycles@blender.org">bf-cycles@blender.org</a><br>Cc: <br>Date: Sat, 17 Jan 2015 09:42:39 -0500<br>Subject: Re: [Bf-cycles] "Is SSS ray" output and ray visibility<br><div dir="ltr">I think what Greg is going for is a lamp that would only affect glossy materials, for artistic highlights on eyes and such. Currently this is impossible because there's no way to turn off the influence of a lamp on a material with SSS. So it's not so much a request for turning off the SSS of the material, but rather the influence of the individual lamp.</div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jan 17, 2015 at 9:33 AM, Sergey Sharybin <span dir="ltr"><<a href="mailto:sergey.vfx@gmail.com" target="_blank">sergey.vfx@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">That's probably possible, but sounds a bit malformed. Internally SSS ray only exists in medium with SSS shader and used for light attenuation in the medium. From this point of view SSS ray visibility makes no sense sine disabling it would basically mean removing SSS closure from the object. That's not what you want i bet.<div><br></div><div>So main question is what you consider SSS ray.</div><div><br></div><div>Is it any ray after subsurface transmission as SSS ray? This is somewhat weird for scenes when having multiple SSS objects, especially when having smoke.</div><div>Or is it first bounce after SSS transmission as a SSS ray? In this case you wouldn't be able to make SSS ignoring reflected light.<br></div><div><br></div><div>What's the real-life example of such a setup you're trying to achieve? (assuming Cycles is more or less physical based your setup seems a bit weird :)</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Sat, Jan 17, 2015 at 6:51 PM, Greg Zaal <span dir="ltr"><<a href="mailto:gregzzmail@gmail.com" target="_blank">gregzzmail@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div><div><div>Hey folks :)<br><br></div>Is it possible to have a Ray Visibility switch for SSS, and possibly an "Is SSS ray" output for the light path node too? Or possibly just combine it with the Diffuse ray.<br><br></div>Why would this help?<br></div><ul><li>At the moment it's impossible to have a light that only influences glossy rays - artists sometimes like to control their specular highlights separately (e.g. make them more prominent in the eyes) without affecting the rest of the lighting. If you have no SSS shaders, you can just disable everything except glossy in the Ray Visibility panel - but if you do have some SSS, it is doomed to be lit as well.<br>See here: <a href="http://i.imgur.com/n2bNWvp.png" target="_blank">http://i.imgur.com/n2bNWvp.png</a> - one red light underneath that influences everything, and one blue light above that's only supposed to influence glossy (sphere materials left to right: diffuse, glossy, glass, SSS)<br></li><li>I wrote a light manager add-on that is able to "turn off" the World lighting temporarily by disabling all the Ray Visibility switches. Sure this is a hacky solution, but it's more reliable than fiddling with the nodes.</li></ul><p>So yeah - is this even possible? And if so, who I do I have to buy beer for to make it happen? :)</p><p>Cheers,<br>Greg<br></p></div>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div><div><span style="color:rgb(102,102,102)">With best regards, Sergey Sharybin</span></div></div>
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<br><br>---------- Messaggio inoltrato ----------<br>From: Greg Zaal <<a href="mailto:gregzzmail@gmail.com">gregzzmail@gmail.com</a>><br>To: <a href="mailto:bf-cycles@blender.org">bf-cycles@blender.org</a><br>Cc: <br>Date: Sat, 17 Jan 2015 18:03:48 +0200<br>Subject: Re: [Bf-cycles] "Is SSS ray" output and ray visibility<br><div dir="ltr"><div><div>Yep, Matt is right.<br><br></div>Clearly I don't understand anything about SSS - all I want is to be able to prevent a light from affecting SSS shaders by disabling the SSS ray visibility on the lamp object (so that it can only affect glossy shaders and nothing else).<br><br></div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On 17 January 2015 at 16:42, Matthew Heimlich <span dir="ltr"><<a href="mailto:matt.heimlich@gmail.com" target="_blank">matt.heimlich@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I think what Greg is going for is a lamp that would only affect glossy materials, for artistic highlights on eyes and such. Currently this is impossible because there's no way to turn off the influence of a lamp on a material with SSS. So it's not so much a request for turning off the SSS of the material, but rather the influence of the individual lamp.</div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Jan 17, 2015 at 9:33 AM, Sergey Sharybin <span dir="ltr"><<a href="mailto:sergey.vfx@gmail.com" target="_blank">sergey.vfx@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">That's probably possible, but sounds a bit malformed. Internally SSS ray only exists in medium with SSS shader and used for light attenuation in the medium. >From this point of view SSS ray visibility makes no sense sine disabling it would basically mean removing SSS closure from the object. That's not what you want i bet.<div><br></div><div>So main question is what you consider SSS ray.</div><div><br></div><div>Is it any ray after subsurface transmission as SSS ray? This is somewhat weird for scenes when having multiple SSS objects, especially when having smoke.</div><div>Or is it first bounce after SSS transmission as a SSS ray? In this case you wouldn't be able to make SSS ignoring reflected light.<br></div><div><br></div><div>What's the real-life example of such a setup you're trying to achieve? (assuming Cycles is more or less physical based your setup seems a bit weird :)</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Sat, Jan 17, 2015 at 6:51 PM, Greg Zaal <span dir="ltr"><<a href="mailto:gregzzmail@gmail.com" target="_blank">gregzzmail@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div><div><div>Hey folks :)<br><br></div>Is it possible to have a Ray Visibility switch for SSS, and possibly an "Is SSS ray" output for the light path node too? Or possibly just combine it with the Diffuse ray.<br><br></div>Why would this help?<br></div><ul><li>At the moment it's impossible to have a light that only influences glossy rays - artists sometimes like to control their specular highlights separately (e.g. make them more prominent in the eyes) without affecting the rest of the lighting. If you have no SSS shaders, you can just disable everything except glossy in the Ray Visibility panel - but if you do have some SSS, it is doomed to be lit as well.<br>See here: <a href="http://i.imgur.com/n2bNWvp.png" target="_blank">http://i.imgur.com/n2bNWvp.png</a> - one red light underneath that influences everything, and one blue light above that's only supposed to influence glossy (sphere materials left to right: diffuse, glossy, glass, SSS)<br></li><li>I wrote a light manager add-on that is able to "turn off" the World lighting temporarily by disabling all the Ray Visibility switches. Sure this is a hacky solution, but it's more reliable than fiddling with the nodes.</li></ul><p>So yeah - is this even possible? And if so, who I do I have to buy beer for to make it happen? :)</p><p>Cheers,<br>Greg<br></p></div>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div><div><span style="color:rgb(102,102,102)">With best regards, Sergey Sharybin</span></div></div>
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