It's my understanding that the first, and last vertexes need to be
duplicated. Something about terminating the points. I could be off base
here, since the last time I wrote OpenGL was about 2 years ago with another
framework and likely in modern OpenGL, but give that a look :)
On Tuesday, January 19, 2016 at 10:26:34 AM UTC+9, Pygler wrote:
>
> I am trying to batch draw a bunch of circles using their vertices (using
> below function to generate many circles) instead of using glVertex2f in a
> loop to draw a circle.
>
> class Snowflake(object):
> def __init__(self, x, y, radius, d, batch):
> self.x = x
> self.y = y
> self.r = radius
> self.d = d
> circle = self.create_vertices(x, y, self.r)
> self.vertex_list = batch.add(len(circle[1])//2,
> pyglet.gl.GL_POLYGON, None,
> circle,('c4f',(1, 1, 1, 0.8)*(len(circle[1])//2)))
>
> def create_vertices(self, x, y, radius, sides=24):
> vertices = []
> for i in range(sides):
> angle = math.radians(float(i)/sides * 360.0)
> x1 = radius*math.cos(angle) + x
> y1 = radius*math.sin(angle) + y
> vertices += [x1,y1]
>
>
> return ('v2f', vertices)
>
>
> However, upon doing this and running batch.draw(), it links each polygon
> together from where the last vertice is in each vertex list to the start of
> the next. Is it not possible to batch polygons and separate them like this
> or is there something I am missing? Sorry if this is a stupid question.
> Thanks for any help.
>
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