| 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
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
