1.?

效果如下：

float offset = fit01(rand(@ptnum+654),0.5,1)*@Time*chf("speed") + rand(@ptnum+547);int num = nprimitives(1);
vector pos = primuv(1,"P",@ptnum%num,offset%1);@P = pos;

2.

效果如下：?

?

float min = detail(1,"min");
float max = detail(1,"max");@`chs("name")` = fit(@`chs("name")`,min,max,0,1);

int num = nprimitives(1);
int prim = @ptnum%num;
float length = fit01(prim(1,"restlength",prim),0,0.7);float offset = fit01(rand(@ptnum+654),0.5,1)*@Time*chf("speed")*(1-length) + rand(@ptnum+547);
vector pos = primuv(1,"P",@ptnum%num,offset%1);@P = pos;