houdini 粒子拖尾

1.trail 

Connect as polygons

Trail Length $FEND

close Rows

 

2.pop replicate

popwrangle : i@orign = @id;

pop replicate : birth 1,1,1,0,0, shape point; attributes 

delete :stream_source_first_input1

add ->polygon attribute :orign

 

3.

pcopen cross

blur volume 沿表面攀爬

volume trail 的影响因素 长短 圆滑度，量  无@N 无 scatter 量太少 ，3