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1
14-07-2006
, 07:09 PM
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creating realistic light for a lampshade
any hints are much appreciated.
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14-07-2006
, 09:05 PM
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1) created light fog which gave a nice shading inside the lamp, but killed all the reflections on the outside. in addition, alltho with raytracing activated and a point light inside I wasn´t able to create those significant rays within the fog where the light comes through the deleted faces.
2) tried it with particles too, but that just dips everything into a homogenous nebula...
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14-07-2006
, 09:17 PM
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14-07-2006
, 10:47 PM
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As for the rest of it, it'd help to know exactly what effect you were going for. Although personally I'd maybe make the lampshade either partially transparent, or translucent. Try that to start with, perhaps.
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14-07-2006
, 11:09 PM
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what I want is some light bulbs inside which light the scene - they should be visible when rendered. I need them to light the inside of the lampshade as bright as possible, allmost glowing like in real world and the light to emit through the holes and create visible rays like the sun shining through windows into a dark room with dirty air.
right now I dont get the inside lit like needed. in addition the light has influence on the outside of the lamp, which I dont understand, cause raytracing shadows is active and there is no other light source than from the inside..
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Last edited by Falott; 14-07-2006 at 11:12 PM.
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15-07-2006
, 01:27 AM
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15-07-2006
, 07:05 AM
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First off, its pointless to have more than one actual light inside the lamp, really. Yes, in an ultra-realistic render, you might want more, but it shouldn't be too big a difference for what you want. So, just make a single point light, and stick it in the middle of the lamp. And make it a bit on the more diffuse end, than on the sharp end.
Then model a lightbulb. Doesn't have to be much, really. We're going to make that glow instead. When you go to glow intensity, hit that button off to the right and assign a ramp to it - make it really intense at the core, drop quickly, and maintain a low level throughout. Also, if this is a house lamp, make the light slightly yellow - stark white is unsettling.
About the shade itself - If the inside is black, you're going to have problems with the thing appearing to be lit, wether it is or not. The lighter the color is, the better it'll show up. Try lightening the inside color. If, on the other hand, your lampshade is composed of planes, you're going to have to extrude faces so it actually has thickness (which may solve some of your other illumination problems, as well).
As for the dusty-air bit... Well, I've never messed with a lightfog, so I have no idea what would happen. But seems to me you could just throw a bumch of particles with a really long lifespan into the general area. But don't pack them too densely....
All I can think of at the moment....
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15-07-2006
, 08:43 AM
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one thing you mentioned is the black color inside. alltho the whole thing is extruded and allready has thickness it doesn´t prevent the light to have effect on the outside. btw the lampshade was initially lit with a pointlight. what you see are just a bunch of spheres glowing. I did set the light up now with a spotlight, added a physical_light to its lightShader plus used a parti_volume for creating this sunbeam effect. I didn´t find any other solution with mental ray. found this tut on the net which was quite what I needed.
https://www.jhavna.net/main.php?page=scatter
again, thank you for your support. I´ll post updates later when I´ve tried your suggestions.
everything starts and ends in the right place at the right time.
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