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Burst Effect?

Started by grasshopa55 Nov 27, 2000 at 10:08 AM 2 replies 200+ views

Original Post

Nov 27, 2000 at 10:08 AM

Hi I want to create an effect similar to the one shown at the following link. I want to be able to have the circle grow until it is too big for the screen as well as have those triangles spin around the center. I know how to do this in 2D (make a sprite and animate), but I want to do this rendered in 3D. Any suggestions http://www.dainteractiveonline.com/burst.jpg Kevin =)

kashey

Nov 28, 2000 at 9:46 AM

lets do it in opengl

initalize it
...
load texture showing circle
...
bind it
write

glBegin(GL_QUADS)
glVertex3f(-size,-size,z);
glVertex3f(-size, size,z);
glVertex3f( size, size,z);
glVertex3f( size,-size,z);
glEnd();

where size is size of circle you wanna
z is z position of effect

next you want lines so
glBegin(GL_LINES)
glVertex3f(0,0,z);
glVertex3f(x*cos(a),x*sin(a),z);
glEnd();

where x is lenght of line and a if angle of rotation

swarpbuffers and go!

do you know how to load/bind texture and initalize ogl????

no??? in that language you wanna it???

grasshopa55

Nov 28, 2000 at 9:52 AM

Thanks for the information

I am pretty well versed in DirectX so that is what I am working in. After I posted the message I realized I had answered my own question. I can draw a circle with an ever expanding diameter with triangles whose point is the center of the circle.

Thanks Again

Kevin =)

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