ring explosion

Edwart · Post by **Edwart** » Sat Jan 14, 2006 12:14 pm

hi,

i created a few explosions with the IParticleSystemSceneNode but i have no idea how to create a ring-explosion.
the ring should get bigger.
like an explosion of a spaceship in the space.

i have no idea how to create it.
can you help me please?

Thank You
Edwart

dhenton9000 · Post by **dhenton9000** » Sat Jan 14, 2006 1:36 pm

I have a animated bill board series that I can zip up that has an explosion ring, available as a sequence of 48 pngs:

If you are interested, send me a PM and I'll put it up on a website.

Pazystamo · Post by **Pazystamo** » Sat Jan 14, 2006 2:01 pm

here is particle coordinates calculation:
x=cos(angle)*radius+xcenter;
z=sin(angle)*radius+zcenter;

xcenter,zcenter is your explosion center.
radius is distance from center.you should add to radius every frame(with timer).
angle(in radians, degree*(PI/180)) is in what direction particle will move,make it random.
It is plane movement,if you want to create sphere explosion add y:
y=sin(angle)*radius+ycenter;
thats all..

Guest · Post by **Guest** » Sat Jan 14, 2006 2:09 pm

hi!

to dhenton:
isnt it more efficient to scale the "explosion ring" bigger in a loop instead of having 48 pictures of an explosion ring where each one is a little bigger? just a suggestion.

bye!

dhenton9000 · Post by **dhenton9000** » Sat Jan 14, 2006 2:32 pm

GFXstyLER wrote:hi!

to dhenton:
isnt it more efficient to scale the "explosion ring" bigger in a loop instead of having 48 pictures of an explosion ring where each one is a little bigger? just a suggestion.

bye!

its only more efficient if you know how to do it, which I don't. I go for cheap. I got the animation off the Blender site, output it as pngs (for transparency) and was blowing things up within 30 minutes.

As they say in the trade, get it fast, get it cheap, get it right, choose 1 of 3.

JP · Post by JP » Sat Jan 14, 2006 3:15 pm

hey dhenton, i'd certainly be interested in peeking at your stuff!

dhenton9000 · Post by **dhenton9000** » Sat Jan 14, 2006 5:04 pm

The animation is at:

http://www.s-fonline.com/webhosting/dhe ... ssdemo.zip

Inside this zip is a folder called assets\explosions. Thats where the images are. If you run the exe you can see it working (sort of things bounce around so you won't get a good look at it)

JP · Post by JP » Sat Jan 14, 2006 7:04 pm

Took a few attempts to download, about 5 times i tried it didnt fully download and ended up corrupt, but got it now, i'll try it out sometime soon, cheers!

Edwart · Post by **Edwart** » Sat Jan 14, 2006 10:49 pm

i cant download the file too.
it breaks after 5 minutes... .

is it possible to upload the specific source-code and the pics of the animation?

dhenton9000 · Post by **dhenton9000** » Sat Jan 14, 2006 11:29 pm

try

http://s-fonline.com/webhosting/dhenton ... xplode.zip

The source is scattered all over the other zip, but its just a texture animator, which should be in the demos.

Guest · Post by **Guest** » Sun Jan 15, 2006 12:31 pm

Pazystamo wrote:here is particle coordinates calculation:
x=cos(angle)*radius+xcenter;
z=sin(angle)*radius+zcenter;

xcenter,zcenter is your explosion center.
radius is distance from center.you should add to radius every frame(with timer).
angle(in radians, degree*(PI/180)) is in what direction particle will move,make it random.
It is plane movement,if you want to create sphere explosion add y:
y=sin(angle)*radius+ycenter;
thats all..

what type of particlescenenode would you use with that? or would you need to put that into a custom scene node to make it work?

thanks

Pazystamo · Post by **Pazystamo** » Sun Jan 15, 2006 12:53 pm

well Guest, i havent work with particles and i havent found how to set individual particle pos. But this code works for bilboards. That was only basicaly formula to find pos when you have angle and distance.

Xaron · Post by **Xaron** » Sun Jan 15, 2006 5:37 pm

I use a ring-mesh for that, which gets scaled.

Regards - Xaron