Re: How to realize missile trail?

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Brett Chladny (chladny++at++atlanta.sgi.com)
Wed, 14 Apr 1999 14:29:53 -0400

I have a couple of suggestions to extend the below solution. First,
keep a set number of polygons per trail and cycle them from the end of
the trail back to the beginning. This way you are continuously altering
DCS's, and not creating or destroying geosets while running the
application. If you want to be very efficient in the app, all missiles
could share the same goesets. I would also add texture to the
polygons. The texture should be a sequence of images. I would make 36
images from red fire to puffy smoke. Put them into one texture (6 x
6). This is important because you want to alter the texture coordinates
of the geoset, not change the texture for each polygon. If you have not
over loaded your draw yet, make all the polygons face the viewer
(billboard). If this is too much for the draw, remove the DCS's and
bill boarding, compute all vertex coordinates in the app. Add some
random-ness to almost every part of the code, and you should have great
looking trails.

Brett

Brickley, Jeff wrote:
>
> You might try a trail of polygons slowly expanding behind
> the aircraft. You would have to keep the history
> information. By decreasing the Alpha values as the trail
> gets farther from the aircraft, the trail can slowly
> disappear. The problem you will face is finding a mid-point
> between realism (taking every point in the history) and
> having to reduce the polygons that weigh your simulation
> down. Alternately both Multigen-Paradigm's Vega and
> Centric's (previously Coryphaeus) EasyScene already does
> this for you with add-on products.
>
> Jeffry J. Brickley <jbrickley++at++programmer.net>
> SRS Information Systems
> White Sands Missile Range, NM 88002
>
> -----Original Message-----
> From: ns.dept3.buaa.edu.cn [mailto:baofyu++at++ns.dept3.buaa.edu.
> cn]
> Sent: Monday, April 13, 1998 7:30 PM
> To: info-performer++at++sgi.com
> Subject: How to realize missile trail?
>
> Hi! Everyone:
> I am using Performer2.2 pfuSmoke API
> pfuSmokeType(smoke,PFUSMOKE_MISSILE)
> to realize missile trail,but the resault is
> disappointmenting! It doesn't
> like some missile trail,just like some small fire.
> How should I do? Should I use some other Texture?
> Yu
>
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