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Thread: Lighting on wrong side? which part of Manual?

  1. #1

    Lighting on wrong side? which part of Manual?

    Can anyone point me to that part of the manual which explains lighting in layout with respect to having a light on one side of an object, but layout showing the Opposite side of that object illuminated?

    When I hit F9, the object is shown lit from the side where I have my light.

    is this an OPen GL thing?

    J
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  2. #2
    self flagellating LW monk
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    johnny are your normals flipped?
    look up "surface normals" in the manual.
    if thats not it, then you have to describe it more accurately for me to understand your plight, sorry.

  3. #3
    the normals are pointing out..is that what you're asking, as opposed to normals pointing inward?

    some times I notice the correct side of an object is lit, but when I move or rotate a lite, say, to the right, the left side gets brighter, IOW the opposite side of that receiving light actually shows the light.

    seems like something is reversed...

    J
    Last edited by Johnny; 02-02-2004 at 09:27 AM.
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  4. #4
    Are you looking at the object from the other side? (ie, camera positioned to look at the front, viewport looking at the back?)

  5. #5
    it would be in perspective view..the one that lets you dolly all around the scene..

    camera and light will be on one side, for example, but the OGL preview of the item is lighted opposite where the light is pointing.

    J
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  6. #6
    can you post a screengrab?

  7. #7
    I can't re-create it..should have taken a screencap yesterday when I saw it first...

    but, literally, the light was shining on one side, but it was the opposite side of this element which appeared to be illuminated.

    Is this related to the fact that when you work on surfaces, the little sphere preview appears in darkness, tho you know you have lights pointed on it?

    J
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  8. #8
    LightWave documentation BeeVee's Avatar
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    Were you using a distant light? Had you changed its rotation? Distant lights only have direction and not proximity, so it wouldn't matter if you had a distant light pointing right on the right side of an object. The left side would still be lit.

    B

    PS. Edited with an example. There is only one light in this scene.
    Last edited by BeeVee; 02-02-2004 at 10:59 AM.
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  9. #9
    Originally posted by BeeVee
    Were you using a distant light? Had you changed its rotation? Distant lights only have direction and not proximity, so it wouldn't matter if you had a distant light pointing right on the right side of an object. The left side would still be lit.
    that occurred to me too, but wouldn't the open gl view display that properly?

  10. #10
    LightWave documentation BeeVee's Avatar
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    That IS displayed properly. Here's the pic

    B
    Ben Vost - NewTek LightWave 3D development
    LightWave 3D Trial Edition
    AMD Threadripper 1950X, Windows 10 Pro 64-bit, 32GB RAM, nVidia GeForce GTX 1050Ti (4GB and 768 CUDA cores) and GTX 1080 (8GB and 2560 CUDA cores) driver version 430.86
    AMD FX8350 4.2 GHz, Windows 7 SP1 Home Premium 64-bit, 16GB RAM, nVidia GeForce GTX 1050Ti (416.34, 4GB and 768 CUDA cores)
    Dell Server, Windows 10 Pro, Intel Xeon E3-1220 @3.10 GHz, 8 GB RAM, Quadro K620
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  11. #11
    Originally posted by BeeVee
    That IS displayed properly. Here's the pic

    B
    OK..BeeVee, that is what I saw except that my light was pointing right AT the cube.

    I had loaded the wood.lwo to test something else, and had a WTF moment when I saw the light direction didn't correspond to the illumination of the cube...moving the light had a reverse effect on which side was lit.

    wierd...

    J
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