Re: highlighting a re-used geode

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From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 02/20/2002 18:20:31

Hi Bram !

Why not add draw callbacks on the selected DCS ? You can add and remove
DRAW callbacks from nodes in an MP-safe way.

In the pre-draw callback, do:

          pfOverride(PFSTATE_HIGHLIGHT |
                     PFSTATE_ENHIGHLIGHTING,
                     PF_OFF);

          pfApplyHlight(hl); /* Some highlight object */
          pfEnable(PFEN_HIGHLIGHTING);

          pfOverride(PFSTATE_HIGHLIGHT |
                     PFSTATE_ENHIGHLIGHTING,
                     PF_ON);

and in the post-draw callback do:

          pfOverride(PFSTATE_HIGHLIGHT |
                     PFSTATE_ENHIGHLIGHTING,
                     PF_OFF);

OR, if you want to be more efficient, create one new geode and make it a clone
of your original instanced geode. Set highlight on the new geode. When you pick
a geode, remove it from its DCS and place the new geode instead. When you
un-pick the geode, restore the original un-highlighted geode to its DCS.

-yair

> I have a performer scene with hundreds of DCSes, which all contain the
> same geode.
>
> When implementing picking, I want a single geode to light up, when touched
> with a cursor (CAVE wand in my case).
>
> I currently use pfHighlight, and I enable highlighting for the geostates
> of the geosets of the selected geode.
>
> Ofcourse, ALL the geometry in my scene lights up, as I reuse a single
> piece of geometry in a lot of DCSes.
>
> How can I achieve the desired highlighting without replicating the geometry?
>
> I'm affraid I will have to remove and add children from the affected DCS?
>
> Thanks,
>
> Bram
>
>
> --
> ------------------------------------------------------------------------------
> Bram Stolk, VR Specialist.
> SARA Academic Computing Services Amsterdam, PO Box 94613, 1090 GP AMSTERDAM
> email: bram++at++sara.nl Phone +31-20-5923059 Fax +31-20-6683167
>
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> "Thats nothing, if you play it forward, it installs NT-4.0"
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-- 
\_________  \_____  \__    \__  \_____        
\_________  \_____   \__   \__  \_____         Yair Kurzion
       \__     \__   \____\__      \__         yair++at++sgi.com
       \__          \__  \__                  (650) 933-6502
       \__          \__   \__          
       \__          \__    \__

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