Comments on: Water simulation in Arcane Worlds https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/?utm_source=rss&utm_medium=rss&utm_campaign=water-simulation-in-arcane-worlds Mon, 13 Oct 2014 19:26:05 +0000 hourly 1 By: Reload https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-218 Reload Mon, 23 Apr 2012 09:01:41 +0000 http://ranmantaru.com/?p=155#comment-218 Hi, thanks to you I did this last month : http://www.youtube.com/watch?v=1hti5VgKZ6s Thanks again! Hi,

thanks to you I did this last month : http://www.youtube.com/watch?v=1hti5VgKZ6s

Thanks again!

]]> By: Loren https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-183 Loren Sun, 22 Apr 2012 07:46:56 +0000 http://ranmantaru.com/?p=155#comment-183 The expertise shines through. Thanks for taking the time to asnewr. The expertise shines through. Thanks for taking the time to asnewr.

]]> By: Water simulation on the GPU | Reload's Blog https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-134 Water simulation on the GPU | Reload's Blog Thu, 22 Mar 2012 12:56:02 +0000 http://ranmantaru.com/?p=155#comment-134 [...] by this anf this, I implemented a water simlation on the GPU. It still a WIP, but here are the first showable [...] [...] by this anf this, I implemented a water simlation on the GPU. It still a WIP, but here are the first showable [...]

]]> By: Reload https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-74 Reload Wed, 29 Feb 2012 11:02:55 +0000 http://ranmantaru.com/?p=155#comment-74 Thanks for the reply! I'm on my way trying to implement this myself! Thanks again for sharing! Thanks for the reply!

I’m on my way trying to implement this myself!

Thanks again for sharing!

]]> By: e-dog https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-73 e-dog Tue, 28 Feb 2012 13:09:26 +0000 http://ranmantaru.com/?p=155#comment-73 The grid is 256x256, just like land heightmap. It's rather small, yeah. But it allows to run complex procedural generation methods in short time, and water simulation doesn't consume too much CPU too. I might increase it to 512 later if performance tests will show it's OK for most people. The foam amount is increased when gravity acceleration is applied, and in special cases like "hitting a wall". It then fades out with time. Yeah, the foam is there to give a feeling of flow. The mapping is randomly shifted and rotated and then advected by flows for a short time. There are two mappings actually, cross-fading continuously because with long advection time a mapping becomes too distorted. The grid is 256×256, just like land heightmap.
It’s rather small, yeah. But it allows to run complex procedural generation methods in short time, and water simulation doesn’t consume too much CPU too.
I might increase it to 512 later if performance tests will show it’s OK for most people.

The foam amount is increased when gravity acceleration is applied, and in special cases like “hitting a wall”. It then fades out with time.
Yeah, the foam is there to give a feeling of flow. The mapping is randomly shifted and rotated and then advected by flows for a short time. There are two mappings actually, cross-fading continuously because with long advection time a mapping becomes too distorted.

]]> By: Reload https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-72 Reload Tue, 28 Feb 2012 10:22:58 +0000 http://ranmantaru.com/?p=155#comment-72 Hi, Thanks for the info! May I ask what's the size of your grid? And what the foam amount is based on and used for? I'd say that the amount of foam is proportionnal to the flow speed and used to help visualize the direction and speed of the flow, but it's pure speculation! How are you mapping the foam texture? Are you just offsetting the UV coordinates by the flow speed x delta time? Hi,

Thanks for the info!

May I ask what’s the size of your grid?
And what the foam amount is based on and used for? I’d say that the amount of foam is proportionnal to the flow speed and used to help visualize the direction and speed of the flow, but it’s pure speculation!

How are you mapping the foam texture? Are you just offsetting the UV coordinates by the flow speed x delta time?

]]> By: e-dog https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-71 e-dog Mon, 27 Feb 2012 17:09:08 +0000 http://ranmantaru.com/?p=155#comment-71 It's CPU-based grid processing algorithm. Each grid cell has water amount (height), flow speeds (x/z) and foam amount. Amount of water is defined in the cell center, while flows are on the (positive direction) edges. So each cell has 4 flows for each edge, but 2 of them are shared with neighbors. Basically, the flows are accelerated with gravity, and then water is transferred out of the cell to neighbors based on the flows. It’s CPU-based grid processing algorithm.
Each grid cell has water amount (height), flow speeds (x/z) and foam amount.
Amount of water is defined in the cell center, while flows are on the (positive direction) edges.
So each cell has 4 flows for each edge, but 2 of them are shared with neighbors.

Basically, the flows are accelerated with gravity, and then water is transferred out of the cell to neighbors based on the flows.

]]> By: Reload https://ranmantaru.com/blog/2011/12/26/water-simulation-in-arcane-worlds/#comment-70 Reload Mon, 27 Feb 2012 15:39:57 +0000 http://ranmantaru.com/?p=155#comment-70 Hi! I am very impressed by your technical demo and very interested by your technical posts... I am working on a similar pet project and have wanted to implement a water simulation like yours. So I'll be very interested by a post on your water simulation implementation. Please ! :-) Is it based on the technique you described in your erosion post? Is it GPU based? (I don't think so, by the way the CPU usage evolves when adding water in the demo). Anything you might say regarding the technique you developped would be great to read! Oh, I forgot : Well done! Hi!

I am very impressed by your technical demo and very interested by your technical posts…

I am working on a similar pet project and have wanted to implement a water simulation like yours. So I’ll be very interested by a post on your water simulation implementation. Please ! :-)

Is it based on the technique you described in your erosion post? Is it GPU based? (I don’t think so, by the way the CPU usage evolves when adding water in the demo). Anything you might say regarding the technique you developped would be great to read!

Oh, I forgot : Well done!

]]>