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ShapeElementList only supports 170 num_segments？ Too little #2794
Description
Problem
ShapeElementList, as an efficient method for drawing batches, only supports 170 num_segments, which is too few or there may be some bugs.
Source code example
This is the official code for create_ellipse_filled, num_segments is a important argument, no problem.
def create_ellipse_filled(
center_x: float,
center_y: float,
width: float,
height: float,
color: RGBA255,
tilt_angle: float = 0,
num_segments: int = 128,
) -> Shape:
Args:
center_x: X position of the center of the ellipse
center_y: Y position of the center of the ellipse
width: Width of the ellipse
height: Height of the ellipse
color: A color such as a :py:class:`~arcade.types.Color`
tilt_angle: Angle to tilt the ellipse
num_segments: Number of segments to use to draw the ellipse
Problem occurred
But, if num_segments>170, ShapeElementList (ellipse_list) will disappear, ShapeElementList.draw() will draw nothing
As shown in the following code：
ellipse_list = ShapeElementList()
ellipse = create_ellipse_filled(0, 0, 500, 500, arcade.color.SPANISH_VIOLET, 0, num_segments=170)
ellipse_list.append(ellipse)
ellipse_list.draw() # if num_segments>170, ShapeElementList will disappear
Analyze
Repeated experiments have yielded the number 170, which is a very strange number. This should be a bug, theoretically ShapeElementList should accommodate a much larger quantity of num_segments than this 170.
Activity
Harry-LDH commentedon Mar 27, 2026
When I tested
create_ellipse_filled(400, 300, 200, 200, arcade.color.BLUE, num_segments=171)it drew the shape. I also triedcreate_ellipse_filled(400, 300, 200, 200, arcade.color.BLUE, num_segments=1000)for extra verification. There was no problem. It might have been fixed during an update or a rewrite. So this is no longer an issue.pvcraven commentedon Oct 8, 2026
Closing as can't reproduce: on current development, ellipses with 128, 170, 171, 200 and 1000 segments in a
ShapeElementListall draw correctly. Please reopen with details if it still happens for you.