comp.lang.idl-pvwave archive: archive » Re: Transparent texture mapped polygons

Home » Public Forums » archive » Re: Transparent texture mapped polygons

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Transparent texture mapped polygons [message #29962 is a reply to message #29875]

Tue, 26 March 2002 08:09

Karl Schultz
Messages: 341
Registered: October 1999

Senior Member

"David Fanning" <david@dfanning.com> wrote in message
news:MPG.170979cae136002198984b@news.frii.com...
> Rick Towler (rtowler@u.washington.edu) writes:
>
>> Yes, objects in a view are rendered according to their order in the view
>> container. When texturing with an alpha channel the order of rendering
>> becomes important. Add items from back to front like you first tried.
I
>> see that you are sharing the same verticies between your billboards. I
am
>> not sure how IDL will handle rendering this since your planes occupy the
>> same z space but I think this is your problem. Push your background
plane
>> back a little in z.
>
> I think having coincident polygons is the problem, too.
> I've modified my Image_Blend program so that the images
> rotate on polygons. You can have a look if you are
> interested.
>
> ftp://ftp.dfanning.com/pub/dfanning/outgoing/misc/image_blen d_poly.pro
>

Yes, I agree about the coincident polygons.

Another approach that may be interesting to try is to use the DEPTH_OFFSET
keyword that was added in 5.5. This feature is intended to help solve
Z-buffer "stitching" and interference problems in situations like these. It
has the advantage of applying the depth offset in view coordinates, so you
don't have to tweak the objects' locations as you spin them around with a
trackball in order to keep the "back" polygon in the back. Just add
DEPTH_OFFSET=1 to your "back" polygon.

Karl

Report message to a moderator

[Message index]

		Re: Transparent texture mapped polygons By: David Fanning on Mon, 25 March 2002 17:16
		Re: Transparent texture mapped polygons By: Rick Towler on Mon, 25 March 2002 12:24
		Re: Transparent texture mapped polygons By: lyubo on Mon, 25 March 2002 10:15
		Re: Transparent texture mapped polygons By: Rick Towler on Sun, 24 March 2002 20:59
		Re: Transparent texture mapped polygons By: Karl Schultz on Tue, 26 March 2002 08:09

Previous Topic:	updating a different widget from the event handler
Next Topic:	color labrynth

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Oct 12 08:52:34 PDT 2025

Total time taken to generate the page: 0.24224 seconds