struct-for-cannot-be-nested-inside-a-kernel

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struct_for cannot be nested inside a kernel

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        if self.lift_up_is_on[None] == 1:
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            lift_up = ti.Vector([0.0, 50.0, 0.0])
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            for k in self.TO_LIFT: # this is a ti.ndarray
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                i = self.TO_LIFT[k]
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                self.v_soft[i][1] = max(0, self.v_soft[i][1])
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                self.v_soft[i] += lift_up * self.dt
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                self.highlight_vertex(i)

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        if self.lift_up_is_on[None] == 1:
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            lift_up = ti.Vector([0.0, 50.0, 0.0])
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            for k in range(self.TO_LIFT.shape[0]):
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                i = self.TO_LIFT[k]
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                self.v_soft[i][1] = max(0, self.v_soft[i][1])
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                self.v_soft[i] += lift_up * self.dt
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                self.highlight_vertex(i)