mranosa Posted August 31, 2016 Share Posted August 31, 2016 Hi guys I have tried a lot to reach the boat wake by using collisions or velocity geometry ! Does anyone have a good idea for this ?(maybe some example file with some model or a hull!) Thanks ! Quote Link to comment Share on other sites More sharing options...
tamagochy Posted September 1, 2016 Share Posted September 1, 2016 Add custom velocity to flip fluid at the nose of the ship. Its match more easy then collisions and not depend from the speed. Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 1, 2016 Author Share Posted September 1, 2016 3 hours ago, tamagochy said: Add custom velocity to flip fluid at the nose of the ship. Its match more easy then collisions and not depend from the speed. can u give me a good example file because i tried this and failed ? Quote Link to comment Share on other sites More sharing options...
rbowden Posted September 1, 2016 Share Posted September 1, 2016 You should post your failed file so all of us could look at it and tell you what is wrong. That way you can learn from any mistakes you may have made. Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 2, 2016 Author Share Posted September 2, 2016 Ok I did a sim with collisions and tried to play with a lot of stuff to make it better and with 6 million particles ! I did it with some volume collision this is the sim https://drive.google.com/open?id=0B8x1Z3zgTaL7bW5DOHNlOWpyM2s it looks crazy somehow ,especially, when u try to do something like this by graham these are the hip file and the model used https://drive.google.com/open?id=0B8x1Z3zgTaL7WU4wWHA4NEJPa1kvv sorry for being late and i hope someone help me :'( 1 Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 2, 2016 Author Share Posted September 2, 2016 Here is my try with the pump geometry and it looks so bad http://m.youtube.com/watch?v=eEScsFq0qpo Quote Link to comment Share on other sites More sharing options...
rbowden Posted September 2, 2016 Share Posted September 2, 2016 http://archive.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=171998 In that post, Jeff Wagner posted a setup that uses the same technique as Grahams video. Not even going to bother explaining everything because Jeff always puts sticky notes in his files explaining everything. Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 2, 2016 Author Share Posted September 2, 2016 (edited) I have downloaded his file and animated the grid pump and i had the result i posted above which is this I didn't like this result at all ! Edited September 2, 2016 by mranosa Quote Link to comment Share on other sites More sharing options...
rbowden Posted September 2, 2016 Share Posted September 2, 2016 I am not sure what you are expecting? it looks like the animated pump is doing its job and creating the wake from the bow of the boat. Are you wanting more of a wave? More splash? You are not limited to using the same geometry as in jeffs file. You can make your own and edit it how you want to. The great thing about Grahams videos is that he does solver settings that accompany his RnD. Look at those videos and see how the wave is influenced by changing certain parameters.https://vimeo.com/68531266 Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 2, 2016 Author Share Posted September 2, 2016 no , i have changed and tried a lot but there is a big difference between the video of graham and mine ! my try has a big wide wave which makes the foam very bad ! look at graham's video and compare them ! the difference is so big ! Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 2, 2016 Author Share Posted September 2, 2016 another try with collisions like graham's one "Flip Solver Settings" https://drive.google.com/file/d/0B8x1Z3zgTaL7RFQwSE5tdHVkN28/view?usp=sharing Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 5, 2016 Author Share Posted September 5, 2016 I am really disappointed that noone helps me at all :(((( I want to acheive something better but it seems there is no chance I watched this video and i can't do anything more to reach this effect at all ! it seems like a secret or something very private !!! i don't know what are the GVS and Oversampling parameters and i can't have a collision otr effect like this please please i am very disappointed and about to leave everything 1 Quote Link to comment Share on other sites More sharing options...
eetu Posted September 5, 2016 Share Posted September 5, 2016 Your tests seem to be of significantly lower particle resolution than the references, that might also be a factor? Quote Link to comment Share on other sites More sharing options...
Atom Posted September 5, 2016 Share Posted September 5, 2016 (edited) Here is my attempt at the effect. The particle separation is fairly high so the results are coarse. Feel free to lower the particle separation and re-sim. I have not included any whitewater, you can add that on top once you settle on a final particle separation. I have installed the pump, as best to my ability, following the instructions in the Jeff Wagner "flip_pump_bow_curl" hip file from the above link. I have enabled OpenCL on the solver to increase calculation speed. If you experience crashing try turning that off in the solver. I have linked the Division Size of the ship hull volume directly to the Particle Separation of the Flip tank to keep things balanced but as you drop the Particle Separation you may want to de-couple these two parameters as you may not need that much resolution on the hull volume. You could also just Clip off the top half of the boat, unless you expect waves to roll over top. I think eetu is right about the resolution. You really have to lower the particle separation get hi-quality results. ap_large_ship_wake_with_pump_1a.hipnc Edited September 5, 2016 by Atom 1 1 Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 5, 2016 Author Share Posted September 5, 2016 I will try the file I made the resolution up to 18 million and the same result so will try and give u a reply ! Thanks Quote Link to comment Share on other sites More sharing options...
Atom Posted September 5, 2016 Share Posted September 5, 2016 I was playing with Jeff Wagner's file and it might be a better solution. I have added in some movement and extended the grid pump for a longer hull. ap_jw_flip_pump_bow_curl.hiplc 3 1 Quote Link to comment Share on other sites More sharing options...
Atom Posted September 5, 2016 Share Posted September 5, 2016 (edited) Here is an integration attempt with the Jeff Wagner's pump geometry fitted to the hull of the ship. I did a little more shaping of the bent grid to conform to the ship hull better. I kind of toned down the amount of velocity that the pumps send out along those curved guides to emulate the larger scale of the ship. After all the ship is supposed to be very large. The ship model at a scale of 1.0 seems to be real world units, however, when I tried to scale up the simulation to match the ship it failed to work correctly. So in this example scene I have scaled the ship down to fit the size of the working pump. This goes against most suggestions that you work at real world units with flip but hey this is just for fun. And this technique of using curved pumps is fun to mess around with. I could see this being used for any kind of geometry that you want to skim across a fluid surface. Such as a water skier, a jet ski, or even cartoon characters. ap_jw_flip_pump_bow_curl_1a.hiplc Edited September 5, 2016 by Atom 2 1 Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 5, 2016 Author Share Posted September 5, 2016 Nice ! I was trying the first collision solution with high res (40 million ) It was the same as my one and i can tweak it more to look better , but yeah i think i will see Jeff's solution and compare them ! Thanks Again , i will send a reply with the result ! Quote Link to comment Share on other sites More sharing options...
mranosa Posted September 6, 2016 Author Share Posted September 6, 2016 I tried ur file there is something lost ! The wake doesn't look really well like any video ! it is a punch of noise and the wave is not going backward in good way .I tried jeff's scene as he did as well and i don't know how to get a wave like the videos i shared with this it always looks hell and nothing fancy happens although i have tried a lot with many number of particles and everything looks so bad (Not production stuff or even good looking) Quote Link to comment Share on other sites More sharing options...
Atom Posted September 6, 2016 Share Posted September 6, 2016 (edited) That is the thing with FLIP, half of the magic is in the materials. Have tried reaching out to Vladimir or Graham on Vimeo? Maybe they can give you some tips...? I also wondered if the trailing wake is actually caused by spinning propellers. It might be a dual effect you are seeing in those videos. You could try separating the propellers from the ship, making them rotate and turning them into Static objects. Then in the sim make sure the Static object is set to deforming with a good collision volume resolution. Edited September 6, 2016 by Atom Quote Link to comment Share on other sites More sharing options...
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