# allan mckay particle tutorial help

 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy allan mckay particle tutorial help Hi....I watch the allan mckay tutorial about fracture ( http://www.allanmckay.com/index.htm ) but i've a problem...I tried to reproduce this excercises with a simple horizontal plane without problems but....after this i've tried to destroy a statue with this method: the problem is that when the particles (displayed as GEOMETRY) falls down to deflector, they bounce on this deflector not for the geometry but for the particle "volume" extremly smaller than pieces of geometry obviously creating some interpretations between visualized geometry and the deflector.... how I can do? please help me....... thanks a lot __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 superhypersam Fear the Ape   sam Khorshid VFX supervisor Phenom Films los angeles, USA Its a current limit of Pflow, only the center point respects collisions. There is a solution using box 3 and offsets, but its not ideal. U can also bake out your parts uisng a script, then shoot it threw reactor, but its a bit of a process. Thinking Particles is great for this sort of thing, but is complex. heh lots of work eithier way. cheers __________________ sam k GiantApeStudios share quote
 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy oh no....ok.....so you think that thinking particle could help me? is it so hard to understand and use? thanks a lot __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 BrandonD Infidel   Brandon Davis Voxel Bee-otch Dogtown, USA This is problem long common to all particle systems in packages. The problem stems from the simple fact that particles aren't really objects, just infinitely small points in 3d space. It's relatively easy to apply a collision to a point in space with velocity. The thing is that when we work with particles, we're often instancing geometry to their locations - so in other words, on a frame by frame basis the 3d app is snapping objects to the location of particles, hence the transform matrix of the particles drive the geometry. In this way the particle takes the place of the geometry's pivot point. Incidentally, this is why in Particle Flow you can't spawn from instanced geometry - just particle locations. For the instanced geometry applied to particles to affect the particle motion you need some kind of integrated rigid body dynamics solver. This is something Thinking Particles added, if I remember correctly. It's a potentially difficult problem to solve and, at least in the past, we've done all kinds of tricks to avoid it. __________________ -Brandon Davis share quote
 03 March 2007 superhypersam Fear the Ape   sam Khorshid VFX supervisor Phenom Films los angeles, USA what Brandon sez! Tp has a great built in solution, its the shape collision solver. does a great job on rigid body stuff, and has the added benefit of of it bin connected directly with the particle system. IMHO the best soulution for rigid body stuff in max The downfall is Tp pretty complex, but the task is a complex one. they do provide a tutorial that covers the subject, but its not great on explaining settings. cheers __________________ sam k GiantApeStudios share quote
 03 March 2007 PiXeL_MoNKeY Expert   Eric Craft Dallas, USA This is one of the features that should be a part of PFToolbox #2, however there is no stated release date for it. I am sure you could hack something up in Toolbox #3 or I am sure Oleg could throw something together to get a basic working version. You have to remember that PFlow doesn't even have inter particle collision as part of the shipping package. -Eric __________________ "The Evil Monkey hiding in your closet." share quote
 03 March 2007 superhypersam Fear the Ape   sam Khorshid VFX supervisor Phenom Films los angeles, USA yes there is a box 3 solution that invloves calculating the parts offset distance, but not very elegant, and a lil hard to control. Box 2 should be great, but like u said, not there yet. __________________ sam k GiantApeStudios share quote
 03 March 2007 CapitanRed Capitan P-) portfolio Goran Pavles FX Artist/TD pavlesVFX Switzerland Mistral, if you want to spend the money for Thinking Particles, then do it!! it's great, and not very difficlt to understand. it's just different to Pflow. there is also a TP-Forum: http://www.3dplanet.de/cgfluids/ __________________ Goran __________________ pavlesVFX share quote
 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy ok: @brandonD: Yes I know that the particles are extremly small points in 3d space but snapping 3d fragments on particle in this case it seems too long and difficult cos in my scene there are about 1600 fragments....so....you know....it's so complicated.... @superhypersam: I tried to use rigid bodies and fracture (included in reactor features) but the fragments are too near and so during the simulation it crashes also modifing the collision tollerance... @PiXeL_MoNKeY: If I well remember I've seen your discussion on oleg forum about a script that create line from particles movement...is it right? do you think that with Toolbox #3 could help me?I've just Toolbox #2.... @CapitanRed: I tried Thinking Particles just a day ago but the results are quite similar to pArray results...also pArray could fracture object but the fragments are not so realistic...similar to thinking particle results (I've downloaded a fragment tutorial from cebas website) __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 CapitanRed Capitan P-) portfolio Goran Pavles FX Artist/TD pavlesVFX Switzerland well...nobody said one day will be enough to understand and find out the possibilities of TP. keep on rying but it gives you enough controle over fragmenting and shape based collisions. watch the bullettimevideo on "my site" it is done with fragment operator, which is controled with a alpha map and an omni. the bullet is pushing the fragments away(collision shape operator) this is just an example. there is much more, which i havent explored yet __________________ Goran __________________ pavlesVFX share quote
 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy ok....thanks a lot....i'll see the video immediatly... stay tuned __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy i've seen the bullet video and i noted that the pieces are too regular and quite artificial...while with a script (found in internet) i could fragment a mesh in a clearly realistic way...the fragments are irregular and seems real...but otherwise I've the same problem with particle volume...:( thanks a lot at all __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 supremepizza 3Dude/Goin with the PFlow   portfolio William (Bill) Rickert Web Master Freelance Granite City, USA .......oops! Last edited by supremepizza : 03 March 2007 at 09:36 PM. share quote
 03 March 2007 mistral Veteran   portfolio Fabio Universitary student AristoGRAPHICS Rome, Italy ooops????????? __________________ ...now in... FrameByFrame [showreel 2009] (personal) _____________________ .:blowing in the wind:. .::ddd::. share quote
 03 March 2007 Digital Masta New Member Brandon Perry Japan Instead of making yet another thread on it, I figured I post it in here... I'm having some issues with another tutorial, its the one where the ball dissolves to become the teapot. My issue is when I turn the Find Target's point to "by script vector" it doesn't do anything. Clearly it has to be the script but since I don't really have much script experience at all and the script isn't error'ing out on me when I close the script I'm not sure what to look for. It's also hard to see the script from the video tutorial and there is no max file to look at either. Would anyone happen to know whats wrong with my script OR know what the script is supposed to look like so I could compare it with mine Here is an image of a piece of the script http://i35.photobucket.com/albums/d...asta/script.jpg share quote

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