How to put a color bar beside my Scene graph - Graphics

"Sirinus Zhang" <sirinus@excite.com> writes:

> I draw a complicate scene graph. In this scene graph, I used different
> colors to show different things. How can I show a legend using a color
> bar with text beside the scene graph. You know my scene graph is a 3D
> scene. A user is allowed to zoom and turen around the scene to view it
> in different perspect, but I don't want the color bar to be changed when
> the scene is zoomed in/out, or turned around.

You should probably set up a new camera and viewport for the legend
scene graph.

Coin's SmallChange CVS repository has some example extension nodes,
including a LegendKit node kit that you can use directly or as
example code to implement your own node.

You can check out SmallChange from the same CVSROOT as Coin.

Peder

"Sirinus Zhang" <sirinus@excite.com> wrote in message news:<bb8b969f791d8ce2bd42fe22dc2b13e0.122597@mygate.mailgate.org>...
> I draw a complicate scene graph. In this scene graph, I used different
> colors to show different things. How can I show a legend using a color
> bar with text beside the scene graph. You know my scene graph is a 3D
> scene. A user is allowed to zoom and turen around the scene to view it
> in different perspect, but I don't want the color bar to be changed when
> the scene is zoomed in/out, or turned around.

Just add two cameras in the scene graph, normally one
perspective camera and one orthographic camera. Put
your 3D data after the perspective camera. Put your
legend after the second (orthographic) camera. The
viewer will attach to the first camera it finds, which
should be the perspective camera. So moving the mouse
will only modify the perspective camera.

-Mike
TGS Inc, http://www.tgs.com

Thanks a lot


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