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Poser - OFFICIAL F.A.Q (Last Updated: 2024 Dec 22 8:51 pm)



Subject: Looking for Tut on lights in lamps


grichter ( ) posted Mon, 26 February 2007 at 11:53 AM · edited Sun, 22 December 2024 at 11:24 AM

Attached Link: Contemporary Foyer

Newbee of sorts to Poser 7 Anybody point me at a good tutorial for how to model lights in lamps. What I mean is make it so it looks like the lamps is on and their is a yellowish light coming out of it. Messing around with the Contemporary Foyer  found here http://market.renderosity.com/mod/bcs/index.php?ViewProduct=26022 and linked above.

and it comes with a table lamp and a 3 bulb hanging light fixture over the entry way. I have seen this done before in the galleries, etc. Or is adding the yellow cast done in post work? I can get the lights in the proper positions (inside the fixtures), just can't get them to render like I want.

Think A.) Vicki has a blind date with Michael and she needs the lights on to answer the door and see if his body Morphs and skin textures are handsome enough. B.) Her mother (see In praise of older women characters) is standing at the base of stairs waiting to lash out with 20 questions about why Michael didn't get her back home at the agreed upon time! . Both need proper lighting from the fixtures to make the scenes look real.

TIA

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"


ockham ( ) posted Mon, 26 February 2007 at 12:01 PM

The yellow cast is easy enough... just set the Ambient color of the
bulb's material to yellow and the Ambient Value to 1 (or more if Poser will
let you.)

For illumination, it's usually best to put a spotlight just below the
bulb and raise its Angle End to a high value.  (You might have
to increase the Max value of this parameter; for some reason it's
normally limited to 160 degrees but will actually go wider than that.)

Sometimes you need a pair of spotlights at the same location,
one pointing down and the other pointing up, to get a full illumination ...
it sort of depends on how the lamp is meant to work.

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thefixer ( ) posted Mon, 26 February 2007 at 12:22 PM

Point lights are usually good for bulbs as they throw the light in all directions.
If you're after like light beams or light casting I think you maybe mean Volumetric lighting, do you?
Sorry I'm not sure if that's what you were asking!!

Injustice will be avenged.
Cofiwch Dryweryn.


grichter ( ) posted Mon, 26 February 2007 at 11:00 PM

There is a table lamp and what I am trying to do is make it look like there is light coming out the top and out the bottom of the shade. What I am seeing is the light if it hits something, like the ceiling or the table it is on lets say. Not show a yellow cast in the atmosphere like I want. I am missing some piece of the puzzle. And thanks for the replies

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"


thefixer ( ) posted Tue, 27 February 2007 at 1:42 AM

If it's  a table lamp with a shade then the best way would be 2 spots, one pointing up and one down. Use volumetric light for the bottom one and adjust your end point for the one pointing up, that will give you a spot of light on the ceiling.

Injustice will be avenged.
Cofiwch Dryweryn.


araknis ( ) posted Tue, 27 February 2007 at 2:17 AM

In another topic here Dale B wrote about a book by Jeremy Birn. He's a technical lighting director at Pixar: "Probably the first, and classic cheat he shows in passing is the table lamp and shade. Lots of newbies get frustrated with this kind of mesh; they think all they have to do is plop a point light where a bulb would go in real life, and it works just like the real thing. Except it doesn't, due to facts like light bulbs are acting as diffuse scattering shells for a source of light that is actually linear (look at a filament; not just a point in space, is it). Lampshades typically have white interiors of translucent cardboard, reflecting much of the light from the bulb back inwards (and bleeding some light through for decorative purposes, depending on the kind of shade it is. How much time would it take to model that shade with optically accurate materials or shaders applied to the required layers?), to eventually win free out the top or bottom of the shade, where interactions with the atmosphere and particulates create the perceived cones of light (and I'm not going to even try to get into atmospheric interactions....) The most common cheat? A point light and two spots, one pointing up, one down. The point basically just illuminates the shade for the bulb 'hotspot' and provides a bit of fill; the spots are what actually generate the light cones, and you have far more control over what is actually happening regarding your scene (you want a party environment? Keep the lamp spots at the same intensity, or make the upper one slightly brighter, to give a smoother fill to a scene. Need a dramatic desk shot? Dim the upper and increase the lower so that the eye is drawn towards the brighter area)." Hope that helps you (I know it was useful to me!).


grichter ( ) posted Tue, 27 February 2007 at 8:37 PM

Thanks for the data. It looks like I made a big mistake. In frustration I tore the scene down to just the table lamp floating in mid air so I could get the cans-spots located correctly and circle the lamp with the camera and not have the walls or other props get in the way. After thefixer mentioned volumetric lighting I did a search on the tuts here and found one that was a spot light on a character. It talks about atmospheric lighting etc. But one key issue it mentions is you need a background to make it work correctly. I did get it to cast a yellow light down onto the  lamp it's self. Up out of the shade nadda. I assume it is because there is no background going up and it is using the lamp body going down. Need to reassemble the scene and try again based on your suggestions. If I added any amount of slight ambient light, it seemed to over power the spot. But I think I just need to put the scene back together and try what you have mentioned. Thanks a ton for the assistance and getting me headed in the right direction.

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"


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