def activate(t: ti.f32):
for i, j in ti.ndrange(n, n):
p = ti.Vector([i, j]) / n
p = ti.Matrix.rotation2d(ti.sin(t)) @ (p - 0.5) + 0.5
if ti.taichi_logo(p) == 0:
x[i, j] = 1
def init():
for i, j in v:
v[i, j] = ti.Vector([j / n - 0.5, 0.5 - i / n])
for i, j in ti.ndrange(n * 4, n * 4):
ret = ti.taichi_logo(ti.Vector([i, j]) / (n * 4))
x[i // 4, j // 4][0] += ret / 16
x[i // 4, j // 4][1] += ret / 16
x[i // 4, j // 4][2] += ret / 16
def paint():
for i, j in ti.ndrange(n * 4, n * 4):
# 4x4 super sampling:
ret = ti.taichi_logo(ti.Vector([i, j]) / (n * 4))
x[i // 4, j // 4] += ret / 16