Python OpenGL_多边形仅在顺时针绘制时有效?
我是OpenGL新手,我尝试使用以下代码(GL_多边形)使用python绘制一个圆。但它似乎只在以顺时针方式添加点时才绘制,否则,它什么也不绘制 这成功地画出了一个圆Python OpenGL_多边形仅在顺时针绘制时有效?,python,opengl,Python,Opengl,我是OpenGL新手,我尝试使用以下代码(GL_多边形)使用python绘制一个圆。但它似乎只在以顺时针方式添加点时才绘制,否则,它什么也不绘制 这成功地画出了一个圆 p = self.pos + Y_VEC * self.height # center of the circle dv = self.dir_vec * self.radius # vector point forward rv = self.right_vec * self.radius # vector point t
p = self.pos + Y_VEC * self.height # center of the circle
dv = self.dir_vec * self.radius # vector point forward
rv = self.right_vec * self.radius # vector point to right
sides = 20 # sides of the circle (circle is in fact polygon)
angle = 0
inc = 2 * math.pi / sides
glColor3f(0, 1, 0)
glPointSize(10.0)
glBegin(GL_POLYGON) # GL_POLYGON drawn but not shown in top view? GL_LINE_LOOP works
# glVertex3f(*p) # used for TRIANGLE_FAN
for i in range(sides+1):
pc = p + dv * math.cos(angle) + rv * math.sin(angle)
glVertex3f(*pc)
angle -= inc
glEnd()
未呈现任何内容(仅更改为“-=”到“+=”)
这正常吗?我做错了什么?确保使用
glDisable(GL\u CULL\u FACE)
禁用了此功能,非常感谢,以前从未知道此功能,我花了2天时间才找到答案
angle = 0
inc = 2 * math.pi / sides
glColor3f(0, 1, 0)
glPointSize(10.0)
glBegin(GL_POLYGON) # GL_POLYGON drawn but not shown in top view? GL_LINE_LOOP works
# glVertex3f(*p) # used for TRIANGLE_FAN
for i in range(sides+1):
pc = p + dv * math.cos(angle) + rv * math.sin(angle)
glVertex3f(*pc)
angle += inc # change here
glEnd()