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thanks KarlRichter, sorry too my late. in simply case, your way is very good. but my project is more complex scene by particle, and needs flexible motion. --- Maybe this is the way to go. Calculate the value of the animation curve for each frame. (AF) Add that value by the number of frames. (SumA) Calculate the length of the first and last positions. (SumB) Divide sumB by sumA. (C) The distance to go for each frame is C * aF I will try a little more. thanks!

hi, i want to move particles, from start position to goal position. *)goto_smooth_v001.003_mix.hipnc in POP_Net, the vop network "goto" is built with "Mix" operator, and "bias" is specify by parameter animation. animation 24f=0, 72f=1.0, thus 2 seconds animation. i want that moving slowly at around 24f, reach max speed in middle, slow down in end position at around 72f. but the particles reach around 48f, not follow animation curve that i created. this is same in ramp curve. how controlling particle speed by mix animation curve? *)goto_smooth_v001.002_ramp.hipnc (the best is ramp curve.) thanks. goto_smooth_v001.002_ramp.hipnc goto_smooth_v001.003_mix.hipnc

hi guys. here is my Rough question. VEX in wrangle, and HScript in Parameters, they are tangled. How can i understand their confusion. i have programming techniques in tool development in 3dsmax and Python, some programming language, and so on. but HScript and VEX , their confusion brings very harder jobs. At first, How can these be organized and understood? $NPT[HScript] <-> @numpt[VEX] `npoints(0)-1` [HScript] , back quote `*` ...!? i'm happy if i can get your advice. thanks.

thanks, it's good reference contents.

thanks for my basic quenstion, vicvvsh. i learned a lot. great!

hi, I create test scene, Random timeshift on the points. I have read some tutorials, "CopyStampSOP" and timeshift. "CopyStampSOP" version is good well. similar SOP "copyToPointsSOP", it's fail. What expression should I write for timeshift? thanks Time_Shift_Random_v002.hipnc

thanks jeremiah. i have wanted to just it! this problem was solved.

Thank you as always. i want　to keep group at first frame. first stream, the points are moving.(A) second stream , set attribute by expression at first frame.(B) using attribute transfer sop, transfer B to A. in my text scene, overwrite group on after frames. Is this method something wrong? thank. Keep_Group_v000.001.hipnc Keep_Group_v000.001.hipnc

thanks! i understood the cause for this problem with your advice. i just use "pop_wind" in my network. i have applyed group option into "POP_Wind",only affect first stream. [^stream_frst] i made simple example fix this problem. POP_VOP_Acceleration_v001.001.hipnc

hi controlling particles by POP_VPO, subtruct v1 v2 multiply with float input vector into "v" geometry_vop_global. i want to accelerate the particles speed. multiply 0.1, the particles will be slow, multiply 1.0, the particles will be speedup little bit. multiply 10000, the particles will be speedup only a little. whats wrong? i hope linear acceleration effect to particles. particles has limitation speed any parameters? POP speed limit does not used. thanks.

hi, POP_Stream creates other stream by expression. but the rotation is changed in one frame.(at 48f) the attachment file,this is simple scene. the particles go to from Outer Tube goto Inner tube at 48f. ”goto” stream with VOP. How can I make a smooth transition? thanks. POP_Smooth_Transition_v001.001.hipnc

hi, Disable, Hide option is very easy, and useful. by the way, I want to set expression value into 'String'(FilePath) Parameter as default by value of other 'OrderMenu'(Category). how to set expression ? thanks.

the problem with VRay version 3.6.04, ver.3.6.03 shows vray_velocity_element with no problems. Motion_blur(3d blur) has same problmes. thanks

hi, Export pyro sim with vdb, input vdb into VRay_VolumeGrid on 3dsMax, 3rd party chennel mapping smome=dencity, temperture=temperture, each velocity = vel, the grid show velocity wit purple marker. but the vray rendering image is empty VRay_Velocity Elements(strength Zero). VRay_Volume_Grid is sat "Volumetric_Geometry" mode.(need geometric vray render elments) whats wrong my setting? Vray 3.6.04 (3dsMax2017) Houdini 17.5

hi, the particle shape from other DCC tool with alembic file format, the alembic do not have velocity data. particles count changed frame by frame (has life-span, are delete by age), connectivity class id is changed frame by frame, thus, i cannot track the velocity. Alembic(delay_load?) -> Connectivity ->Trail(recompute_velocity) do you have any way fo this case? thanks