Re: Depth shading question

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Chikai Ohazama (chikai@talula)
Wed, 3 Nov 1999 10:37:42 -0800

Use "black" fog. I'm not sure what the exact commands are in OpenGL, but
instead of using the traditional white fog, just use a black color.

________________________________________________________________________
Chikai J. Ohazama, Ph.D. SGI
Scientific Visualization 1600 Amphitheatre Pkwy., ms 525
AGD Applied Engineering Mountain View, CA 94043.1351
                                     Telephone: (650) 933-6533
                                     FAX: (650) 932-6533
On Wed, 3 Nov 1999, Mark Davey wrote:

> Hi....
> I wish to change the default volume rendering technique given in the
> demos so that parts of the rendered object that are further away from
> the camera appear darker. In this way I hope to give the user depth
> information which can be useful in interpreting certain types of image.
>
> I can change the colour of each polygon thats goes to make up the volume
> rendered image. I now need to find out the distance of the polygon from
> the camera. The polygons generated using the
> voGeometryActions::polygonize command have their coordinates relative to
> the volume and not the world coordinates. I could transform these so
> that they are in world coordinates, but by now, I am wondering if there
> is an easier way of generating a depth enhanced image!!!!
>
> So does anyone have any ideas??
>
> Regards
> Mark...
>
> --
> From: Mark Davey
> Dept. of Medical Physics, UCL.
>
> TEL: +44 (0)171 915 1673.
> FAX: +44 (0)171 837 9279.
>
> Institute of Laryngology and Otology,
> 330 Gray's Inn Road,
> London.
> WC1X 8GE.
>
>
>

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