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ROTATE MODEL [message #66592]

Tue, 26 May 2009 10:43

natha
Messages: 482
Registered: October 2007

Senior Member

Hi people,

I've 2 IDLgrImages into an IDLgrModel and I want to rotate the images
30 degrees.
I tried to use the IDLgrModel::Rotate method and I did not succeed
with the rotation.

I tried a lot of combinations:
model->rotate, [0,0,0], 30
model->rotate, [1,0,0], 30
etc..

Why the images don't rotate? grgrgggrrrr ....
How to do that ?

Thanks in advance,
nata

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Re: ROTATE MODEL [message #66667 is a reply to message #66592]

Wed, 27 May 2009 10:17

natha
Messages: 482
Registered: October 2007

Senior Member

On May 27, 12:04 pm, Rick Towler <rick.tow...@nomail.noaa.gov> wrote:
> nata wrote:
>> I've a last question related with this discussion.
>> There is a way to rotate IDLgrPolyline objects ? I mean, IDlgrImage
>> has the /TRANSFORM_MODE keyword but if I use others graphics objects I
>> can't rotate them. So, if it's possible to rotate graphics objects in
>> general ?
>
> Not in the same way. Generally you only apply transformations
> (rotations, translations, etc) on models. Hence the Rotate and
> Translate methods of IDLgrModel. So if you want to rotate polyline,
> surface, or polygon objects you place them in an IDLgrModel and use its
> rotate method.
>
> IDLgrImage is different. Since images aren't comprised of polygons
> there are no vertices to transform so adding an image object to a model
> and transforming it doesn't do anything. To actually transform an image
> you have to create a planar polygon, texture map the image onto it, then
> transform this polygon. This caused much "confusion and delay" so
> RSI/ITT added the Transform_Mode keyword to IDLgrImage which does the
> hard work for you.
>
> So only IDLgrImage has (or needs) the Transform_Mode keyword. All other
> graphics objects are comprised of vertices and can be transformed via
> IDLgrModel methods.
>
> -Rick

Ok, I understand.

I see, my polyline object rotates automatically. If I want to rotate
only some objects I've to use 2 IDLgrModels. Then I could rotate some
ones and don't do anything with the others.

Thank you for your replies guys,
nata

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Re: ROTATE MODEL [message #66668 is a reply to message #66592]

Wed, 27 May 2009 09:04

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

nata wrote:
> I've a last question related with this discussion.
> There is a way to rotate IDLgrPolyline objects ? I mean, IDlgrImage
> has the /TRANSFORM_MODE keyword but if I use others graphics objects I
> can't rotate them. So, if it's possible to rotate graphics objects in
> general ?

Not in the same way. Generally you only apply transformations
(rotations, translations, etc) on models. Hence the Rotate and
Translate methods of IDLgrModel. So if you want to rotate polyline,
surface, or polygon objects you place them in an IDLgrModel and use its
rotate method.

IDLgrImage is different. Since images aren't comprised of polygons
there are no vertices to transform so adding an image object to a model
and transforming it doesn't do anything. To actually transform an image
you have to create a planar polygon, texture map the image onto it, then
transform this polygon. This caused much "confusion and delay" so
RSI/ITT added the Transform_Mode keyword to IDLgrImage which does the
hard work for you.

So only IDLgrImage has (or needs) the Transform_Mode keyword. All other
graphics objects are comprised of vertices and can be transformed via
IDLgrModel methods.

-Rick

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Re: ROTATE MODEL [message #66669 is a reply to message #66592]

Wed, 27 May 2009 08:54

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

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