Tristam-
thanks for the reply. I am just going to avoid using batches for now
since anyway i can't figure how to selectively transform a single item
in a batch (containing many items) using glrotate, gltranslate etc.
but i am curious what you meant by index lines?
On Dec 3, 7:01 pm, Tristam MacDonald <[EMAIL PROTECTED]> wrote:
> On Dec 3, 2008, at 5:03 AM, Vaibhav.bhawsar
>
>
>
> <[EMAIL PROTECTED]> wrote:
>
> > Hi there,
> > i am drawing a circle using GL_LINE_STRIP in this function. i am not
> > sure if this is how create degenerate vertices are added. because two
> > successive calls to this circle function draws two connected circles!?
> > Thanks in advance for any help.
>
> > #these are the two calls to the circle function. why do i see two
> > connected circles?
> > self.circle(100,100,0., 40, 5,self.batch)
> > self.circle(100,100,20., 140, 5,self.batch)
>
> > def circle(self,x,y,z,radius,npoints,batch):
> > data = []
> > angle = 0.0
> > circlesections = 2 * math.pi / (npoints)
> > for i in range(0,npoints):
> > xx = math.cos(angle) * radius
> > yy = math.sin(angle) * radius
> > if i==0:#add the first vertex twice- degenerate vertices
> > data.extend([xx,yy,z])
> > data.extend([xx,yy,z])
> > angle += circlesections
> > data.extend([xx,yy,z])#add the last vertex again- degenerate
> > vertices
> > #data[] now contains [A,A,B,C,D...n,n]
> > return batch.add((npoints+2), GL_LINE_STRIP, None,
> > ('v3f',data)
> > )
>
> I don't see any replied here, so the short answer is that you can't -
> unlike triangles, there are no degenerate lines.
>
> If you are lucky, you might have a vendor specific extension that
> allows you to insert breaks, otherwise use multiple batches
> (potentially slow), or switch to index lines (should be as fast as
> strips these days).
>
> - Tristam
>
>
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