Re: Question about Draw callback

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Jean-Luc Dery (dery++at++discreet.com)
Fri, 18 Dec 1998 10:01:17 -0500

On Dec 17, 1:29pm, Angus Dorbie wrote:
> Subject: Re: Question about Draw callback
> Eddy Kuo wrote:
> > 2)
> > When I have a channel draw callback, and a node traversal draw callback,
> > What is the order of these callbacks being called. (in a multiprocessors
> > environment)
>
> The channel draw callback calls pfDraw. In pfDraw, when the node is
> reached
> in the display list your node draw callbacks will be called before and
> after
> it is drawn.

Careful with pfChannel PFCULL_SORT mode; the node draw callbacks might not get
called as you expect. If draw callbacks are set at pfNode levels, they might
affect geometry node children from other groups since those are sorted
according to graphics state optimisation.

Jean-Luc

-- 
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Jean-Luc Dery                         Discreet Logic
Technical Leader                      10 Duke Street
3-D Graphics Technology and           Montreal (Quebec), Canada, H3C 2L7
Realtime Systems                      Tel: (514) 954-7239
Email: jean-lucD++at++discreet.com         Fax: (514) 393-0110
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