| Light and images in a IDLgrView [message #38524] |
Wed, 17 March 2004 09:44  |
Antonio Santiago
Messages: 201
Registered: February 2004
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Senior Member |
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Hi
i amb using IDL object Graphics and i just have contruct a view with a
volume, a surface, axis and a box. I want to do a slice of axis Y and
view this with an image. I do all this right (and the image have the
slice of the volume in Y axis) but the problem is the orientation of the
model respect the light. Depends on it, the image is visible or is black :(
Is there any tip to tell me how to simplify the work of positioning
lights in a model. The surface is ok iluminatin but images are argggg....
Thanks
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| Re: Light and images in a IDLgrView [message #38704 is a reply to message #38524] |
Sun, 21 March 2004 23:29  |
Antonio Santiago
Messages: 201
Registered: February 2004
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Senior Member |
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Thanks i found my problem.
Yes, i saw your doc and your examples (FSC_SURFACE) but i continued with
my problem. It was basically that i had created my polygons with an
image like a texture map with the bad options and the light doesnt
iluminate it good.
Thanks anyway ;)
David Fanning wrote:
> Antonio Santiago writes:
>
>
>> i amb using IDL object Graphics and i just have contruct a view with a
>> volume, a surface, axis and a box. I want to do a slice of axis Y and
>> view this with an image. I do all this right (and the image have the
>> slice of the volume in Y axis) but the problem is the orientation of the
>> model respect the light. Depends on it, the image is visible or is black :(
>>
>> Is there any tip to tell me how to simplify the work of positioning
>> lights in a model. The surface is ok iluminatin but images are argggg....
>
>
> Support the arts and hire a theater student. They need
> the money and they can have you fixed up in about 2 minutes. :-)
>
> Sometimes it is good to have a set of lights that don't
> rotate with the model and another set that do. See, for
> example, the lights in my FSC_SURFACE program.
>
> Cheers,
>
> David
>
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| Re: Light and images in a IDLgrView [message #38705 is a reply to message #38524] |
Sun, 21 March 2004 15:59 |
cartik_sharma
Messages: 4
Registered: March 2004
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Junior Member |
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The following scene graph might resolve your lighting issues:
---->oLightModel
1. oScene-|
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---->oGeometryModel
In 1., rotating oGeometryModel, leaves oLightModel out of sync!
2.
---->oLightModel
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oScene-->oModel---|
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---->oGeometryModel
In 2., rotating oModel, gives oLightModel the same rotation as
oGeometryModel preserving original lighting effects.
Another way to accomplish the same would be to retrieve the relative
transformation b/w the light model and the geometry model, and apply
it to the lightmodel, every time the geometry model is rotated.
Hope this helps,
Cartik
David Fanning <david@dfanning.com> wrote in message news:<MPG.1ac520c216d2805b989704@news.frii.com>...
> Antonio Santiago writes:
>
>> i amb using IDL object Graphics and i just have contruct a view with a
>> volume, a surface, axis and a box. I want to do a slice of axis Y and
>> view this with an image. I do all this right (and the image have the
>> slice of the volume in Y axis) but the problem is the orientation of the
>> model respect the light. Depends on it, the image is visible or is black :(
>>
>> Is there any tip to tell me how to simplify the work of positioning
>> lights in a model. The surface is ok iluminatin but images are argggg....
>
> Support the arts and hire a theater student. They need
> the money and they can have you fixed up in about 2 minutes. :-)
>
> Sometimes it is good to have a set of lights that don't
> rotate with the model and another set that do. See, for
> example, the lights in my FSC_SURFACE program.
>
> Cheers,
>
> David
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| Re: Light and images in a IDLgrView [message #38715 is a reply to message #38524] |
Fri, 19 March 2004 14:23 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Antonio Santiago writes:
> i amb using IDL object Graphics and i just have contruct a view with a
> volume, a surface, axis and a box. I want to do a slice of axis Y and
> view this with an image. I do all this right (and the image have the
> slice of the volume in Y axis) but the problem is the orientation of the
> model respect the light. Depends on it, the image is visible or is black :(
>
> Is there any tip to tell me how to simplify the work of positioning
> lights in a model. The surface is ok iluminatin but images are argggg....
Support the arts and hire a theater student. They need
the money and they can have you fixed up in about 2 minutes. :-)
Sometimes it is good to have a set of lights that don't
rotate with the model and another set that do. See, for
example, the lights in my FSC_SURFACE program.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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