Error effect when rendering the same ImageMobject

[floatwoozy]

Motivation

Triggered when rendering the same texture consecutively.
Mobject default render mode is TRIANGLE_STRIP, which will outputs extra triangles;
Use TRIANGLES mode and add vertices to fix this.

Proposed changes

• image_mobject.py

Test

Code:

class Test(Scene):
    def construct(self):
        image = ImageMobject("res/bili.png").scale(0.2)
        a = Group(*[image.copy() for _ in range(25)]).arrange_in_grid(5, 5)
        self.add(a)

Result: