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)
)
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