Comments on: Retiming ICE caches http://www.andynicholas.com/?p=362 Just another WordPress weblog Wed, 01 Sep 2010 21:01:07 +0100 http://wordpress.org/?v=2.8.4 hourly 1 By: Siaamak http://www.andynicholas.com/?p=362&cpage=1#comment-2288 Siaamak Fri, 13 Aug 2010 20:41:18 +0000 http://www.andynicholas.com/?p=362#comment-2288 Thanks.. Nice Thanks.. Nice

]]> By: AndyN http://www.andynicholas.com/?p=362&cpage=1#comment-2050 AndyN Fri, 18 Jun 2010 10:29:48 +0000 http://www.andynicholas.com/?p=362#comment-2050 Thanks Sebastian! Thanks Sebastian!

]]> By: sebastian http://www.andynicholas.com/?p=362&cpage=1#comment-2049 sebastian Fri, 18 Jun 2010 09:47:30 +0000 http://www.andynicholas.com/?p=362#comment-2049 this simply works like a charm. thanks andy this simply works like a charm.
thanks andy

]]> By: abacus center http://www.andynicholas.com/?p=362&cpage=1#comment-1938 abacus center Mon, 24 May 2010 09:21:29 +0000 http://www.andynicholas.com/?p=362#comment-1938 An excellent presentation. Clear. Practical. Insightful. Shows a depth of experience. Thank you. I learned a great deal. An excellent presentation. Clear. Practical. Insightful. Shows a depth of experience. Thank you. I learned a great deal.

]]> By: AndyN http://www.andynicholas.com/?p=362&cpage=1#comment-1209 AndyN Fri, 29 Jan 2010 16:05:33 +0000 http://www.andynicholas.com/?p=362#comment-1209 Hi Jasper, Good to hear that you found the tutorial useful. Yep, you're right; the "Get self.pointposition At Previous Frame" is exactly what you said it is. I've recently discovered that there are some issues with this node if you're doing any deletion or cloning of particles, but otherwise it should work okay. It's hard to give advice without seeing your ICE tree and setup. If you want to email me a screen shot, I'll see if I can help. (I'll send you my email address in a sec) Cheers Andy Hi Jasper,
Good to hear that you found the tutorial useful.

Yep, you’re right; the “Get self.pointposition At Previous Frame” is exactly what you said it is. I’ve recently discovered that there are some issues with this node if you’re doing any deletion or cloning of particles, but otherwise it should work okay.

It’s hard to give advice without seeing your ICE tree and setup. If you want to email me a screen shot, I’ll see if I can help. (I’ll send you my email address in a sec)

Cheers

Andy

]]> By: Jasper S http://www.andynicholas.com/?p=362&cpage=1#comment-1208 Jasper S Fri, 29 Jan 2010 15:57:34 +0000 http://www.andynicholas.com/?p=362#comment-1208 Thanks for the tutorial, very well written and explained. Even a complete ICE-noob like me managed to recreate the compound (and learned quite a few things along the way). Like Rob above, my aim was to slow down a simulation, no ramping involved. I took out the fcurve node and replaced it with a 'current frame' followed by a 'multiply' - this seems to work correctly, no jumping around of particles. The only thing I'm having problems with is the motion blur fix - the 'get self.pointposition at previous frame' node. Is it a 'get data at previous frame' node referenced to self.pointposition? I get 0,0,0 value out of that (checked with expose value hack node). I suppose I'm doing something wrong there. (As said, I'm new to ICE, so forgive me if this is too easy to answer) Jasper Thanks for the tutorial, very well written and explained. Even a complete ICE-noob like me managed to recreate the compound (and learned quite a few things along the way).

Like Rob above, my aim was to slow down a simulation, no ramping involved. I took out the fcurve node and replaced it with a ‘current frame’ followed by a ‘multiply’ – this seems to work correctly, no jumping around of particles.

The only thing I’m having problems with is the motion blur fix – the ‘get self.pointposition at previous frame’ node. Is it a ‘get data at previous frame’ node referenced to self.pointposition? I get 0,0,0 value out of that (checked with expose value hack node). I suppose I’m doing something wrong there.

(As said, I’m new to ICE, so forgive me if this is too easy to answer)

Jasper

]]> By: Rob Chapman http://www.andynicholas.com/?p=362&cpage=1#comment-647 Rob Chapman Thu, 05 Nov 2009 10:27:33 +0000 http://www.andynicholas.com/?p=362#comment-647 Aha yes you are right. setting a different speed other than 0.5 makes the cache playback all over the place. oh well I'll just resim at 50fps and keep the compound for speed ramps which im positive will be needed in the future :D many thanks for your time. Rob Aha yes you are right. setting a different speed other than 0.5 makes the cache playback all over the place. oh well I’ll just resim at 50fps and keep the compound for speed ramps which im positive will be needed in the future :D

many thanks for your time.

Rob

]]> By: AndyN http://www.andynicholas.com/?p=362&cpage=1#comment-645 AndyN Wed, 04 Nov 2009 23:36:24 +0000 http://www.andynicholas.com/?p=362#comment-645 Hi Rob, You shouldn't need to swap the floor and ceiling nodes. By my reckoning, it'll make the particles interpolate the wrong way round as it goes between the surrounding frames. You know... thinking about it, the fact that you've slowed it down by a factor of 2 means that you won't notice this happening, as you're only ever seeing it half way through the interpolation (at t=0.5 it doesn't matter which way round you get there). If you try slowing it down by a factor of 10, I'm pretty certain you'll see the particles interpolating backwards and jumping around as a result. In fact, this is exactly what the Mixer does at the moment, which is the bug I mentioned on page 2. Let me know if this is what happens with your setup. Anyway, I'm glad you found the tutorial useful. Thanks for the comment. Cheers, Andy Hi Rob,

You shouldn’t need to swap the floor and ceiling nodes. By my reckoning, it’ll make the particles interpolate the wrong way round as it goes between the surrounding frames. You know… thinking about it, the fact that you’ve slowed it down by a factor of 2 means that you won’t notice this happening, as you’re only ever seeing it half way through the interpolation (at t=0.5 it doesn’t matter which way round you get there).

If you try slowing it down by a factor of 10, I’m pretty certain you’ll see the particles interpolating backwards and jumping around as a result. In fact, this is exactly what the Mixer does at the moment, which is the bug I mentioned on page 2. Let me know if this is what happens with your setup.

Anyway, I’m glad you found the tutorial useful. Thanks for the comment.

Cheers,

Andy

]]> By: Rob Chapman http://www.andynicholas.com/?p=362&cpage=1#comment-644 Rob Chapman Wed, 04 Nov 2009 17:57:34 +0000 http://www.andynicholas.com/?p=362#comment-644 Hi Andy , Great Tutorial & very informative. I was going through this because I wanted to slow down an existing simulation by half which was captured at 25fps without having to resimulate at 50fps I think ive got it working by plugging the current frame into the warp fcurve input and adjust the fcurve so that the value say at frame 150 = 75 AND Swapping the ceiling & floor around in the 'Retime Particle A' compound. what you recon? am I flawed in thinking this works? it looks ok so far :) thanks again Hi Andy , Great Tutorial & very informative. I was going through this because I wanted to slow down an existing simulation by half which was captured at 25fps without having to resimulate at 50fps

I think ive got it working by plugging the current frame into the warp fcurve input and adjust the fcurve so that the value say at frame 150 = 75 AND Swapping the ceiling & floor around in the ‘Retime Particle A’ compound. what you recon? am I flawed in thinking this works? it looks ok so far :)

thanks again

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